Detcon Model 1000 H2S Process Analyzer - Electrochemical Sensor PART NO. MODEL NO. SE RI AL NO. INPUT VOLTAGE FREQUE NCY CU RRE NT LOAD AREA CLASSIFICATION detcon inc. SAMPLE INLET SAMPLE OUTLET AIR INLET SAMPLE FLOW 3200 A-1 Research Forest Dr. The Woodlands, TX 77381 www.detcon.com AIR AIR FLOW SAMPLE PRESSURE 10 PSIG (CONSTANT) SAMPLE INLET Operator’s Installation and Instruction Manual Detcon Model 1000 Series H2S Analyzer consists of two major assemblies: 1.
Model 1000 H2S Echem This page left intentionally blank Model 1000 H2S Echem Instruction Manual ii
Model 1000 H2S Echem Table of Contents 1. Introduction ........................................................................................................................................ 1 DM-624 Sensor ............................................................................................................................... 1 Electrochemical Sensor.................................................................................................................... 2 Microprocessor Control Circuit.
Model 1000 H2S Echem Table of Figures Figure 1 DM-624 Sensor ................................................................................................................................ 1 Figure 2 Construction of Electrochemical Sensor............................................................................................ 2 Figure 3 Functional Block Diagram ................................................................................................................
Model 1000 H2S Echem 1. Introduction The Detcon Model 1000 Series H2S Process Analyzer is a 110/220VAC or 24VDC powered analyzer that provides a select gas sample mixture to an on-board DM-624 H2S gas sensor assembly. The range of gas analysis can span from 0-10ppm up to 0-5% (see Table 2 Sample Flow Rate). The range of analysis is determined at time of order. The NEMA 7X rating is achieved by housing all electronic components in suitable NEMA 7X enclosures.
Model 1000 H2S Echem Detcon MicroSafe™ Model DM-624, toxic sensors are non-intrusive “Smart” sensors designed to detect and monitor for H2S gas in the ppm range. A primary feature of the sensor is its method of automatic calibration, which guides the user through each step via instructions displayed on the backlit LCD. The sensor features field adjustable, fully programmable alarms and provides relays for two alarms plus fault as standard.
Model 1000 H2S Echem Figure 3 Functional Block Diagram Figure 4 DM-624 Control Circuit 1.4 Base Connector Board The base connector board is mounted in the explosion proof enclosure and includes: the mating connector for the control circuit, reverse input and secondary transient suppression, input filter, alarm relays, lugless terminals for all field wiring, and a terminal strip for storing unused programming jumper tabs.
Model 1000 H2S Echem 1.5 Interference Data DM-624 series electrochemical H2S sensors are subject to interference from other gases. This interaction is shown in the following table as the relation between the amount of the interfering gas applied to the sensor, and the corresponding reading that will occur (in ppm). Gas Carbon monoxide Chlorine Ethyl mercaptan Ethylene Hydrogen Hydrogen chloride Hydrogen cyanide Nitric oxide Nitrogen dioxide Sulfur dioxide Methyl mercaptan Interference 300ppm 1.
Model 1000 H2S Echem 2. Specifications Sensor Type Electrochemical cell Measurement Range 0-10ppm H2S, up to 0-5 % H2S Accuracy/Repeatability ±10% of reading or ±0.5ppm, whichever is greater Response/Clearing Time T80 < 1 minute Operating Temperature -40°F to +122°F: -40°C to +50°C Outputs Linear 4-20mA DC; RS-485 Modbus™; 3 relays (alarm 1, alarm 2, and fault), Contacts rated 5 amps Input Voltage 110~220VAC; 18~36VDC Power Consumption 700mA (16.
Model 1000 H2S Echem 3. Installation 3.1 Mounting Securely mount the Model 1000 analyzer panel or NEMA 4 enclosure (optional) in accordance with Figure 7. Figure 7 Unit Dimensions 3.2 Gas Connections and Sampling System Notes 1. Install a length of tubing from the desired sample point to the sample input port (as shown in Figure 8). Sample draw tubing should be 316 stainless steel of ¼" O.D. NOTE: A constant pressure of 10±2psig should be provided to the analyzer for proper operation.
Model 1000 H2S Echem PART NO. MOD EL N O. SERIAL N O. INPUT VOLTAGE F REQU EN CY CURRENT L OAD AREA CL ASSIFICATION det con inc. AIR INLET 3200 A-1 Research Forest Dr. The Woodlands, TX 77381 www.det con. com AIR SAMPLE FLOW AIR FLOW Cal Gas Pressure Gauge SAMPLE PRESSURE 10 PSIG (CONSTANT) SAMPLE INLET Sample Inlet Port Sample Calibrate NOTE: These may be combined into a single vent H2S Vent Sample Bypass and Liquid Rejection Exhaust Vent. Figure 8 Port Identification 2.
