GasClam specification

23May / 2011

GasClam specification

GasClam® specification

The GGS GasClam® instruments are serviced and calibrated annually.  Routine maintenance including the replacement of filters and seals. Operational checks are carried out at regular intervals and prior to deployment at a site.  Copies of the calibration certificates for the instruments used on site are included as standard within reporting.   Details of the sensor specification are provided below:

Sensor

Method / Type

Range

Resolution

Methane (0-100%)

Infrared

0 – 100%v/v

1% of measuring range above 50%, 0.5% below 50%

#Methane (0-5%)

Infrared

0-5%v/v

0.05%

Carbon Dioxide (0-100%)

Infrared

0 – 100%v/v

1% of measuring range above 50%, 0.5% below 50%

#Carbon Dioxide (0-5%)

Infrared

0-5%v/v

0.05%

Oxygen

Electrochemical

0 – 25%v/v

0.1%

*Hydrogen Sulphide

Electrochemical

0 – 100ppmv

1ppmv

*Carbon Monoxide

Electrochemical

0 – 1000ppmv

1ppmv

*Total Volatile Organic Compounds

PID

0 – 4000ppmv

1ppmv

Atmospheric Pressure

Piezoelectric

800 – 1200mb

1mBar

Borehole Pressure

Piezoelectric

800 – 1200mb

1mBar

Temperature

Internal chip

-5°C to +50°C

1°C

# Only installed on the 0-5% High Resolution GasClam®  * Only installed in VOC GasClam®

The GGS GasClam® equipment is battery powered and runs off two D cell batteries.  Under normal operating conditions the bulk gas units can take approximately 1350 readings (approximately 8 weeks based on hourly sampling), with the other units taking approximately 600 readings (approximately 3.5 weeks based on hourly sampling) before the batteries need replacing.

If the GasClam® equipment is operated in extreme conditions of temperature and/or moisture the number of readings that can be taken will be reduced. Heavily choked water stripping filters result in the on-board pump having to draw more power that in turn drains the batteries quicker. GGS carefully assess the site conditions before deciding on the moniting frequency and filter and battery replacement periods to ensure optimum data acquisition is achieved.

Please follow the following link for our GGS GasClam® information sheet:

GGS GasClam Instrumentation Overview & Deployment Information

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