PEMTECH PT605 Скачать руководство пользователя страница 7 | Manualshive

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7

Sampling System Junction Box

Main Electronics and Control Assemblies

Termination / User

connection Box

Dry Sample in

¼ Tube Fitting

vent

Air Intake

PT605 Analyzer – Block Diagram

OPERATION

Overview

The following figure illustrates an overview of the units operation. Refer to figure 1 for
complete system layout.

When the power is applied to the unit it will display startup messages such as current alarm set
points, background or interference gas settings and sensor calibration data.
After the startup messages the system will begin the warm up cycle for approximately 10
minutes (600 seconds). This allows the sampling system to clear and perform initial diagnostic
tests.

H

2

S Measurement:

For the measurement of H2S concentration the analyzer performs sample &

purge routine. The analyzer samples the on-stream gas for 90 seconds and then purges for 180
seconds. At the end of sample cycle the internal solenoid valve is switched off and ambient air
is pumped into the sampling system to purge. The final H2S reading is updated on the display,
4-20mA output is generated and alarm relays are energized if the H2S concentration exceeds
the preset alarm levels.

Sample Conditioning

Pressure Regulators

External Filters

CO2

Sensor Asmbly

Main CPU Board Assembly

Control Logic

Flow Meter +

Coalescing Filter

H2S

Sensor Asmbly

Solenoid

Valve

Gas Sample

routing & Vent

block with tube

Purging Pump

Terminal Blocks

4-20mA

Alarm Relays

AC / DC power Input

Sensor Signal conditioning

AC-DC , DC-DC power convertors. Alarm
relays

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Содержание PT605

Страница 1: ...Gas Detection Technology PT605 Dual Gas Analyzer H2S CO2 Revision 7 February 2010 Operator s Manual Pem Tech Inc Houston Texas U S A www pem tech com ...

Страница 2: ...15 AC Power Input 15 DC Power Input 15 4 20mA Analog output 15 User connection and wiring diagram 16 Alarm Relay contacts 17 RS232 485 Serial Communication 17 Connecting Gas stream to the Analyzer 17 Unit startup check list 18 STOP Important Installation and 19 Maintenance note Sensor Calibration 20 H2S Sensor Calibration 21 Sensor calibration procedure 21 Tips on good calibration 23 Sensor calibr...

Страница 3: ...ng of 4 20mA analog output 28 Alarm Relays 29 Programming Alarm levels 29 MODBUS RTU Communication 31 Edit Assign unit address 31 MODBUS Communication and 32 Data register list Replacing Analyzer Sensor Assembly 34 Care 35 Maintenance 35 Spare Parts List 36 ...

Страница 4: ...rol of PEM TECH including but not limited to damage by accident negligence tampering or failure to operate in accordance with the procedures outlined in the Operations Manual PEM TECH s liability under no circumstances will exceed replacement of the unit claimed to be defective Tampering with the equipment and altering it for uses other than the intended use or replacement of parts not supplied by...

Страница 5: ...and obtain shipping address Properly pack the equipment before shipping Also include your complete shipping address and contact name and phone number For non warranty repairs you must provide the limit to repair costs State if a quote for repair cost is required before you can authorize the repair cost For this an additional charge may be applicable NOTE 1 For all the repairs under warranty serial...

Страница 6: ...F to 110 F 4 C to 50 C Sample inlet Tube Fittings Stainless Steel tube fittings Repeatability When challenged with same calibration gas H2S within 0 5 ppm analyzer with 25 ppm range 2 ppm analyzer with 200 ppm range CO2 within 0 2 Accuracy 3 Alarm Relays 3 SPDT fully programmable dry relay contacts Form C Type Rated 5 amps 125 VAC or 24 VDC Analog Output 4 20 mA 350 maximum loop resistance Display...

Страница 7: ... diagnostic tests H2S Measurement For the measurement of H2S concentration the analyzer performs sample purge routine The analyzer samples the on stream gas for 90 seconds and then purges for 180 seconds At the end of sample cycle the internal solenoid valve is switched off and ambient air is pumped into the sampling system to purge The final H2S reading is updated on the display 4 20mA output is ...

Страница 8: ...ery second on the display Also 4 20mA is generated and alarm relays are energized if CO2 concentration exceeds the preset alarm levels Note In an installation where ambient air is contaminated with H2S and other toxic gases it is recommended that clear instrument air must be used The instrument air should be connected to the air intake located below the sampling system enclosure ...

Страница 9: ...9 Figure 1 PT605 Analyzer in fiberglass enclosure Complete unit layout ...