Model 1000 H2S Echem Air Inlet Port SAMPLE FLOW AIR FLOW Optional Acetic Acid Bubbler Bottle Pressure Guage Sample Inlet Port Sample Calibrate H2S Vent Port NOTE: These can be combined into a single Vent. Sample Bypass and Liquid Rejection Exhaust Vent. Over Pressure Relief Vent Figure 9 Optional Bubbler Bottle Model 1000 H2S Echem Instruction Manual Rev. 2.
Model 1000 H2S Echem 3.3 Electrical Connections Customer Connections INPUT + + 24VDC OUT 2.1A + 24VDC OUT 2.1A + 18-36 VDC IN 18-36 VDC IN + - +24VDC -24VDC (Ground) 117VAC / 24VDC In 4-20mA, RS485, Alarm/Fault Sensor Relays Low Flow Air/ Sample Relays (Optional) SAMPLE FLOW AIR FLOW Figure 10 Installation Wiring Connections 1. For AC powered unit connect 117/220VAC to the terminal connector labeled “VAC IN” ( JP8A) inside the explosion-proof enclosure on the upper right.
Model 1000 H2S Echem 3.4 Relays and RS-485 Setup Program the alarms via the gold plated jumper tab positions located on the CPU board (Figure 11). Alarm 1 and Alarm 2 have three jumper programmable functions: latching/non-latching relays, normally energized/normally de-energized relays, and ascending/descending alarm set points. The fault alarm has two jumper programmable functions: latching/non-latching relay, and normally energized/normally de-energized relay.
Model 1000 H2S Echem Table 1 Hexadecimal Conversion ID# none 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 SW1 SW2 0 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 A 0 B 0 C 0 D 0 E 0 F 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 1 A 1 B 1 C 1 D 1 E 1 F 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 2 A ID# 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 SW1 SW2 2 B 2 C
Model 1000 H2S Echem 4. Start Up Upon completion of all tubing connections and field wiring the Model 1000 Series Process Analyzer is ready for startup. Note that after power is applied, varying readings may occur during sensor warm-up. Allow at least 1 hour for stabilization (24 hours is best). With sample gas and air flowing, apply system power and observe the following normal conditions: a) DM-624 “Fault” LED’s are off.
Model 1000 H2S Echem 5. Operating Software 5.1 Programming Magnet Operating Instructions Operator interface to MicroSafe™ gas detection products is via magnetic switches located behind the transmitter faceplate. DO NOT remove the glass lens cover to calibrate or change programming parameters.
Model 1000 H2S Echem 5.2.2 Calibration Mode Calibration mode allows for sensor zero and span adjustments. It uses an “AUTO SPAN” sequence with built in diagnostics to ensure adequate sensor response and signal stability “1-ZERO 2-SPAN”. Zero Adjustment Zero is set with no H2S target gases present. “AUTO ZERO” Span Adjustment Span adjustment is performed with a target gas concentration of 10 ppm H2S in nitrogen. concentrations other than 10 ppm may be used “AUTO SPAN”. See Table 3 Sample Flow Rate. 5.2.
Model 1000 H2S Echem c) Exit back to normal operations by holding the programming magnet over “PGM 2” for 3 seconds, or, the sensor will automatically return to normal operation in 30 seconds. Alarm 1 Level Adjustment The alarm 1 level is adjustable over the range 10% to 90% of range. For hydrogen sulfide gas sensors, the level is factory set at 20% F.S. The menu item appears as: “SET ALM1 @ ### PPM”. Alarm 2 Level Adjustment The alarm 2 level is also adjustable over the range 10% to 90% of range.
Model 1000 H2S Echem 5.2.4 Software Flow Chart Figure 14 DM-624 Software Flow Chart 6. Calibration and Maintenance The Model 1000 Series H2S Process Analyzer is calibrated prior to shipment. Only minimal adjustment should be required at time of commissioning. However, it is highly recommended that a zero and span calibration be performed twice in the first week of operation to assure optimum system performance. After that, a recalibration interval of every month is recommended.
Model 1000 H2S Echem Material Requirements Detcon Part Number 327-000000-000 MicroSafe™ Programming Magnet. Detcon Part Number 942-001123-000 Zero Air cal gas. (Ambient air can be used, if it can be verified that no target gas is present). Span gas cylinder containing H2S gas in background N2 (nitrogen) as per the following range table. If available, span gas cylinders in background Methane (natural gas) or air can also be used. 6.1.
