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the field can be a good way to ensure that the sensor keeps the
absolute accuracy after prolonged deployment. Initially it is rec-
ommended to calibrate the sensor before installation and sub-
sequently once every month, but this can be subject to specific
installation conditions.
The calibration procedure is simple and has no demand for access
to SCADA values or connection of computer/laptop or other data
viewing devices. The calibration routine relies on the SulfiLogger™
sensor's internal detection capability of the calibration gas and
on the presence of a magnetic switch which is activated by the
calibration cap. A number of different indicator light modes gives
signal to the operator of what to do during the calibration, as
described below. The position of the indicator light is shown in
Figure 1.
Figure 1: Close-up view of the SulfiLogger™ sensor showing the
position of the LED indicator light used for signaling during the
calibration process (see below).
To calibrate the SulfiLogger™ sensor, a calibration gas with a con-
centration of 1000 ppm
rately from Unisense together with a calibration kit that facilitates
the activation of the calibration mode in the sensor and ensures a
relevant flow of gas to the sensor during calibration. Refer to the
is needed. This can be ordered sepa-
8
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