Operational Characteristics
18
— This signal is maintained for 30 seconds. The gas transmitter will then switch
back to normal operation.
— The central device display now matches the output signal of the gas transmitter.
Reactivate alarm activation of the central device.
Changing the gas category
The gas transmitter supports the linearized and temperature compensated display
of a wide spectrum of gases and vapours. Depending on the measured gas, you
can select one of the three gas categories "methane", "propane" or "ethylene"
stored in the software. A table which allocates a row of checked gases and vapours
is available in the table "Substitute Gas Calibration" on page 16.
Changing the gas category is only possible under the following conditions:
— The device was less was started up less than an hour ago.
— The last zero calibration of the gas transmitter was less than an hour ago.
— The gas concentration measured by the device is below 10 %LEL (expose to
zero gas if necessary).
To change the gas category of commissioned gas transmitters, interrupt the power
supply for a short period of time, wait for the running-in period of one minute to
expire, and then carry out an automatic zero calibration (see "Automatic Zero
Calibration" on page 13).
Then:
Deactivate alarm activation of the central device.
Place the magnetic pin onto the transmitter surface area marked by the " "
icon (within the black frame) and hold it there.
After ten seconds, the output signal of the gas transmitter changes to 16.8 mA
(80% signal) and remains there for as long as the magnetic pin is held against it.
NOTICE
Using the 80% signal to match central device and transmitter signal without test
gas is no replacement for the span calibration of the gas warning system.
To Next Page
Loading...
Need help?
General
