INSTRUCTION MANUAL 121 INDICATOR TABLE OF CONTENTS 1. DESCRIPTION 1.1 Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.2 Unit Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2. INSTALLATION 2.
6.4.6 SETUP INDICATORS (Rate)............................................................................................... 25 6.4.7 SETUP INDICATORS (Temperature).................................................................................. 25 6.4.8 SETUP FLOW INPUT (Pulse - Ain & PS (A=B)).............................................................. 26 6.4.9 SETUP FLOW INPUT (Pulse - Quadrature, Qx1 or Qx2).................................................. 27 6.4.10 SETUP FLOW INPUT (Analog)........
8.2.18 Pulse input test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2.19 Analog out test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2.20 Excitation out test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 8.2.21 Pulse out test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Description 1. Description 1.1 Unit Description: The Max Model 121 Flow Computer satisfies the instrument requirements for a variety of flowmeter types in liquid applications. Multiple flow equations and instrument functions are available in a single unit with many advanced features. The alphanumeric display shows measured and calculated parameters in an easy to understand format. Single key direct access to measurements and display scrolling is supported.
Specifications Specifications: Environmental Indoor Use Altitude up to 2000m Operating Temperature: 0C to +50C Storage Temperature: -40C to +85C Maximum Relative Humidity : 80% for temperatures up to 31C decreasing linearly to 50% RH at 40C Main supply voltage fluctuations not to exceed ±10% of the nominal voltage Transient overvoltage according to INSTALLATION CATEGORY II (see UL 3101-1 Annex J) POLLUTION DEGREE 2 in accordance with IEC 664 (see 3.7.
Specifications Pulse Inputs: Isolated Pulse output Number of Flow Inputs: one The isolated pulse output is menu assignable to Configurations supported: single input with or Uncompensated Volume Total, Compensated without quadrature (menu selectable) Volume Total or Mass Total.
Specifications comparison is now made by comparing the current flow rates against the specified hi and low limits. Step 7: Compute the Analog Output-This designated flow rate value is now used to compute the analog output. Step 8: Compute the Flow Totals by Summation-A flow total increment is computed for each flow rate. This increment is computed by multiplying the respective flow rate by a time base scaler and then summing. The totalizer format also includes provisions for total rollover.
Specifications quality, calibration, and maintenance personnel will find this mode of operation very useful. It is also useful for factory testing. Many of these tests may be used during start-up of a new system. Inputs signals may be read, and output signals may be exercised to verify the electrical interconnects before the entire system is put on line.
Installation 2.1 General Mounting Hints: The 121 Series Flow Computer should be located in an area with a clean, dry atmosphere which is relatively free of shock and vibration. The unit is installed in a 5.43" (138mm) wide by 2.68" (68mm) high panel cutout. (see Mounting Dimensions) To mount the Flow Computer, proceed as follows: Mounting Procedure: a. Prepare the panel opening. b. Slide the unit through the bezel adaptor and gasket. c. Push the unit through the panel cutout until it touches the panel. d.
Applications 3. Applications 3.1 Liquid Volume Measurements: A flowmeter measures the actual volume in a liquid line. A temperature sensor can also be installed to correct for liquid thermal expansion (see 3.2 Corrected Volume). Calculations: • For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter frequency output and the user entered K-Factor.
Corrected Liquid Volume 3.2 Corrected Liquid Volume Measurements: A flowmeter measures the actual volume in a liquid line. A temperature sensor is installed to correct for liquid thermal expansion. Calculations: • Corrected Volume is calculated using the flow and temperature inputs as well as the thermal expansion coefficient stored in the flow computer. Use the "SET FLUID PROPERTIES" submenu to define reference temperature and density values for standard conditions.
Liquid Mass 3.3 Liquid Mass Measurements: Actual volume is measured by the flow element (DP transmitter, Flowmeter). Temperature is measured by the temperature transmitter. A density transmitter can be used for direct density measurements.
Batching 3.4 Batching Measurements: A flowmeter measures the actual volume in a liquid line. A temperature sensor can also be installed to correct for liquid thermal expansion (see 3.2 Corrected Volume). Calculations: • For Flowmeters with Pulse Outputs, Volume flow is calculated using the flowmeter frequency output and the user entered K-Factor. • For Flowmeters with Analog Transmitters, Volume flow is calculated using the measured flowmeter signal and the user entered scale settings.
