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12.2 Toxic Sensors
The PGD2 instrument can be fitted with either one or two toxic gas sensors as detailed in the following sections. However, it should be
noted that where an instrument is fitted with two sets of pellistors to provide monitoring of flammable gases up to 100% volume then
only one toxic sensor (3-series type) can be accommodated.
The toxic gas sensors are of the three-electrode electrochemical type and are designated as either the ‘3-series’ or ‘4-series’
(miniature) toxic sensors. The type/s fitted within a particular instrument will depend upon the gas sensing application and also the
physical arrangement of the instrument internally in order to achieve the requirements of the particular intended application.
12.2.1 Cross Sensitivity
The user should be aware that although the toxic sensors are designed to respond to the presence of specific gases they may also
exhibit response to other gases. This is known as their cross-sensitivity.
Some toxic sensors can be supplied fitted with chemical inboard filters to reduce the cross-sensitivities to other gases.
It is not within the scope of this instruction manual to detail the cross-sensitivity of each toxic sensor to each interfering gas. For further
information on this subject contact ENMET customer service.
12.2.2 Temperature Dependence
Toxic sensors exhibit changes in output signal with changes in temperature.
When exposed to sharp changes in temperature the toxic sensor/s will exhibit a transient response which should die away within
approximately 20 seconds.
12.2.3 Stabilization
New toxic sensors when supplied as spares are fitted with a shorting link across the Sensing and Reference terminals which maintain
the sensor in a ‘ready to work’ condition. This shorting link must be removed before the sensor is fitted into the PGD2.
Once a sensor is fitted into the instrument it relies upon the main battery power to maintain its ‘ready to work’ status. If the battery pack
is removed or the battery life is exhausted, the instrument may alarm or display erroneous readings following battery pack
replacement. This is normal when the sensors have not been powered for a prolonged period. Normal readings will continue when the
sensors have been allowed to stabilise (within 2-3 hours following battery pack replacement dependant upon sensor type). This
condition only occurs after a prolonged period without batteries fitted and should not occur during normal battery changing when the
sensors should stabilise within 5 minutes.
Common characteristics
The following characteristics are common to all of the toxic sensor types:-
Common Characteristics of the Toxic Gas Sensors
Expected operating life - 2 years
Storage life - 6 months in container provided
Recommended storage temp. - 0 - 20 degrees C
Operational temp. range - -20 to +50 degrees C
Relative humidity - 15 to 90% non-condensing
Pressure range - Atmospheric ± 10%
Poison sensitivity - None
- Operation and Maintenance 1
- CONTENTS 2
- ERTIFICATION 4
- EFINITIONS AND 5
- BBREVIATIONS 5
- EATURES AT A 5
- 5.1 Specification 6
- 5.2 General Description 7
- PERATING 9
- NSTRUCTIONS 9
- FRONT PANEL SWITCHES 9
- TOP PANEL SWITCHES 9
- 6.1 Switching on 10
- 6.2 Switching off 10
- 6.3 Peak Readings mode 10
- 6.4 Sentinel working mode 10
- 6.5 Menu facilities 11
- 6.6 Date / Time 11
- 6.7 Adjust Sounder 11
- 6.8 Calibration Due Date 11
- 6.9 STEL and TWA Values 12
- 6.10 Alarm Levels 13
- 6.11 Flammable Display 14
- 6.12 Set LCD Contrast 15
- 6.13 PGD Serial No 15
- 6.14 Alarm Accept 15
- 6.15 Low Battery Alarm 15
- 6.16 Display Backlight 15
- 6.17 Sensor Zero 16
- 6.19 Confidence Bleep 16
- 6.20 User Identification 16
- 6.21 Data Logging 17
- 6.22 Overrange Indication 18
- 6.23 Fault Indication 18
- 6.24 Aspiration 18
- 7.1 Pump Operation 19
- 7.2 Pump Blockage 19
- 8.1 Calibration 20
- HARGING 22
- QUIPMENT 22
- 9.5 Battery Module Charging 23
- 11.1 Areas of use 24
- 11.2 Methods of use 24
- 11.3 Basic Precautions 24
- 12.1 Flammable Sensors 25
- 12.2 Toxic Sensors 27
- 12.3 Oxygen Sensors 29
- 13.2 Calibration 30
- ROUBLESHOOTING 31
- 15 WARRANTY 32
- Repair Return Form 34
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