Start-Up; Maintenance; Sensor Replacement - Helio SL Series Operating Manual

Start up
When initially powered on, the gas detector should be allowed to warm up
allowing the sensor to stabilise before calibration.

Maintenance

Helio Gas Detection systems must be inspected and serviced regularly by
trained service personnel. We recommend that a service contract be obtained
with a HELIO Gas Detection approved vendor and that all repairs also be
carried out by them. Only authentic HELIO components may be used for
maintenance purposes. During regular service inspections a full zero and span
calibration must be carried out. Verify the activation and de-activation of all
alarm output signals.
Ensure that gas can freely penetrate the sensor. If required replace the sensor.
Use sensors which are approved only by HELIO Gas Detection.

Sensor Replacement

Observe national regulations for the installation of electrical apparatus in
potentially explosive atmospheres devices (EN 60 079-14). Isolate signal
outputs and de-energise the gas detector.
Unscrew stainless steel sensor housing and remove existing sensor. Align the
replacement sensor pins with the PCB mounting inserts and plug in the new
sensor. Ensure that the new sensor is the same gas type and model as the
original sensor. Energise the transmitter and observe sensor warm-up time
allowing sufficient time to stabilise.
When sensor stabilisation is obtained, verify the zero and span calibration.
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Attention:
The detector / control panel outputs must be isolated before
disconnecting the sensor.
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Attention:
After installing a new sensor, the gas detector must be
calibrated.
HGD SL Series Ver. 1.0 6