GDX-350 Sensor Transmitter Instruction 5600-9001 Installation • Operation • Maintenance Rev.
GDX-350 Sensor Transmitter WARRANTY Bacharach, Inc. warrants to Buyer that at the time of delivery this Product will be free from defects in material and manufacture and will conform substantially to Bacharach Inc.'s applicable specifications. Bacharach's liability and Buyer's remedy under this warranty are limited to the repair or replacement, at Bacharach's option, of this Product or parts thereof returned to Seller at the factory of manufacture and shown to Bacharach Inc.
GDX-350 Sensor Transmitter TABLE OF CONTENTS 1. OVERVIEW ........................................................................................................................................... 5 1.1. Stand-alone and Wired Networks ............................................................................................ 5 1.2. RF Wireless Networks ............................................................................................................. 6 1.3.
GDX-350 Sensor Transmitter 5.13. 5.14. 5.15. 5.16. 6. Diagnostics ............................................................................................................................ 44 RS-485/Modbus Setup........................................................................................................... 44 Modbus Register and Function Code Summary .................................................................... 45 System Security .........................................................
GDX-350 Sensor Transmitter 1. OVERVIEW 1.1. Stand-alone and Wired Networks The GDX-350 is a fixed-point monitor designed to provide continuous monitoring of hazardous gases in the workplace. Monitored values are displayed in their engineering units as well as graphically such as bar graphs or 30-minute trends (see Figure 1-1).
GDX-350 Sensor Transmitter 1.2. RF Wireless Networks IMPORTANT: This section describes GDX-350 RF toxic / oxygen monitors equipped with the RF Wireless Interface and RF firmware. This battery powered device has no external power or signal wiring and is limited to self powered electrochemical sensors for toxic and oxygen measurements. Gas values are displayed in their engineering units as well as graphically as bar graphs or 30-minute trends.
GDX-350 Sensor Transmitter Figure 1-2: Data Displays (RF Version) SHOWING Radio Status 1.3. The RF Transmitter and Client/Server Wireless Networks Wireless transceivers utilize a FHSS (Frequency Hopping Spread Spectrum) Server-Client network where multiple clients synchronize their frequency hopping to a single server. The Server transmits a beacon at the beginning of every frequency hop (50 times per second).
GDX-350 Sensor Transmitter 1.3.2 RF Comm Cycle and Conserving Battery Life Most of the GDX-350’s battery power is consumed as the radio communicates to the wireless network. Each Comm cycle consists of the following operations: Awake the radio in receive mode; listen for the ”; transmit data Server’s beacon; synchronize to the Server’s hopping frequency to become “In Range packet out the antenna and return to sleep mode. This sequence takes from 0.25 to 1 second to complete.
GDX-350 Sensor Transmitter Figure 1-3: Battery I/O PCB 1.3.4 900 MHz RF Module The RF-equipped GDX-350’s RF module mounts “piggy back” to the back of the Display assembly as shown in Figure 1-4. The MMCX RF connector connects to the antenna fitting’s pigtail coax cable. There is also a slender 4 conductor cable between the RF Module PCB and the battery I/O PCB bolted to the bottom of the enclosure.
GDX-350 Sensor Transmitter 1.4. Safety Information – Read Before Installation and Applying Power IMPORTANT: Users should have a detailed understanding of GDX-350 operating and maintenance instructions. Use the GDX-350 only as specified in this manual otherwise the detection of gases and resulting protection provided may be impaired. Read the following WARNINGS prior to use. WARNING: Calibrate with known target gas at start-up and check on a regular schedule, at least every 90 days.
GDX-350 Sensor Transmitter 1.5. Ordering Information Transmitter Description Part Number 5600-301x GDX-350 CO 5601-301x 5600-302x GDX-350 H2S 5601-302x 5600-303x GDX-350 O2 5601-303x 5600-304x GDX-350 NO2 5601-304x 5600-305x GDX-350 NH3 5601-305x 5600-306x GDX-350 SO2 5601-306x P/N: 5600-9001 Rev 2 Options x=1 3-wire base w/ 4-20 mA output x=2 3-wire base w/ 4-20 mA output and Modbus x=1 2-wire base x=8 2-wire base w/ 900 MHz wireless x=9 2-wire base w/ 2.
