3.14
3.3.6 Externally Powered Solenoid Valve Connections
Connect via solenoid valve relays as detailed. Ensure that the relay rating is not
exceeded.
WARNING
If installation is in a hazardous area, use suitable certified solenoid valves.
NOTE
Valve (SV3) reverts to OFF in Shutdown (Serious Fault) condition. The use of the
optional 3rd "Sample/Inert valve will prevent sample entering the 2500 sample cell
while the cell or chopper box under temperature diagnostic is activated, i.e. heated
cell is not fully warmed up. This can be used whether or not Autocalibration is used
and will be appropriate in some applications: e.g.
• if there is a possibility of condensation forming in the sample cell during warm
up, then nitrogen or another purge gas must be used to flush the cell during
it's warming up period.
• if a hazardous sample is being monitored, the cell should be purged in the
event of a serious fault.
Table 3.4 – Externally Powered Solenoid Valve Connections
Valve State (ON=Current Flow Through
Solenoid)
Span/Zero
Valve SV1
TB34 – 1
TB34 – 2
Cal/Sample
Valve SV2
TB34 – 3
TB34 – 4
Sample/Inert
Valve SV3
TB34 – 5
TB34 – 6
Cell or Chopper Box
Under Temperature
either either OFF(Inert)
NORMAL STATE OFF OFF (Zero) ON(Sample) ON(Sample)
Zero Sample Required OFF (Zero) ON(Cal.) ON(Sample)
Span Sample Required ON(Span) ON(Cal.) ON(Sample)
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