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2.1. Technical Specifications and Special Instructions for explosive gas detectors
2.1.1. Transfer curves for OLCT 50 / OLCT50-A detectors
The following curve shows transmitter output current values as a function of gas
concentration. Where the user connects the transmitter to a device other than a device manufactured
by ISC/OLDHAM, he must check that the transfer curve is fully compatible with its input
characteristics to ensure that the information generated by the transmitter is correctly interpreted.
Equally, the device must supply a suitable power supply voltage, allowing for cable voltage losses.
Please note: Detectors can generate ambiguous measurements at high gas concentrations, i.e. the
current output for a > 20% concentration of gas by volume is the same as for a concentration of <
5% by volume (bell curve). It is therefore essential that the measuring device memorises the fact
that the value has exceeded the scale and that resetting is manual rather than automatic, and follows
the safety regulations specific to the site.
2.1.2. Metrological details
Type
C1000 filaments - +VQ1
Maximum concentration
100% LEL
Principle
Catalytic
Estimated service life
> 36 months
Storage
Away from air -10°C < T < 35°C
10% < RH < 60%. Maximum 6
months
0 %
100 % 120%
20.0 mA
4.0 mA
1 mA
Concentration
in % LEL
Output Current in
mA
Fault
23.2 mA
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