Wiring 4 WIRING 4.1 Typical Batcher Wiring: Batcher Wiring For Model 121-500 Indicators, please refer to drawing #121-500-200, on page 67, for interface cable pin information 4.2 Typical Rate/Total Wiring: Rate / Total Wiring Pg 14 121-000-350 © 2001 Max Machinery, Inc.
Unit Operation 5. UNIT OPERATION 5.1 Front Panel Operation Concept for Run Mode The 121 Series is fully programmable through the front panel. Please review the following usage summary before attempting to use the instrument. HELP On-line help is provided to assist the operator in using this product. The help is available during RUN and SETUP modes simply by pressing the HELP key. The HELP key is used to enter decimals when entering numeric values.
General Operation 5.2 General Operation The unit can display: Rate, Total, Grand Total, Temperature, Density, Presets and Time of Day. The Temperature and/or Density can be displayed even if you are using the Volumetric Flow Equation (a Temperature or Density sensor must be installed). The unit can perform Mass or Corrected Volume equations using a temperature or density sensor (these equations can be computed without Temp/Dens sensors by using user defined default values).
General Operation Operation of RS-232 Serial Port with Printers: Transaction Printing For transaction printing, the user defines the items to be included in the printed document (see section 6.3.20 SET DATA OUTPUT, Select_list). The transaction document can be initiated by pressing the PRINT key or by a remote contact closure. Data Logging In data logging, the user defines the items to be included in each data log (see section 6.3.20 SET PRINTER OUTPUT, Select_list).
General Operation Time Delay The Time Delay for Auto Batch Restart functions as follows: When a batch is completed, the next batch will automatically start after the amount of time entered here. This time can be set from 1 to 99 seconds. Flow Signal Timeout The Flow Signal Timeout allows the user to enter a timeout of 0 to 99 seconds. If a batch is “Filling” and zero flow persists for more than the user entered time then the batch will be aborted.
General Operations 5.4.4 Pulse Output in Batcher mode The isolated pulse output (open collector) is menu assignable to Volume Total, Corrected Volume Total or Mass Total. The pulse output duration can be set for 10mS (50 Hz max) or 100mS (5 Hz max). A pulse output scale factor (pulse value) can be set to scale the pulse output. The pulse output is ideal for connecting to remote totalizers or other devices such as a PLC. See section 1.3 for electrical specifications. 5.4.
General Operations 6. PROGRAMMING 6.1 Front Panel Operation Concept for Program Mode The 121 Series may be fully programmable through the front panel. Please review the following usage summary before attempting to use the instrument. Setup Mode: MODE CHANGES Pressing the MENU key will offer selections of RUN, SETUP, TEST. RUN is the normal operating mode for the instrument. SETUP offers various sub-menus used for instrument setup. TEST offers various sub-menus for Test, Calibration and System Start-up.
6.2 EZ Setup The EZ Setup routine is a quick and easy way to configure the unit for the most commonly used instrument functions. This setup assumes that you are measuring Volumetric Flow. Entering the EZ Setup mode automatically sets many features. This may cause any previously programmed information to be lost or reset. For a complete customized configuration, see sections 6.3 and 6.4. 6.2.1 TOP LEVEL SETUP MENU 6.2.
TOP LEVEL SETUP MENU 6.3.2 EZ Setup Submenu Groups SELECT OPERATE STATE Run Setup Test MENU START Select Setup to enter the instrument setup routine. ENTER SELECT EZ SETUP Refer to Page 21 for Details. STOP START INSTRUMENT TYPE Refer to Page 23 for Details. STOP START SELECT FLOW EQUATION Refer to Pages 24 for Details. STOP START SETUP INDICATORS Refer to Page 24 & 25 for Details. STOP START SETUP FLOW INPUT Refer to Page 26, 27 & 28 for Details.