GDX-350 Sensor Transmitter Transmitter Description Part Number 5600-307x GDX-350 PH3 5601-307x 5600-311x GDX-350 H2 5601-311x GDX-350 CH4 (Catalytic) 5600-320x GDX-350 CH4 (IR) 5600-321x GDX-350 CO2 5600-322x GDX-350 C3H3 (IR) 5600-323x 12 Options x=1 3-wire base w/ 4-20 mA output x=2 3-wire base w/ 4-20 mA output and Modbus x=1 2-wire base x=8 2-wire base w/ 900 MHz wireless x=9 2-wire base w/ 2.
GDX-350 Sensor Transmitter 1.6.
GDX-350 Sensor Transmitter 1.7. Calibration Gas Part Number 1.8. Gas Name Chemical Formula Concentration 0051-4000 Ammonia NH3 25 PPM 0051-4028 Propane C3H8 25% LEL 0051-4031 Methane CH4 25% LEL 0051-4010 Carbon Dioxide CO2 2.50% 0051-4052 Phosphine PH3 1 PPM 0051-4040 Hydrogen H2 0051-4048 Nitrogen Dioxide NO2 5 PPM 0051-4075 Sulfur Dioxide SO2 5 PPM 0051-4044 Hydrogen Sulfide H2S 25 PPM 0051-4049 Oxygen O2 20.
GDX-350 Sensor Transmitter 1.9. General Specifications Category General Specifications Product Type GDX-350 transmitter/monitor for various gases. Coverage Single sensor, 40 foot diameter 5 Indicator lights; AL1, AL2, Fail, In Cal, and RS-485 TXD and RXD Front Panel 64 x 128 Pixel LCD graphic display for gas readings, 30 minute trend, bar graphing, engineering units, and backlight Housing Instrument enclosure suitable for Class 1, Div 1 and 2, Gr.
GDX-350 Sensor Transmitter 16 Gas Sensor Measuring Range Sensor Type Display Resolution Default Span Point Default Low Alarm Default High Alarm Response Time (T90) 1.10. Sensor Specifications CO 0-1000 ppm EC 1 ppm 100 ppm 35 ppm 70 ppm <50 s O2 0-25% EC 0.1% 20.9% 19.5% 18.5% <30 s H2S 0-500 ppm EC 1 ppm 25 ppm 10 ppm 20 ppm <75 s SO2 0-99.9 ppm EC 0.1 ppm 5.0 ppm 2.0 ppm 4.0 ppm <45 s NO2 0-99.9 ppm EC 0.1 ppm 5.0 ppm 1.0 ppm 2.
GDX-350 Sensor Transmitter 2. INSTALLATION INSTRUCTIONS 2.1. Sensor Location Factors such as air movement, gas density in relation to air, emission sources and environmental variables affect correct sensor location. Air movement by fans, prevailing winds and convection should be carefully evaluated to determine if a leak is more likely to raise gas levels in certain areas within the facility. Vapor density of a gas determines if it will rise or fall in air when there are no significant currents.
GDX-350 Sensor Transmitter Figure 2-2: Outline Drawing (Stand-alone and Wired Version) 2.2.2 RF Wireless Networks The standard enclosure for the RF version of the GDX-350 is a cast aluminum explosion-proof (NEMA 7) enclosure as shown in Figure 2-3. Modular design simplifies the installation. The RF antenna should typically be mounted with “line of site” access to the controller’s base station antenna.
GDX-350 Sensor Transmitter WARNING: Qualified personnel should perform the installation according to applicable electrical codes, regulations and safety standards. Ensure correct cabling and sealing fitting practices are implemented. Install the GDX-350 to a wall or bracket using the predrilled mounting flanges with I.D. 0.25 on 5.0 inch centers (Figure 2-3). CAUTION: The sensor head (not shown in Figure 2-3) should never be installed pointing upwards.
GDX-350 Sensor Transmitter Figure 2-5: Outline Drawing (RF Network Version) 2.3. Transmission Range: 4-20mA Signals The distance 4-20 mA signals can travel is dependent upon several factors including the cable gauge, DC power supply voltage level and input impedance of the receiving device. Note: GDX-350 Controllers have 4-20 mA input resistance of 100 ohms. 2.4.
