Servomex SERVOTOUGH Oxy, Operator'S Manual

Page: 89 / 145

01910001B_8 © Servomex Group Limited. 2020
77
7.
GENERAL OPERATION
Sample and calibra�on gases must be as specified in Sec�ons 2.4
and 2.6
. If the
pressure/flow rates are outside the ranges specified in Sec�ons 2.4
and 2.6
, you must
regulate the gases externally, before they enter the analyser
.
7.1
Checking the relay signal outputs
Note:
Gas selection relays (Sample, Cal lo, Cal hi) are not effected during the signal relay
override as this could cause hazardous gas flows.
If required, use the following procedure at any �me to perform a check on the outputs of the signal
relays fited to the analyser
:
1.
Selec
t:
Service Relay
2.
Figure
88
shows the relay state (Energised or Deenergised) that the relay signals outputs
will be set to when the override is ac�ve. Edit if required.
Figure
88 -
The Relay override state screen
Note:
When a relay is energised, the N/C
-
Common contacts will be open, and the N/O
-
Common contact
s will be closed. The converse is true when the relay is deenergised.
3.
Scroll to the relay override screen.
4. Select the "Yes" op�on, then press the so� key. The relay outputs will now be set
to the selected override state, and you can use your control/monitoring equipment
(connected to the analyser) to monitor the relay signal outputs
Figure
89 -
The Relay override ac�on screen
Note:
The relay signal outputs freeze at the selected override signal state as long as the
‘Override action’ screen is displayed. As soon as another screen is displayed, the relay
signal outputs will be updated to reflect the corresponding alarm, fault and range
states.