Страница 10: ...ng Sample Cycle The first and second line on the LCD displays the concentration of the H2S and CO2 The third line indicates when the analyzer is sample or Purge mode for the H2S measurement The last line indicates the status or signal strength of the sensors If in clear cycle E1 is the signal level for the H2S sensor while E2 is the signal level of the CO2 sensor If the analyzer is in H2S sampling...

Страница 11: ...ly H2S Sample Cycle The duration of sample cycle is 90 seconds During this cycle the solenoid valve is switched open to allow the sample gas to pass through the H2S sensor assembly While the sensor is being exposed to the gas containing H2S the instantaneous H2S ppm reading and the sensor signal strength increases as is displayed on the last line of the he LCD At the end of the sample cycle the H2...

Страница 12: ...nt panel The resetting of the alarms via reset switch can only be performed in the clear cycle When the PRGM program key switch is pressed the unit will initiate a sequence of prompts giving user option to select one by pressing the ENTER key The list of option includes H2S Sensor Calibration CO2 Sensor Calibration Adjust H2S Alarms Adjust CO2 Alarms 4 20mA Adj H2S 4 20mA Adj CO2 Set Unit Address ...

Страница 13: ...t be at a minimum pressure of 50 PSIG and must have a regular flow through the sampling system All vent fittings must be left open to atmosphere and should not have any back pressure Refer to figure 1 for the location of the junction box with customer connection and terminals Also refer to figure 3 for connections and wiring diagram The connection box has 2 each NPT female cable entry ports Instal...

Страница 14: ...14 Figure 2 Fiberglass Enclosure for PT605 Analyzer ...

Страница 15: ... Power Input If the unit is powered by DC connect 16 24 VDC supply to the 2 pin DC power input terminal in one of the junction boxes The terminal is clearly labeled as DC IN on the customer connection board Simply connect the positive and negative supply lines to the connector pin labeled as and respectively Note The analyzer is DC operational only if it is not equipped with the AC input terminal ...

Страница 16: ...16 Figure 3 User connection and Terminations for Power alarms and 4 20mA analog output ...

Страница 17: ... process stream for proper operation A minimum of 50 PSIG line pressure is needed In normal operation the pressure should not exceed 500 PSIG The regulator installed on the analyzer has maxim inlet pressure rating of 2000 PSIG with 30 PSIG on the output port However a drastic pressure drop from over 2000 PSIG to 30 PSIG will increase the temperature of the gas which could be damaging to the sampli...

Страница 18: ...e analyzer via stainless steel tube Make sure the 3 way valve next to the pressure regulator is switched to SAMPLE position Switch ON the AC or DC power to the analyzer The LCD should display start up messages After start up messages and warm up cycle the unit will begin its normal operation If alarm relays are being used then set alarm levels when the system is in clear cycle Refer to section on ...

Страница 19: ...g pump is not running It is imperative that the sampling system must be purged after each sample An internal pump purges the sampling chamber with fresh ambient air If the purging pump malfunctions or when the flow rate in the air flow meter is not at least 1 SCFH then shut off the flow regulator to the analyzer Pump failure or the purging with the contaminated ambient air will result in sensor fa...

Страница 20: ... calibration gas The microprocessor then makes all the adjustments necessary and stores the calibration data in a non volatile memory The analyzer will display the message for any calibration errors otherwise a Calibration OK message is displayed and the unit will return to normal operation If the user wishes to check the calibration then simply apply the calibration gas when the analyzer is in no...

Страница 21: ...ill now perform a 1 minute clear cycle The time remaining in this cycle will be displayed on the LCD STEP 4 After 1 minute clear cycle the following message will be displayed Apply the calibration gas Make sure the air and sample flow meters are set at 1 SCFH and then press ENTER switch STEP 5 The solenoid valve will be switched ON allowing the calibration gas to pass through the sensor housing Th...

Страница 22: ...the calibration gas off After 2 minutes of clear cycle the unit will display calibration end message for few seconds and will return to normal cycle The calibration has now been successfully completed Once completed it is a good practice to apply the same calibration gas in the normal sample cycle and verify that the reading is same as calibrated within tolerance If calibration is not successful t...

Страница 23: ...f the sensor 4 Also note the steady change in the sensor signal displayed on the last line of the LCD The sensor signal should rise as the sensor is exposed to H2S during the sample cycle and should clear to zero state when in purge or clear mode The typical zero state of a sensor is between 0 8 and 1 1 volts Sensor Calibration Error The unit will display messages if sensor calibration error occur...

Страница 24: ... of hardware adjustments The calibration procedure is fully automated The analyzer will display messages on the LCD and prompts for the user input when needed The calibration is performed by first applying the pure nitrogen to purge the sensor and the sampling system in order to set the baseline zero Then a known concentration of nitrogen balanced CO2 calibration gas is applied to set the correct ...

