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• For the most accurate measurements, measure the concentration of hydrogen sulfide in the water,
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not in the air.
• In a gravity system, measure as near to the end of a pressurized water pipe as possible to get an
accurate measurement of the initial hydrogen sulfide concentration. Dissolved hydrogen sulfide is
released from water when the water enters an aerated well.
• For air measurements, install the sensor so that the measuring end of the sensor is higher than
the water level during high-water events so that unwanted material does not collect on the sensor.
• Install the sensor in a location with sufficient flow and turbulence around the sensor so unwanted
material does not collect on the sensor.
• Keep the sensor out of stagnant water or biofouling will occur.
4.4.3 Install the sensor
Gas exposure hazard. Hydrogen sulfide is a highly toxic gas. Put on the personal protective
equipment identified in the safety data sheet (MSDS/SDS). Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
Do not point the measuring end of the sensor up or damage to the sensor can occur (e.g., during storage,
transport, calibration, installation and operation).
If the sensor installation is free-hanging, make sure that the installation prevents damage to the sensor. Do not let
the sensor hit objects, walls or bottom surfaces.
Pre-requisites:
• The sensor cables are connected to the sensor and a field transmitter or a device. Refer to
Electrical installation
• The sensor has been calibrated at the measurement location. Refer to
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When hydrogen sulfide is measured in the water, the measurement is not dependent on the daily
changes in ventilation conditions in the space above the water or the installation location of the
sensor.
18 English
D A N G E R
N O T I C E
N O T I C E
on page 13.
Calibration
on page 16.
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