67
8014084/ZWT7/V3-1/2020-06 | SICK
O P E R A T I N G I N S T R U C T I O N S | TRANSIC111LP
Subject to change without notice
ADJUSTMENT
6
6.1.2
Calibration and adjustment in the process
▸
The TRANSIC111LP does not have to be removed from the process with this adjustment
method.
▸
Feed the span gas through the optional test gas inlet in the bottom of the electronics
housing of the measuring device.
Typical calibration accuracy is within ±0.2% O
2
for a reference volume flow of 5 ... 9 l/min.
Calibration uncertainty increases when the volume flow is significantly below 5 l/min.
The effect of the process gas flow rate (in the range 0 ... 20 m/s) on adjustment precision
is negligible. Adjustment precision decreases with a high process gas flow rate.
The strength of unwanted counter diffusion through the filter depends on the O
2
concentra-
tion difference between span gas and process gas. For example, if you are using 100%N
2
as a reference and the process gas has 2% O
2
, the result is better than when the process
gas has 21% O
2
.
6.1.2.1
Connections and systems
The calibration gas inlet of the TRANSIC111LP is fitted with a Swagelok screw fitting for
pipes with 6 mm outer diameter. A non-return valve with an opening pressure of
approx. 1.7 bar is used. The first opening pressure can be higher than 1.7 bar when the
non-return valve has not been used for some time. SICK therefore recommends using a
flow monitor, e.g., a rotameter, to monitor the calibration gas flow. This allows to set the gas
flow to the required value.
6.1.2.2
Connecting the gas
1
Remove the plug of the TRANSIC111LP gas inlet.
2
Fasten the span gas tube to the gas inlet using a 14 mm wrench. Do not overtighten the
inlet.
NOTICE:
For adjustment in process, fit an optional test gas inlet and PTFE filter
on the TRANSIC111LP.
NOTICE:
The PTFE filter is not suitable for >25 vol% oxygen.
WARNING:
Risk of injury through pressure
The device may burst or leak when the process pressure is too high.
▸
Pay attention to the specifications for the flange variants and sample gas cell,
“Pressure suitability”, page 103
●
Use a sufficiently high volume flow for optimum adjustment results.
●
With low span gas volume flow, high adjustment precision is only achieved with
process gas flow rates near zero.
WARNING:
Escaping span gas can enter the process
▸
Ensure the span gas is compatible with the process gas.
NOTICE:
Prevent contamination of the gas inlet
If span gas is not connected:
▸
Use a plug for the optional gas inlet of the TRANSIC111LP.
This prevents dust or dirt depositing on the gas inlet.
NOTICE:
Prevent process gas escaping
If span gas is not connected:
▸
Use a plug for the optional gas inlet.
Although the non-return valve prevents process gas from escaping, the plug on the
optional TRANSIC111LP gas inlet can also be used.