Страница 25: ...gas flow indicated in the flow meter is 1 0 SCFH STEP 1 When the analyzer is in normal operating mode press and hold the PRGM switch until the programming options are displayed Use the and arrow keys to scroll thru the options until Calibrate Sensor is displayed on the LCD Press ENTER to select STEP 2 The analyzer will display Calibrate Sensor Message for few seconds and then prompts user to apply...

Страница 26: ...ng has stabilized then by using and arrow keys adjust and match the CO2 concentration on the LCD with the CO2 concentration of the calibration gas being applied Press ENTER key to accept the change STEP 5 Press the RESET switch when finished to save the calibration data and return to normal operation If calibration is not successful the error message is displayed and the analyzer defaults back to ...

Страница 27: ...nsor is between 0 35 and 0 5 volts Sensor Calibration Error The unit will display messages if sensor calibration error occurs Error Message Description Remedy Zero too High Sensor is unable to clear Check any blockage on sensor vent lines Also check if purging pump is operating Zero too Low Sensor drift below baseline Sensor old or deteriorated Replace with new one No Span Or Span too low Sensor w...

Страница 28: ...cycle press and hold the PRGM to enter in program mode Use and arrow keys to scroll thru the selection Select Adjust 4 20mA for either H2S or CO2 sensor Press ENTER 2 The adjustments are performed first for 4mA and then for 20mA 3 Loosen the thumb screws on both side of the front panel and slowly pull the panel The panel is connected via ribbon cable to the connection board inside the enclosure 4 ...

Страница 29: ...ay current alarm levels as follows When arrow is pointing to Lo Level press the Up arrow key to increase and Down arrow key to decrease the alarm level The alarm levels can be set between 0 and the full scale range of the selected sensor type For example the full scale range of H2S and LEL type sensor is 100 The alarm level can therefore be set anywhere between 0 and 100 If the alarm is set to 00 ...

Страница 30: ... 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 Press the RESET key to exit and save alarm levels Note If an alarm is configured as Latching alarm and once activated it can only be deactivated by pressing the RESET switch Non Latching alarms are however deactivated when the concentration go...

Страница 31: ...ccept the change 4 The new address is saved in non volatile memory and the unit returns to normal operation Modbus RTU Communication Modbus RTU is a standard protocol for communication between a PLC Controller and slave devices This section briefly explains the communication with PT605 analyzer using MODBUS RTU protocol Only the PLC Controller can make requests to read the contents of the data reg...

Страница 32: ...ed time in seconds of current mode 40005 H2S reading of the last sample cycle Typical sampling time every 180 seconds This register is therefore updated every 180 seconds see note 1 40006 Current CO2 Reading 40007 H2S Low Alarm Level see note 1 40008 H2S High Alarm Level see note 1 40009 CO2 Low Alarm Level see note 1 400010 CO2 High Alarm Level see note 1 Continue on next page Note 1 The value in...

Страница 33: ...eline sensor signal voltage 40017 CO2 Calibration data Span Set point integer value of volts 100 For example 160 means 1 60 volts of net span sensor signal 40018 Malfunction or fault code if any 0 No fault 1 Sensor Drift out of tolerance 2 Unit is in exteded clear cycle This happens for high concentration of H2S or an additiona time is needed to clear the remaining sample gas from the sampling sys...

Страница 34: ...ow CO2 sensor Hold down the sensor block and gently remove the tygon tubing connected to the sensor Do not pull the tubing very hard as it may damage the connector on the bottom of the sensor assembly Loosen 2 each thumb screws and gently pull the sensor out of the connecting socket on the circuit board Installing Sensor Assembly Using the stainless steel guiding posts in the connection circuit bo...

Страница 35: ...h distributor for service and extended warranty Maintenance Model PT605 analyzer requires minimum maintenance A proper maintenance schedule includes only sensor calibration Calibration should be performed on a regular schedule according to user s company policy Pem Tech recommends calibration check every 30 days Calibration is not necessarily required every month Use the calibration gas to check t...

Страница 36: ...cing filter complete with tube fittings S 350 Micro fiber filter elements for In Line coalescing filter Sensor Head Assembly 24 150 H2S Sensor assembly Max Range 25 ppm 24 415 H2S Sensor assembly Max Range 250 ppm 24 210 CO2 Sensor Assembly Max Range 10 24 370 CO2 Sensor Assembly Max Range 50 Calibration Gas Peripheral 14 175 2 5 LPM liters per minute Flow regulator with tubing 14 030 10 ppm H2S B...

Страница 37: ...37 Blank Page ...

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