GDX-350 Sensor Transmitter Example: The RF radio modem has the following parameters: • • • Maximum RF TX power setting = 30 dBm (1 Watt) RF RX sensitivity = -100 dBm (this is a constant) Antenna gain (standard equipped dipole) = 2.1dBi x 2 = 4.2dBi So the system operating margin is:30 - (-100) + 4.2 = 134.2 dBm This is enough to transmit 10 miles if freespace was the only loss in the system.
GDX-350 Sensor Transmitter 2.6. Water Proofing Antenna Connection Waterproof all outdoor coax connectors using a three layer sealing process of initial layer of adhesive PVC tape, followed by a second layer of self-vulcanizing weatherproofing tape such as 3M 23, with a final layer of adhesive PVC tape (see Figure 2-7). Figure 2-7: Water Proofing Antenna Connections 2.7.
GDX-350 Sensor Transmitter STEP 3-WIRE 4-20 mA MODE INSTALLATION 1. Unscrew the cover on the GDX-350 explosion-proof enclosure. 2. Loosen the 2 thumbscrews holding the display assembly in place and remove it (refer to Figure 2-8). A small ribbon cable is attached with sufficient length to allow access to the I/O PCB mounted in the bottom of the enclosure. 3. Power and signal connections are to TB2 where 24 VDC, Signal and Common wires must be connected.
GDX-350 Sensor Transmitter CAUTION: Alarm relays have dry contacts and power must be supplied from an external source. Contacts are rated for RESISTIVE loads. Inductive loads, such as contactor coils or motors, may cause contact arcing, which shortens life and emits RFI into the sensor signals. Use appropriate arcing snubbers and MOVs across inductive loads and keep wiring away from signal wires.
Figure 2-10: RS-485 Modbus Wiring GDX-350 Sensor Transmitter P/N: 5600-9001 Rev 2 25
GDX-350 Sensor Transmitter 2.10. Isolated 4-20 mA Output Option The optional Isolated 4-20 mA option (P/N 5600-0009) as shown in Figure 2-11 provides dual 4-20 mA outputs that are electrically isolated from sensor inputs and the 24 VDC power source. Each 4-20 mA output shares the same common terminal and are not isolated from one another. This board is “piggybacked” behind the Display Assembly (P/N 5600-0005) as seen in Figure 2-2.
GDX-350 Sensor Transmitter CAUTION: Smart sensor heads with electrochemical toxic/oxygen sensors must connect to S1 located on the back of the Display Assembly (P/N 5600-0005) as seen in Figure 2-2. Smart sensor heads with catalytic bead combustible sensors must connect to S1 located on the optional I/O PCB assembly (Figure 2-8). Smart Sensors are automatically recognized by the GDX-350.
GDX-350 Sensor Transmitter 3. INITIAL START-UP 3.1. Model Name When power is applied to the GDX-350 it will briefly show a 10-digit ASCII model and company name during start-up. The name can be edited in the Transmitter Configuration menu by editing the Model field. Figure 3-1 shows how to access the menu for setting the 10-digit ASCII model name which is displayed briefly after power is applied to the GDX-350 (RF shown).
GDX-350 Sensor Transmitter 4. OPERATING INSTRUCTIONS 4.1. Routine Sensor Calibrations Calibration is the most important function for ensuring correct operation of the GDX-350. The CAL MODE (flow chart shown in Figure 4-2) is designed to make calibration quick, easy and error free. The 4-20 mA output indicates CAL MODE by transmitting 1.5 mA for 3-wire installations. It then transmits 4 mA during the subsequent CAL PURGE delay to prevent external alarms during calibration.
GDX-350 Sensor Transmitter Follow these GDX-350 calibration guidelines: Calibration accuracy is only as good as the calibration gas accuracy. Bacharach, Inc. recommends calibration gases with NIST (National Institute of Standards and Technology) traceable accuracy to increase the validity of the calibration. Do not use a gas cylinder beyond its expiration date. Calibrate a new sensor before use. Allow the sensor to stabilize before starting calibration (approximately 5 minutes).
