14
Surveyor 4B
User Manual
FAULT alarms
The SV 4B is equipped with a fault alarm (visual alarm (rep 2, Figure 7), audio
alarm and relay 1) which is activated in the following cases:
•
One or more wires of the telemetry line interrupted
•
One or more wires of the telemetry line short-circuited or with
excessive power consumption.
NB : The ALARM LEDs may also be activated depending on the
circumstances of the interruption or the short circuit.
Adjustments
The operations and adjustments described in this chapter must
be performed by authorized personnel only as they can affect the
appliance's reliability in detection.
Gas detectors are safety devices. OLDHAM recommends the regular testing
of fixed gas detection installations. This type of test consists of injec ting the
calibration gas into the detector at a sufficient concentration to activate the
pre-set alarms. It is to be understood that this test is in no way a replacement
for a detector calibration.
The frequency of gas tests depends on the industrial application where the
detector is in use. Frequent inspections should be made in the months
following the commissioning of the installation, and should then become more
widely spaced provided that no significant deviation is observed. If a detector
should fail to react in contact with the gas, calibration is essential. The
frequency of calibrations shall be appropriate according to the results of the
tests (humidity, temperature, dust, etc.); however, it must not exceed one
year.
The general manager should put safety procedures in place on-site. OLDHAM
cannot be held responsible for their enforcement.
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