6.4.1 SELECT EZ SETUP SELECT EZ SETUP STOP START Advance To INSTRUMENT TYPE 6.4.2 INSTRUMENT TYPE Rate/Tot INSTRUMENT TYPE INSTRUMENT TYPE Rate/Tot Batch STOP Refer to page 21 for EZ Setup routine. Press the DOWN (stop) key to advance to Instrument Type. Press the UP (start) key to advance to Administrative Setup. Press ENTER to enter Instrument Type submenus. Press ENTER when Rate/Total is flashing to configure the instrument as a Ratemeter/Totalizer.
6.4.3 SELECT FLOW EQUATION SELECT FLOW EQUATION Press ENTER to enter Select Flow Equation submenus. ENTER SELECT FLOW EQUATION Volume Mass Cor/Vol Press ENTER when desired flow equation is flashing. ENTER Advance To SETUP INDICATORS (Total) 6.4.
6.4.6 SETUP INDICATORS (Rate) SETUP INDICATORS Total Dens Rate Temp Press ENTER when Rate is flashing to configure the Ratemeter Indicators ENTER RATE time base Sec Min Hour Select the desired Rate Time Base. Day ENTER RATE DESCRIPTOR RATE Enter the desired Descriptor for the Ratemeter. ENTER RATE Dec places 0 Select the desired Rate Decimal Place. 0-3 decimal places allowed. ENTER RATE Avg filter Enter desired Rate Averaging Filter.
6.4.8 SETUP FLOW INPUT (Pulse - Ain & PS (A=B)) SETUP FLOW INPUT Press ENTER to begin setup of Flow Input. ENTER EXCITATION VOLTAGE 5v 12v 24v Select the desired Excitation Voltage. ENTER FLOW INPUT TYPE Pulse Analog Press ENTER when Pulse is flashing to configure the flow input for Pulse signals. ENTER NOTE: Ain = Single Pulse PS(A=B) = Pulse Security Qx1 = Quadrature Qx2 = Quadrature x 2 PULSE INPUT TYPE Ain PS(A=B) Qx1 Qx2 Enter the desired Pulse type. See side note.
SETUP FLOW INPUT (Pulse - Quadrature, Qx1 or Qx2) NOTE: Ain = Single Pulse PS(A=B) = Pulse Security Qx1 = Quadrature Qx2 = Quadrature x 2 EXCITATION VOLTAGE 5v 12v 24v Select the desired Excitation Voltage. FLOW INPUT TYPE Pulse Analog Press ENTER when Pulse is flashing to configure the flow input for Pulse signals. PULSE INPUT TYPE Ain PS(A=B) Qx1 Qx2 Enter the desired Pulse type. See side note. PULSE TRIGGER LEVEL 10mV 100mV 2.5V Select the desired Input Pulse Trigger Level.
6.4.10 SETUP FLOW INPUT (Analog) SETUP FLOW INPUTS Press ENTER to begin setup of the Flow Input. ENTER EXCITATION VOLTAGE 5v 12v 24v Select the desired Excitation Voltage. ENTER FLOW INPUT TYPE Pulse Analog Press ENTER when Analog is flashing to configure the flow input for Analog signals . ENTER ANALOG SIGNAL TYPE Voltage Current Choose Analog Signal Type. ENTER ANALOG VOLTAGE RANGE 0-10V 0-5V 1-5V If Voltage selected, Choose desired Voltage Range.
6.4.11 SETUPAUX INPUT SETUP AUX INPUT Press ENTER to begin setup of the Auxiliary Input. ENTER AUX INPUT TYPE None Dens Temp Select Temperature to set the Auxiliary Input for Temperature inputs. ENTER NOTE: When Density (Dens) is selected, The menu prompts will be very similar to the Temperature prompts. The menus will prompt the user for density values and density units. AUX SIGNAL TYPE Voltage Current RTD Choose Temperature Signal Type. Advance to "Aux Default", if RTD selected.
6.4.12 SET FLUID PROPERTIES SET FLUID PROPERTIES ENTER REF. DENSITY ###### lbs/g ENTER REF. TEMPERATURE ###### F Press ENTER at this prompt to Set Fluid Properties. Enter the Reference Density. This is used in the calculation of density when you have a temp transmitter and used for corrected flow calculation if you have a density transmitter. Enter the Reference Temperature. ENTER EXPAN. FACTOR [xe-6] ######## ENTER CALIBRATION DENSITY ######## Enter the proper Expansion Factor.
