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Summary of Contents for PEMTECH PT605
- Page 1 Gas Detection Technology PT605 Dual Gas Analyzer S & CO Revision 7 February 2010 Operator’s Manual Pem-Tech, Inc. Houston, Texas U.S.A www.pem-tech.com...
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Page 2: Table Of Contents
Table of Contents Sections Page No. Specifications Operation Overview PT605 Analyzer – Block Diagram Figure 1. PT605 – Unit Layout Front Panel Clear Cycle H2S Sample Cycle Messages and reading display during Normal sampling cycle Alarm LEDs and keypad switches... - Page 3 Table of Contents (continued) Sections Page No. Fine tuning of 4-20mA analog output Alarm Relays Programming Alarm levels MODBUS RTU Communication Edit / Assign unit address MODBUS Communication and Data register list Replacing Analyzer Sensor Assembly Care Maintenance Spare Parts List...
- Page 4 NOTICE PEM-TECH INCORPORATED SHALL NOT BE LIABLE FOR TECHNICAL OR EDITORIAL ERRORS OR OMISSIONS MADE HEREIN, NOR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES RESULTING FROM THE FURNISHING, PERFORMANCE, OR USE OF THIS MATERIAL. LIMITED WARRANTY Pem-Tech, Incorporated warrants all the equipment to be free from defects in workmanship and material.
- Page 5 SERVICE POLICY Pem-Tech has service facility at the factory. For all the repairs contact at our toll free number 1-800-379-3894 or visit our website www.pem-tech.com For all repairs call us for a Return Material Authorization number (RMA). Inform us briefly the nature of the problem and obtain shipping address. Properly pack the equipment before shipping.
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Page 6: Specifications
SPECIFICATIONS Typical Range: H2S: 25 ppm, & 200 ppm CO2: 5%, 10% (Other Ranges also available) Range is pre-programmed at the factory Electrical Classification: Class I Div 1, Suitable for use in Hazardous Location Weight 70 Lbs (31.8 Kg) 110 Lbs (49 Kg ) with Fiberglass enclsoure Sample Gas Physical properties: Dry and particle free Temperature: 10 F to 110 F (4 C to 50 C) ¼”... -
Page 7: Operation
OPERATION Overview The following figure illustrates an overview of the units operation. Refer to figure 1 for complete system layout. PT605 Analyzer – Block Diagram Main Electronics and Control Assemblies Sampling System Junction Box Solenoid Main CPU Board Assembly Valve... - Page 8 Measurement: The measurement of CO is continuous. The on-line gas is continuously being diffused into the Infra-red CO sensor sampling assembly. The CO reading is updated every second on the display. Also 4-20mA is generated and alarm relays are energized if CO2 concentration exceeds the preset alarm levels.
- Page 9 Figure 1. PT605 Analyzer in fiberglass enclosure. Complete unit layout...
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Page 10: Front Panel
Front Panel PT605 front panel is equipped with a large liquid crystal display with back light, four alarm LEDs for visual alarm indicators, and keypad switches. The H S & CO concentration and sample and clear mode are displayed on the LCD. The keypad switches are used to reset alarms, calibrate sensors and program unit configuration. -
Page 11: Clear Cycle
sampling cycle the gas reading increases as the H S concentration in the sampling chamber increases. The data on the last line of the LCD is simply used as a diagnostic and troubleshooting feature Clear Cycle During normal operation the duration of the clear cycle is 3 minutes. An internal solenoid valve is switched off during this cycle restricting the flow of sample gas through the H S sensor assembly and allowing the sensor to purge with ambient air. -
Page 12: Alarm Leds And Keypad Switches
Alarm LEDs and Keypad switches There are 4 LEDs on the front panel labeled AL1 thru AL3 and a Fault LED. These LEDs are the visual indicators of any active alarms. The alarm relays and LEDs can be reset by pressing the RESET key on the front panel. -
Page 13: Installation And Unit Startup
PT605 Analyzer is suitable for use in hazardous location. The unit can be mounted to the wall or panel. Refer to figure 2 for the mounting holes and dimensions on the fiberglass enclosure. - Page 14 Figure 2. Fiberglass Enclosure for PT605 Analyzer...
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Page 15: System Wiring
The analyzer is DC operational only if it is not equipped with the AC input terminal on the customer connection board assembly. 4-20mA analog output: PT605 Analyzer generates a linear 4-20mA DC analog output equivalent to H S concentration in the stream. This analog output can be connected to devices like PLC, DCS and chart recorders. -
Page 16: User Connection And Wiring Diagram
Figure 3. User connection and Terminations for Power, alarms, and 4-20mA analog output... -
Page 17: Alarm Relay Contacts
MODBUS Communication later in this document for additional details. Connecting the gas stream to the analyzer PT605 requires a clean and dry gas sample from the process stream for proper operation. A minimum of 50 PSIG line pressure is needed. In normal operation the pressure should not exceed 500 PSIG. -
Page 18: Unit Startup Check List
Unit Startup Check list Use the following steps as a guide for proper startup procedure. Unit must be installed in shaded area to avoid extreme heat conditions. Perform all the system wiring as discussed in the previous section. ... -
Page 19: Stop - Important Installation And
Important Installation & Maintenance Note Do not block Vents on the system enclosures. There is Vent tube fitting located one top left corner of the system enclosure. Blocking vent or attaching a long tubes on vents will create back pressure that may result in sensor contamination. -
Page 20: Sensor Calibration
Sensor Calibration Typically the H S & CO concentration of the calibration gas should be close to 50% of the full scale range of the analyzer. The following table lists the calibration gas for analyzer with different full scale range. Recommended Recommended S Range... -
Page 21: H2S Sensor Calibration
H2S Sensor Calibration Calibration Procedure Remove the cap from the calibration port of the three way valve installed. Move the valve handle to CALIB position. This will shut off the sample input from the stream and allow the calibration gas to flow to the sensor. Connect the calibration gas to the CALIB port on the valve. - Page 22 output from the sensor. The gain factor is a number between 1 and 250. A good sensor should have a gain factor between 40 and 240 STEP 6. At the end sampling cycle the analyzer switches off the solenoid valve and the sensor begins to clear.
