Riken Keiki GP MED EX Operating Manual Download Page 47

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7 Maintenance

7-4. Parts replacement

- 45 -

List of recommended regular replacement parts

No. Item

Maintenance

intervals

Replacement

intervals (year)

Quantity

(pieces/unit)

Rubber seal

(for the sensor)

6 months

3 - 8 years

Aspirator cap

6 months

3 - 8 years

NOTE



The above replacement intervals are recommendation only. The intervals may change depending on the

operating conditions. These intervals do not mean the warranty periods either. The result of the regular
maintenance may determine when to replace the parts.

Summary of Contents for GP MED EX

Page 1: ...PT2E 3030 Smart transmitter Gas Detector Head SD 1D TYPE GP MED EX Operating Manual PT2E 161 ...

Page 2: ...tact output of the detector must be used for an external alarm lamp buzzer while the alarm signal output must be used for an indicator or external recorder If these outputs are used to control other units we shall not be responsible for any malfunctions 4 The gas sensing part of the gas detection sensor installed in this detector is made of metal porous sintered alloy permeated with an oxidation c...

Page 3: ... 4 6 How to wire 17 5 How to Operate 21 5 1 Preparation for start up 21 5 2 Basic operating procedures 21 5 3 How to start the detector 22 5 4 Modes 23 5 5 User mode 24 5 6 How to exit 26 6 Operations and Functions 27 6 1 Gas alarm activation 27 6 2 Fault alarm activation 28 6 3 External output operation 29 6 4 Other functions 30 7 Maintenance 31 7 1 Maintenance intervals and items 31 7 2 Regular ...

Page 4: ...lyzer or densitometer which performs quantitative qualitative analysis measurement for gases Please fully understand the features of the detector before using it so that it can be used properly The detector detects abnormalities in the air caused by presence of gases or other reasons leak with the built in gas sensor The concentrations of detected gases are displayed on the seven segment LED An ex...

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Page 12: ...ent LED four digit Sensor POWER INPUT 24 VDC 1 Gas alarm contact ALARM or 2 Fault contact FAULT or 3 Select either gas alarm or contact ALARM FAULT Contact activation De energized De energized at a normal state ON ALARM Closed contact at an alarm state Alarm contact controller Magnetic operation part MENU ESC SET Transmitter 4 20 mA transmission ...

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Page 15: ... lightning there are more sources of surge noise To protect units from these noise sources the units must be grounded The lightning arrester has a circuit to remove a surge voltage which damages field devices so that signals may be attenuated Before installing a lightning arrester verify that it works properly ...

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Page 29: ...ration Display In case of over the detection range Over Scale is displayed on the LED Power Indicator Lamp POWER Green During operation this lights up continuously Alarm Indicator Lamp ALM Red It lights up when the alarm setpoint value is reached to or exceeded Contact Activation The contact is activated when the gas concentration reaches or exceeds the alarm setpoint value only when the alarm is ...

Page 30: ...k that gases remain by using a portable gas detector Determine that the point is free from dangers and take actions to fix the gas leak NOTE When high concentration gas exceeding full scale is detected the sensor may be contaminated In such a case in order to ensure the reliability of the detector carry out zero calibration and span calibration properly 6 2 Fault alarm activation A fault alarm is ...

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Page 33: ...xist around it Flow rate check Check the flow rate to find abnormalities Filter check Check the dust filter for dust or clogging Alarm Test Inspect the alarm circuit by using the alarm test function Span Adjustment Perform the sensitivity calibration by using the calibration gas Gas Alarm Check Check the gas alarm by using the calibration gas Ground wire check Check the connection of the grounding...

Page 34: ... dust filter Alarm Test Inspects the alarm circuit by using the alarm test function Checks the alarm lamps Check each activation of ALM1 and ALM2 Checks the external alarm Checks the activation of the external alarm such as a buzzer Span Adjustment Performs the sensitivity calibration by using the calibration gas Gas Alarm Check Checks the gas alarm by using the calibration gas Checks the alarm Ch...

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Page 45: ... adjustment has not been completed Check if the correct concentration span adjustment gas has been provided and check the gas adjustment tool for a gas leak If there are mistakes perform the span adjustment again If the span adjustment cannot be performed even when there is no mistake or after the correction the gas sensor life has expired After turning off the power supply please contact our over...

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Page 47: ...vals year Quantity pieces unit 1 Rubber seal for the sensor 6 months 3 8 years 1 2 Aspirator cap 6 months 3 8 years 1 NOTE The above replacement intervals are recommendation only The intervals may change depending on the operating conditions These intervals do not mean the warranty periods either The result of the regular maintenance may determine when to replace the parts ...

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Page 49: ... surge noise etc Turn off and restart the detector If such a symptom is observed frequently take appropriate measures to eliminate the noise Sensor abnormalities E 1 The sensor is not connected or improperly connected Check if the sensor cable is securely fastened to the terminal plate Zero drift caused by environmental changes or degradation over time is off the threshold Perform the zero adjustm...

Page 50: ...ector If such a symptom is observed frequently take appropriate measures to eliminate the noise Sudden change in the environment When the environment temperature etc changes suddenly the detector cannot adjust to it and is affected by it In some cases the detector triggers an indication alarm Because the detector cannot be used under sudden and frequent environmental changes any preventive actions...

Page 51: ...alarm or energized de energized in response to an alarm Contact capacity 250 VAC 0 5 A 30 VDC 0 5 A resistant load Transmission system 3 wire type analog transmission common cable for power and signal power signal common Transmission specifications 4 20 mA DC linear load resistance under 300 Ω resolution divided into 200 Transmission cable CVVS 1 25mm2 or 2 0mm2 3 core when the contact is not used...

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Page 54: ...etection principle Catalytic Combustion Type When a combustible gas burns on the surface of a oxidation catalyst the catalytic combustion type sensor considers resultant combustion heat as temperature and resistance changes in the platinum wire coil and measures their gas concentrations This sensor detects any combustible gases The detection range is from zero to the lower explosive limit When a h...

Page 55: ...of the detection range LEL A unit which the lower explosive limit LEL of the combustible gas to be detected is set to 100 Calibration Adjusts the readings to the calibration gas concentration value by using the calibration gas Zero suppression A function to cut off the specific drifting that the sensor has Alarm delay time A function which temporarily suspends activation to prevent a false alarm c...

Page 56: ...Revision History Edition Revision Date issued 0 First edition 1 6 2021 ...

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