6.4.14 SETUP ANALOG OUTPUT SETUPANALOG OUTPUT Press ENTER when Analog is flashing to setup the Analog Output. ENTER ANALOG OUTPUT USAGE Rate Total Temp Dens Select the desired Analog Output Usage. ENTER ANALOG OUTFLOW TYPE Vol CVol/Mass Only if Rate selected & Flow EQ. = Mass, Cor/Vol Select the desired Analog Output Flow. ENTER ANALOG OUTPUT RANGE 4-20mA 0-20mA Select the desired current range for the Analog Output.
RELAY NOTES & CONSIDERATIONS 1. Relay activation is based on the computed readings not the displayed value. Therefore the display damping factor will not affect the relay response time. The RELAY DELAY feature allows the user to enter a time delay for relay activation. This feature is very useful in applications where short over/under range conditions are not considered alarm conditions. 2. When INSTRUMENT TYPE is set to batcher, Relay 1 is reserved for PRESET and Relay 2 is reserved for PREWARN.
6.4.16 SETUP CONTROL INPUTS (RATE/TOTAL) SETUP CONTROL INPUTS Press Enter to begin setup of the Control Inputs. ENTER SETUP CONTROL INPUTS Input1 Input2 Input3 Select the desired Control Input for setup. ENTER CONTROL INPUT1 USAGE INHIBIT_TOTAL NA If Control Input 1 Selected, Select Inhibit Total or NA (Not Assigned). CONTROL INPUT2 USAGE RESET_TOTAL NA If Control Input 2 Selected, Select Reset Total or NA (Not Assigned).
6.4.18 SETUP REALTIME CLOCK (Time) SETUP REALTIME CLOCK Press Enter to begin setup of the Realtime Clock. ENTER SETUP REALTIME CLOCK Time Date Select Time to set the time. ENTER 6.4.19 SETUP REALTIME CLOCK (Date) CLOCK TYPE 24HR 12HR Select 24Hr or 12Hr clock ENTER SELECT CLOCK AM/PM AM PM If 12Hr Clock, Enter AM or PM ENTER TIME OF DAY HH:MM:SS ##:##:## Enter time of day. ENTER Advance To SETUP REALTIME CLOCK (Date) SETUP REALTIME CLOCK Time Date Select Date to enter the date.
6.4.20 SERIAL USAGE SERIAL USAGE Press Enter to begin setup of the Serial Port. ENTER SERIAL HARDWARE RS232 RS485 Select Serial Hardware type for standard port. ENTER Select the Device ID. DEVICE ID ## ENTER BAUD RATE 300 600 1200 BAUD RATE 2400 4800 9600 19200 Select the desired Baud Rate. (If selected) ENTER PARITY None Odd Select the desired Parity. Even ENTER HANDSHAKING None Softwre Hardwre Set the Handshake.
6.4.20 SERIAL USAGE (continued) CALL ON ERROR/ALARM No Yes Select "Yes" to have the unit perform a Call Out transmission upon error/alarm condition. ENTER NUMBER OF REDIALS 0 ENTER HANGUP IF 2MIN INACT No Yes Enter the number of redials to be performed on call out time if busy or no answer. (error/alarm tries until connected) Select "Yes" to perform hangup if there is inactivity for more than 2 minutes. ENTER Advance To SETUP DATALOG/PRINT 6.4.
6.4.22 SETUP DATALOG/PRINT (Select_list) STOP START List Items: Total Rate Pre1 temp grand pre2 dens time 6.4.23 ADMINISTRATIVE SETUP SET DATALOG/PRINT Press enter to begin Setup Datalog/Print routine. ENTER SET DATALOG/PRINT Config Select_list Press enter when Select_list is selected to setup print list. PRINT LIST ITEMS TOTAL YES Use Up and Down arrow keys to view list status. Press the Corresponding function key to the items that you wish to add or remove from the list.