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Page 23: Tips On Good Calibration
Tips on good calibration (for H2S) In order to perform good calibration, follow the instructions below Make sure the flow meters are stable and are set at 1 SCFH. Not enough pressure on the calibration gas may cause flow meter to fluctuate and will result in inconsistent flow of gas through the sensor. -
Page 24: Co2 Sensor Calibration
Sensor Calibration Typically the CO concentration of the calibration gas should be close to 50% of the full scale range of the analyzer. The following table lists the calibration gas for analyzer with different full scale range. Recommended CO2 Range of Analyzer Calibration Gas 2.5 % 10 %... -
Page 25: Sensor Calibration Procedure
Step by Step Calibration Procedure Remove the cap from the calibration port of the three way valve installed. Move the valve handle to CALIB position. This will shut off the sample input from the stream and allow the calibration gas to flow to the sensor. Connect the calibration gas to the CALIB port on the valve. - Page 26 STEP 4. After purge cycle the following message will be displayed. Apply Calib Gas CO2 = 0.0 SensrSignl = 0.4 v The unit is now ready for gas standard. Apply the CO2 calibration gas and make sure the flow meter is set at 1.0 SCFH. Calibration gas must be applied for at least 2 minutes. When the Sensor Signal reading has stabilized then by using ▲...
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Page 27: Tips On Good Calibration
Tips on good calibration (for CO2) In order to perform good calibration, follow the instructions below Make sure the flow meter is stable and set at 1 SCFH. Not enough pressure on the calibration gas may cause flow meter to fluctuate and will result in inconsistent flow of gas through the sensor. -
Page 28: Fine Tuning Of 4-20Ma Analog Output
Fine tuning 4-20mA Analog Output All the 4-20mA analog output adjustments are performed at the factory. However, the user may desire to fine-tune the analog output. First make sure that the load is connected or the analog output terminal is connected to a PLC and then follow the instructions below. -
Page 29: Alarm Relays
Alarm Relays There are 3 programmable relays for alarms. Each sensor can have 2 relays assigned for low and high Alarms. Relays are designated such that low alarm is distinct for H S and CO however, the high alarm relay is shared by both sensors. The alarms levels can be programmed anywhere between 0 and the full scale range of each sensor. - Page 30 When arrow is pointing to L (Latching) or NL (non-latching) field use the UP and DOWN arrow keys to toggle between L and NL and press ENTER when done. After modifying all 3 fields for an alarm the arrow will jump to next line or next alarm. Modify both Lo and Hi alarms in similar manner using the UP and DOWN arrow keys to change the value and ENTER key to accept the change and skip to next data field.
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Page 31: Modbus Rtu Communication
RTU protocol. Only the PLC / Controller can make requests to read the contents of the data register in PT605. A unique address must be assigned to Model PT605 analyzer in order for the PLC to request data from the unit. Refer to previous section for assigning address to the analyzer. -
Page 32: Modbus Communication And
Modbus Registers Description 40001 Heart Beat register. Simply a counter that is increment every second to indicate the analyzer is operating properly The counter overflows to 0 after 65535 (approx 18 hours) 40002 Spare not used. Value read would be 0 40003 Current analyzer mode. - Page 33 Modbus Registers Description 40011 H2S Calibration Data: GFactor 40012 H2S Calibration gas used 40013 H2S Calibration data: Zero Set point (integer value of volts /100) For example 90 means 0.90 volts of zero or baseline sensor signal voltage 40014 H2S Calibration data: Span Set point (integer value of volts /100) For example 160 means 1.60 volts of net span sensor signal...
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Page 34: Replacing Analyzer Sensor Assembly
Replacing Analyzer Sensor Assembly After long exposure to the gas sensor may lose its accuracy. Sensor should be replaced if the accuracy is not to the desired level even after calibration of the sensor as discussed in the previous sections. Both H2S and CO2 sensor assemblies are located inside the sampling system junction box. -
Page 35: Care
Care PT605 should not be installed facing the direct sunlight. Installation in an extreme high temperature region should be avoided. All the covers must be tightly installed to avoid any electrical hazards and to avoid any dust or water getting inside the unit. -
Page 36: Spare Parts List
S-67-10020 Max Range: H2S=100 ppm CO2= 20 % Power, Relay & Connection board assembly S-48-03 Purging Pump assembly for PT605 S-403 Flow meter with fittings (2 each right angled tube fittings) S-404-01 In-line Coalescing filter complete with tube fittings S-135... - Page 37 Blank Page...