Model 1000 H2S Echem 1) Verify that the current calibration gas level is equal to the calibration span gas concentration. (Refer to Section 5.2.3 Program Mode, “View Sensor Status”. The item appears as “CAL LEVEL @ ### PPM”.) 2) If the calibration gas level setting is equal to the calibration span gas concentration, proceed to item “3)”.
Model 1000 H2S Echem c) After span calibration, the alarm relays remain inactive until the sample gas concentration falls below both set alarm levels. The alarms will then become active again. 7. Programming Alarms Both alarm 1 and alarm 2 levels are factory set prior to shipment. Alarm 1 is set at 20% of full-scale range; alarm 2 at 40% of full-scale range. Both alarms can be set from 10 to 90% of full-scale range.
Model 1000 H2S Echem Over Range When the sensor detects gas greater than 100% of its range, it will cause the display to flash the highest reading of its range on and off. Under Range Faults If the sensor should drift below the zero baseline by approximately 10% of range, the display will indicate a fault: “ZERO FAULT”. If the sensor drifts below the normal zero baseline by approximately -30% of range, the display will indicate a “SIGNAL FAULT”.
Model 1000 H2S Echem Sensor life is an estimated remaining use of the sensor head, between 0% and 100% Example: 85=85% sensor life Register # 40001 High Byte Detectable Low Byte Range i.e. 100 for 0-100 ppm, 50 for 0-50% LEL, etc Register # 40002 High Byte Low Byte Current Gas Reading The current gas reading as a whole number: If the reading is displayed as 23.5 on the display, this register would contain the number 235.
Model 1000 H2S Echem Start Address Lo No. of Registers Hi No.
Model 1000 H2S Echem 12. Sensor Replacement Should the electrochemical H2S plug-in sensor (part number 370-323200-000 or 370-3H3H00-000) require replacement, use the following procedure: 1 - (A) If the sensor is mounted in a classified area, system power to the transmitter must first be removed before proceeding further. (B) If in an unclassified area, remove front enclosure cover and unplug transmitter module. 2 - Remove gas flow adapter and tubing connections to expose sensor housing.
Model 1000 H2S Echem 14. Spare Parts Part# 327-000000-000 351-152021-400 360-2424AS-030 943-200000-000 360-205421-024 943-010013-505 823-101085-882 350-300000-000 348-900000-000 350-523081-02K 955-004229-000 Description Programming Magnet 24 VDC Pump Assembly 24V DC-DC Converter Activated Carbon Scrubber 24 VDC Power Supply 500 CC Fixed Flow Regulator Genie Membrane Filter 0.
Model 1000 H2S Echem Spare Parts DM-624 H2S Sensor Part# 942-010212-XXX 942-010213-XXX 926-245502-XXX 4040-H2S32-NXX 404-0H2S3H-NXX 017-501500-574 017-26530H-000 370-323200-000 370-3H3H00-000 Description Calibration Span Gas (XXXppm H2S, balance nitrogen) (Where XXX denotes the gas level – 010 = 10ppm, 025 = 25ppm, 050 = 50ppm) Calibration Span Gas (XXX% H2S, balance nitrogen) (Where XXX denotes the gas level – 001 = 1%, 1X5 = 1.5%, 2X5 = 2.
Model 1000 H2S Echem 15. Warranty Detcon Inc., as manufacturer, warrants under intended normal use each new Model 1000 Series H2S Process Analyzer gas detection system to be free from defects in material and workmanship for a period of one year from the date of shipment to the original purchaser. All warranties and service policies are FOB the Detcon Inc. facility located in The Woodlands, Texas. Sensor Transmitter Detcon, Inc.
Model 1000 H2S Echem 16. Flow Diagrams + 24VDC OUT 1.25A 10-30VDC IN DC to DC Converter PN 360-2424TS-030 SAMPLE FLOW AIR FLOW Sample Input Sample Vent Calibrate Vent Vent Span Gas Figure 17 Unit Flow Diagram Model 1000 H2S Echem Instruction Manual Rev. 2.
Model 1000 H2S Echem Sample Flow Fault Air Flow Fault Figure 18 Pump Box Flow Diagram Model 1000 H2S Echem Instruction Manual Rev. 2.
Model 1000 H2S Echem 17. Wiring Diagram Red 18AWG 30 + + 18-36 VDC IN 24VDC OUT 2.
Model 1000 H2S Echem Appendix C Revision Log Revision 2.3 2.4 2.5 Date 02/12/09 09/04/09 07/06/10 2.6 06/02/11 2.7 09/19/11 2.8 06/06/12 Changes made Previous Revision Update Spare Parts Update Spare parts to reflect High Range sensor , Added new range (0-5%) to Sample Flow Rate tables Updated drawings and Spare Parts List to show Detcon Aluminum condulet Updated notation for VDC input in section 3.