6.4.24 SETUP NETWORK CARD (optional) SETUP NETWORK CARD Press Enter to setup Network Card ENTER SELECT NTW PROTOCOL ModbusRTU Select desired Network Protocol. ENTER NETWORK DEVICE ID 1 Enter the device address on network (00-255). ENTER BAUD RATE 2400 4800 9600 19200 Select the desired Baud Rate. ENTER PARITY None Odd Select the desired Parity. Even ENTER Advance To SELECT EZ SETUP? Pg 38 121-000-350 © 2001 Max Machinery, Inc.
Principle Of Operation 7.1 General: General Operation The 121 Series Flow Computer uses several internal calculations to compute the compensated flow based on specific data input. Several computations are performed to arrive at the uncompensated flow, temperature, density and viscosity. This information is then used to compute the Corrected Volume Flow or Mass Flow. 7.
Corrected Volume Flow Computation: Temperature Transmitter Standard Volume Flow = volume flow • (1 - Therm.Exp.Coef. • (Tf-Tref))2 Density Transmitter Standard Volume Flow = volume flow • density reference density Mass Flow Computation: Mass Flow = volume flow • density Pg 40 121-000-350 © 2001 Max Machinery, Inc.
7.4 Calculating the Expansion Factor Calculating Expansion Factor Two temperature-specific gravity pairs will be required to compute the temperature coefficient. The reference temperature is simply chosen by the user. Common reference temperatures are 60 F or 15 C. The reference temperature should be chosen so that it is in the application temperature range. (ex. application temperature range -10 to 120 F, reference temperature of 60 F chosen.) Enter the reference temperature you have chosen at this point.
7.6 Linearization Table 7.6.1 Linearization Table General Information The Linearization Table is used when the flow input device gives a nonlinear input signal. The unit uses up to 16 different points, as entered by the operator, to form a curve for linearizing the input signal. Notes: 1) A minimum of three points must be set up. 2) If "0" is entered for the frequency of any point other than point 1, the Flow Computer assumes there are no more points above the points that preceded them.
8.1.1 TOP LEVEL TEST MENUS START SELECT OPERATE STATE Run Setup Test ENTER Select Test to enter the instrument test & calibration routine. NOTE: Supervisor (Service) password required to gain access to this mode. Refer to Page 44 for Details. Audit Trail ENTER Error history Refer to Page 44 for Details. ENTER Print System Setup Refer to Page 44 for Details. ENTER Keypad Test Refer to Page 45 Details. ENTER Display test Refer to Page 45 for Details. ENTER Refer to Pages 46 -50 for Details.
8.2.1 Audit Trail Submenu Group 8.2.2 Error History Submenu Group 8.2.3 Print System Setup Submenu Group Press Enter to view the audit trail information. Audit Trail ENTER Audit Trail hh:mm:ss nnnnn mm/dd/yy The audit trail is viewed in this format: nnnnn= number of critical menu changes, hh:mm:ss; mm/dd/yy = time and date of last change. ENTER Press Menu to get back to audit trail top-level menu. Audit Trail Error history ENTER Error history Flow rate alarm low Press Enter to view error history.
8.2.4 Keypad test Submenu Group Keypad test Press Enter to enter keypad test ENTER Keypad test Key pressed—> ENTER Press the various keys and the display will show the key that was pressed. Press Menu to exit the test ENTER 8.2.5 Display test Submenu Group Keypad test Press Menu to get back to Keypad test top-level menu. Display test Press Enter to enter display test. ENTER 00000000000000000000 00000000000000000000 Upon pressing enter each digit on the display will scroll 0-9 then A-Z.
ALL I/O REFERNCES ARE CALIBRATED AT THE FACTORY PRIOR TO SHIPMENT CAUTION: This unit must be calibrated using precision and calibrated equipment. Equipment needed is as follows: Frequency Generator, Digital Multimeter, Precision Current/Voltage Source, Oscilloscope, Frequency Counter. Calibration Submenu Group Press Enter to begin the calibration routine. (Please note the caution above) Calibrate ENTER 8.2.6 Calibrate CH1 0mA Submenu Group 8.2.
