1.5
1.4.2 Heated Sample Cell – Steam
Where fitted, this is a steam heating coil which must be supplied with low pressure
steam by the user and vented to atmosphere, to maintain a cell temperature of
approximately 100°C. This allows cell heating in hazardous areas up to Zone 1/Div. I
classification, and is normally used with the EU1 version only.
1.4.3 Optional Output Cards
As standard, all 2500 Analysers have 2 analogue mA (current) outputs and 3 relay
contact pairs. The analogue outputs are user configured as described in the Quickstart
manual. The relay contacts are user-assigned to any combination of concentration
alarms, Fault alarm, or calibration in progress, as similarly described in the Quickstart
manual. These standard outputs originate from the Sensor Interface Board (SIB PCB)
of the 2500.
An additional output PCB is available as option:
The 02000/916 PCB provides an extra 2 x (mA) plus 2 x (relay) outputs
This additional output PCB can be fitted into the normally vacant slot 2 in the 2500.
These extra outputs are configured along with the standard outputs in the usual way
(See Quickstart manual).
1.4.4 Compensation Options
The output of any infrared analyser is affected by changes in sample pressure and
sample temperature, unless compensation is applied. Alternatively, these parameters
can be kept constant by a suitable sample conditioning system. Ambient (barometric)
pressure will also affect sample pressure in the analyser if a gas sample is being simply
vented to atmosphere. The following compensation options may be fitted to a 2500.
• Sample Pressure Compensation
A solid state pressure transducer is fitted and plumbed into one sample cell connection.
A continuous pressure measurement over the range of the standard transducer, 0 -345
kPa (0 – 50 psia), is made by the 2500. During calibration in the factory, an empirical
sample pressure/span concentration relationship is determined and stored in memory
to calibrate the compensation. Suitable for gas sample measurements only.
This option is detailed in Section 3.5
NOTE
Any or all of these analogue outputs may be configured as a voltage output by hardware
link selection, as an alternative to current output.
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