GDX-350 Sensor Transmitter 4.2. Alarm Operation GDX-350s have front panel LED indicators for Alarm 1, Alarm 2 and Alarm 3. An optional Relay/Modbus board (P/N 5600-0007) adds K1, K2, and K3 relays for these alarms. CAUTION: GDX-350 Alarm LED indicators function even without the presence of the 56000007 Relay option. With 3-Wire 4-20 mA operation, alarm LEDs flash when new and becomes steady after the operator selects ACKNOWLEDGE by pressing the UP/RESET key. 4.3.
Figure 4-2: Cal-Mode Flow Chart and Menus GDX-350 Sensor Transmitter 32 P/N: 5600-9001 Rev 2
GDX-350 Sensor Transmitter 5. SETUP MENU CONFIGURATION 5.1. Menus Database Configuration All GDX-350 configuration variables are stored in its menu database. Many menu items will contain default values from the factory and require changes to better match a user’s particular application. GDX-350 menus may be configured from the magnetic keypad. The GDX-350’s configuration menus are shown below.
GDX-350 Sensor Transmitter Figure 5-2: Configuration Menu Tree (RF Model) 34 P/N: 5600-9001 Rev 2
GDX-350 Sensor Transmitter 5.2. Configuration Using the Magnetic Wand Passing the magnetic wand past the EDIT key from either data display screen displays SETUP PAGE 1 as shown in Figure 5-3. The UP/DOWN keys maneuver the pointer while EDIT enters sub-levels of menu items. All SETUP menu items have at least one page of sub-menus. Items with sub-menus are indicated by the > symbol (right arrow) at the end of each line.
GDX-350 Sensor Transmitter Menu Item Description Span (100%) Defines the reading to be displayed when 20 mA (100%) is the GDX-350 output. The highest reading allowed is 9999. Included is a negative polarity sign and one decimal point. Polarity is only indicated for negative readings. Decimal Points Sets the resolution of the LCD readings and may be for 0, 1 or 2. Example: ZERO readings for 0, 1, and 2 DPs respectively are 0, 0.0, and 0.00.
GDX-350 Sensor Transmitter Menu Item Description TX Sensor Life (Default is set for YES) Causes the GDX-350 4-20 mA output to transmit a sensor life value after successful calibrations during the CAL PURGE delay (see Section 4.1 on page 29). Normal operation is such that the GDX-350 transmits 4 mA during the CAL PURGE delay.
GDX-350 Sensor Transmitter Alarm 1, 2, 3 menus are identical A L A RM Al a Al a Al a Re l Al a r r r a r m m m ys m S E T T I N GS 1 2 3/ Fai l Co n f i g .
GDX-350 Sensor Transmitter 5.5. Relay Configuration (If Equipped) Relay Config has the submenu shown in Figure 5-8. The optional relay PCB must be installed to access this menu or a “HARDWARE NOT PRESENT” message appears.
GDX-350 Sensor Transmitter Menu Item Description Install New Sensor Should always be performed when a new simple sensor is installed. This deletes historical CAL data and sets sensor life to 100% after initial calibration of the new simple sensor. The GDX-350 Smart sensor interface will automatically detect new smart sensors and this menu is therefore not available with a smart sensor connected. Recall Cal History Recalls each successful calibration.
GDX-350 Sensor Transmitter Menu Item Hop Channel Description May be set from 1-32 and assigns the pseudo-random radio frequency hopping pattern. A transceiver will not go In Range of or communicate with a transceiver operating on a different Hop Channel. Different hop channels can be used to prevent radios in one network from listening to transmissions of another. Installations having more than one Server network should also have different hop channels for each network. 2.
GDX-350 Sensor Transmitter Menu Item Description Radio Status Opens another screen that shows if the RF GDX-350 is In Range of the Server and what the battery voltage is. Battery voltage is also displayed on the “EC INPUT PG. 2” screen. * TX Multiples RF Handshaking Menu settings are available to improve communications reliability by increasing the quantity and power of wireless transmissions.