8.2.8 Calibrate CH2 0mA Submenu Group 8.2.9 Calibrate CH2 20mA Submenu Group Calibrate ch2 0mA Iin=TB1-8 GND=TB1-4 To Calibrate: Connect Current Source (+) TB1-8, (-) TB1-4. Input 0mA and press Enter. ENTER Calibrate ch2 0mA 0 CALIBRATING —— This message is displayed during calibration. Calibrate ch2 0mA *** DONE *** This message is displayed when the 0mA calibration is finished. Calibrate ch2 0mA Iin=TB1-8 GND=TB1-4 The display will automatically return to the Calibrate CH2 0mA submenu.
8.2.10 Calibrate CH1 0V Submenu Group Calibrate ch1 0V Vin=TB1-2 GND=TB1-4 ENTER Calibrate ch1 0V 0 CALIBRATING —— This message is displayed during calibration. Calibrate ch1 0V *** DONE *** This message is displayed when the 0V calibration is finished. Calibrate ch1 0V Iin=TB1-2 GND=TB1-4 The display will automatically return to the Calibrate CH1 0V submenu. Press the Down arrow key to advance to the CH1 10V calibration. STOP 8.2.
8.2.12 Calibrate CH2 0V Submenu Group Calibrate ch2 0V Vin=TB1-5 GND=TB1-4 ENTER Calibrate ch2 0V 0 CALIBRATING —— This message is displayed during calibration. Calibrate ch2 0V *** DONE *** This message is displayed when the 0V calibration is finished. Calibrate ch2 0V Iin=TB1-5 GND=TB1-4 The display will automatically return to the Calibrate CH2 0V top-level menu. Press the Down arrow key to advance to the CH2 10V calibration. STOP 8.2.
8.2.15 Calibrate 4mA Out Submenu Group 8.2.16 Calibrate 20mA Out Submenu Group 8.2.17 Analog In Test Submenu Group Calibrate 0mA out + TB1-15 - TB1-16 Connect ammeter to (+) TB1-15, (-) TB1-16. Press enter. ENTER Calibrate 0mA out Enter mA: 0.00000 ENTER Calibrate 0mAout + TB1-15 - TB1-16 STOP Calibrate 20mA out + TB1-15 - TB1-16 ENTER Calibrate 20mA out Enter mA: 20.00000 To trim 0mA output: Press CLEAR to enable editing and enter a small negative number (i.e. -0.
8.2.18 Pulse input test Submenu Group 2.5V 10mV 100mV Pulse input test Press Enter key to test the pulse input. ENTER START STOP Pulse input test Trigger level 2.5V Use the Up/Down arrow keys to select the appropriate trigger level. ENTER 40Hz 3KHz 20kHz START STOP Pulse input test count speed 3kHz Use the Up/Down arrow keys to select the appropriate frequency range. ENTER Pulse input test F1: 0 F2: 0 MENU 8.2.
8.2.21 Pulse out test Submenu Group Pulse out test ENTER Pulse out test *0Hz 1Hz 10Hz 20Hz MENU 8.2.22 Relay test Submenu Group To simulate a frequency on the pulse output: Connect a frequenc counter to (+)TB1-13, (-)TB1-14. Press the key under the desired setting to move the asterisk (*). The unit should output the selected frequency. Pulse out test Press Menu key to return to Pulse out test top-level menu. Relay Test Press Enter to test the relays.
8.2.24 Battery Voltage test Submenu Group Battery Voltage Test Press Enter key to view the battery voltage. ENTER Battery Voltage Test 3.312 Volts The display will show the battery voltage. Replace battery at 2.5 VDC or below. MENU 8.2.25 Data logger utility Submenu Group Battery Voltage Test Press Menu key to return to battery voltage test top-level menu. Data logger utility Press Enter to use data logger utility.
8.3 Internal Fuse Replacement Instructions: 1. Make sure you follow proper E.S.D. Precautions. All persons performing this replacement must follow proper grounding procedures. 2. Turn the power to the unit off. 3. Disconnect the two piece connector rear terminal block, leaving all connections in place. 4. Remove the unit from the panel. 5. Remove the four machine screws (see fig. 1) which hold the two sections of the case together. 6. The rear section of the case should detach from the rest of the case.
