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The Novatech oxygen sensor that is used in the Novatech oxygen probe is extremely predictable, stable and
reliable. For this reason, the calibration of a Novatech oxygen system does not require the use of calibration
gases. However, all Novatech oxygen probes have a built in gas connection that does allow the accuracy of
the probe to be checked in-situ. This chapter describes the operation of this gas checking system.
The 1732 has a timer and solenoid driving system that can be configured to admit a certified calibration gas
into the probe or an air supply to purge the probe filters through the gas connection. Both the calibration gas
and the filter purge gas must be piped to the port on the probe labelled "CAL".
There are two solenoids drivers in the 1732 transmitter. They can be used for any combinations of gas
checking and probe filter purging. The only limitation is that if the transmitter is in dual probe mode, then
solenoid #1 must be wired and plumbed to the probe #1 and solenoid #2 must be wired and plumbed to
probe #2.
The transmitter can also be configured to be in a MANUAL or AUTOMATIC purge and gas check mode.
Menu
Description
23 (32)
Solenoid 1 (2) Operation
24 (33)
Solenoid 1 (2) Auto / Manual
25 (34)
Solenoid 1 (2) Start Time
26 (35)
Solenoid 1 (2) Period
27 (36)
Solenoid 1 (2) Duration
28 (37)
Solenoid 1 (2) Post Freeze
29 (38)
Oxygen Content Cal Gas 1 (2)
30 (39)
Max Cal Gas 1 (2) Positive Error
31 (40)
Max Cal Gas 1 (2) Negative Error
Available if 'Solenoid Operation' is set to either 'Calibration Gas' or 'Purge'
11.1 Purge
For processes that have particulate present in the gas stream, probe filters are necessary and should be
back-purged with sufficient frequency to avoid blocked filters.
Select 'Purge' in Commissioning Menu function #23 (32) and 'Automatic' in function #24 (33) and then set
the times in function #25 (34) to #28 (37) The outputs can be frozen during purging if selected in
Commissioning Menu function #22.
A flow switch can be wired to terminals 16 and 17. If the flow is not sufficient at the end of the purge cycle to
close the contacts of the flow switch a 'Probe 1 (2) Filter Blocked' alarm is generated. If a flow switch is not
being used a short circuit should be placed across terminals 16 and 17 to suppress the 'Probe 1 (2) Filter
Blocked' alarm.
11.2 Calibration Gas
If it is required to automatically check the oxygen probe and transmitter on line, select 'Calibration Gas' in
function #23 (32) and 'Automatic' in function #24 (33) and then set the times in function #25 (34) to #28 (37)
and the gas levels in function #29 (38) to 31 (40).
If the transmitter measurement does not fall within the limits set in function #30 (39) to 31 (40) a 'Gas1 (2)
Calibration Error' alarm will be generated.
If the transmitter has 'Automatic' selected in function #24 (33) and one of the GAS/PURGE button is pressed
in Run Mode, the automatic cycle will be started and the alarms will be checked. The cycle can be stopped
at any time by pressing the same button during the cycle.
August 2018
1732 Oxygen Transmitter
11. G
C
AS
Available if 'Solenoid Operation' is set to 'Purge' and 'Automatic'
Available if 'Solenoid Operation' is set to 'Calibration Gas' and 'Automatic'
C
ALIBRATION
Options
Disabled / Calibration Gas / Purge
Automatic / Manual
00:00 to 23:45
1 hour – 7 days
1 – 90 seconds
5 – 300 seconds
0.1 – 20.9%
0.1% to 3.0%
0.1% to 3.0%
P
HECK AND
URGE
Technical Manual
57
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