GDX-350 Sensor Transmitter GDA-400 base stations must have their Communications menus set for Wireless Receiver mode as shown in Figure 5-12. In Receiver mode the GDA-400 may have 1-4 channels configured to receive input data from 1-4 GDX-350 sensor transmitters. Channel input type is configured in the ANALOG SETUP menu located within the Input/Output Setup menus as shown in Figure 5-13.
GDX-350 Sensor Transmitter 5.12. HELP Screen The HELP screen contains several pages of information describing how to operate the GDX-350. This is the bottom menu on page 1 of the SETUP screen. 5.13. Diagnostics IMPORTANT: Gas monitoring and alarm processing are not performed while using the Diagnostics menus. Access requires a special key sequence of four consecutive UP keystrokes. There are two Diagnostics menus useful for driving outputs without exposing the sensor to the target gas.
GDX-350 Sensor Transmitter 5.15. Modbus Register and Function Code Summary The following tables identify GDX-350 Modbus register locations and function codes. “Chan 1” designations represent the EC channel while “Chan 2” represents the LEL/4-20 mA Input channel.
GDX-350 Sensor Transmitter 3 16-bit status words; bit assignment for each channel. See below. ALARM1_BELOW BIT0 ALARM2_BELOW BIT1 ALARM3_BELOW BIT2 ALARM1_LATCH BIT3 ALARM2_LATCH BIT4 ALARM3_LATCH BIT5 ALARM3_ACTIVE BIT6 CHANNEL_DISABLED BIT7 CHANNEL_CAL BIT8 CHANNEL_LINEARIZE BIT9 FAULT_RELAY_LATCH BIT10 DISPLAY_NEGATIVE BIT11 TRANSMIT SENSOR LIFE ENABLED BIT12 4 16-bit status word; bit assignment for system status. See below.
GDX-350 Sensor Transmitter Memory ASCII Strings VARIABLE User Info Chan 1 1 User Info Chan 2 1 40401-40408 3 NA 3 NA 40417-40419 3 NA 2 40420-40422 3 NA EUNITS Chan 1 3 40423-40427 3 NA EUNITS Chan 2 3 40428-40432 3 NA 16 ASCII characters (2 per register) assigned to the unit identifier read as bytes. 6 ASCII characters (2 per register) reflecting the display readout. 10 ASCII characters (2 per register) assigned to the engineering units read as bytes.
GDX-350 Sensor Transmitter VARIABLE ALIAS READ FUNCTION CODE WRITE FUNCTION CODE Chan 1 Alarm 2 Real 41013 4 NA Chan 1 Alarm 2 Divisor 41014 4 NA Chan 1 Alarm 3 Real 41015 4 NA Chan 1 Alarm 3 Divisor 41016 4 NA Chan 1 Manual Gain Real 41017 4 NA Chan 1 Manual Gain Divisor 41018 4 NA Chan 1 Manual Offset Real 41019 4 NA Chan 1 Manual Offset Divisor 41020 4 NA Chan 2 Cal Zero Real 41021 4 NA Chan 2 Cal Zero Divisor 41022 4 NA Chan 2 Cal Span Real 41023 4 NA Chan
GDX-350 Sensor Transmitter Binary Cal Data VARIABLE ALIAS READ FUNCTION CODE WRITE FUNCTION CODE Chan 1 A2D MIN 41041 4 NA Chan 1 A2D MAX 41042 4 NA Chan 1 D2A MIN 41043 4 NA Chan 1 D2A MAX 41044 4 NA Chan 2 A2D MIN 41045 4 NA Chan 2 A2D MAX 41046 4 NA Chan 2 D2A MIN 41047 4 NA Chan 2 D2A MAX 41048 4 NA 1 Min and Max calibration points for the A/D and D/A converters. 5.16. System Security The SYSTEM SECURITY menu offers two levels of protection.
GDX-350 Sensor Transmitter Headquarters: 621 Hunt Valley Circle, New Kensington, PA 15068-7074 Toll Free: 800-736-4666 • Tel: +1-724-334-5000 • FAX: +1-724-334-5001 Website: www.MyBacharach.com • E-mail: help@MyBacharach.com Printed in U.S.A. 50 ® Registered Trademark of Bacharach Inc.