9. RS-232 Serial Port 9.1 RS-232 Port Description: The Model 121 Series has a general purpose RS-232 Port which may be used for any one of the following purposes: Transaction Printing Data Logging Remote Metering by Modem (optional) Computer Communication Link Configuration by Computer Print System Setup Print Calibration/Malfunction History 9.
11. Flow Computer Setup Software The Model 121 setup program provides for configuring, monitoring and controlling the indicator. Sample applications are stored in disk files. The setup program calls these Templates. You can store the setup from the program’s memory to either the Model 121 (Downloading the file) or to a disk file (Saving the file) for later usage. Similarly you can load the setup in program memory from either a disk file (Opening a file) or from the Model 121 unit (Uploading a file).
11.5 File Tab The File Tab has three sections. Any of the options on this tab can also be accessed from the File submenu. The Template Section provides for opening and saving templates. The Save and Save As buttons provide the standard Windows functionality for dealing with files. The Load button is used to open existing templates. There are two additional menu items available only from the File menu: Create new file and Templates.
11.7 View Tab The View Tab screen allows for viewing selected group items on the PC in a similar format as shown on the unit display. Data from the following groups can be viewed in the List of Values section: Process Parameters (i.e. rate, temperature) Totalizers (i.e. total, grand total) The setup software assumes the current setup has been uploaded from the flow computer into the PC.
12. Glossary Of Terms Acknowledge & Clear Alarms Acknowledge is used to clear alarm relays and remove any visual alarm messages from the display. In the run mode, press the ENTER key or activate CONTROL INPUT 3 (if set for ACK) to momentarily clear alarms and alarm messages. Alarms will reassert themselves if alarm conditions are still present. Analog Output The analog signal (4-20mA) that is generated by the Model 121. It can correspond to the Rate, Total, Temperature or Density.
12. Glossary Of Terms (Continued) Flow Signal Timeout The Flow Signal Timeout allows the user to enter a timeout of 0 to 99 seconds. If a batch is “Filling” and zero flow persists for more than the user entered time then the batch will be aborted. This prevents over flows due to faulty flow sensors and/or wiring. Flow Equation A flow control expression or algorithm describing a mathematical equation to be solved by a flow computer in the desired application.
12. Glossary Of Terms (Continued) Maximum Batch Preset The Maximum Batch Preset allows the user to program the Maximum Batch value allowed to be entered by the operator. If an operator should try to program a batch higher then this value, the unit will not allow the value to be entered and will prompt the user with an error message saying that the Maximum Batch Preset has been exceeded. Maximum Drain Time The unit declares that a batch is “done” when the flow rate equals “0”.
12. Glossary Of Terms (Continued) Quick Update % This feature is used to disable the rate averaging filter when a significant change in the flow rate occurs. The user can enter the percent of change needed to be detected to disable the averaging feature. This is especially useful during start-up and shutdown of flow. Rate Averaging Filter The rate averaging filter is used to stabilize fluctuating rate displays. Higher settings provide more averaging for a more stable display.
13. Diagnosis and Troubleshooting 13.1 Response of Model 121 on Error or Alarm: Error and warning indications which occur during operation are indicated in the RUN mode alternately with the measured values. The Model 121 Flow Computer has three types of error: TYPE OF ERROR Sensor/Process Alarms DESCRIPTION Errors detected due to sensor failure or process alarm conditions Self Test Errors Errors detected during self test.
13.2 Diagnosis Flow Chart and Troubleshooting A summary of possible causes is given below to help you identify faults. Is there an input power supply voltage across Terminals 23 and 24? No Yes Is the Display Backlight Visible? Check the connections according to the circuit diagrams. Check junction box fuses. No Check/Replace internal fuse. If fuse is OK, Factory Service Required.
13.2 Diagnosis Flow Chart and Troubleshooting 13.3.1 Sensor/Process Alarms Error/Warning Message Cause Remedy TOTALIZER ROLLOVER Displayed when totalizer rolls over Acknowledge Rollover, Remedy not required AUX INPUT TOO LOW 4-20 mA Input current at aux input smaller than 3.
13.2 Diagnosis Flow Chart and Troubleshooting 13.3.
