BA 4510
5 Operation and Parametrisation
5.1 Operation
5.1.1 Switching On and Measurement Display
After preparing the inert gas measuring device for operation and installing all lines, the device can be switched on. The measur-
ing cell reaches its operating temperature of 750 °C (1382 °F) after approx. 10 minutes. The current measured value will be dis-
played but will not be within the specified error limits until the thermal conditions inside the measuring cell are completely bal-
anced, after about one hour.
The device enters display mode after being switched on. The display shows the value programmed in the output (typically the
current oxygen concentration) according to the selected dimension (Vol.% or ppm).
5.1.2 Setting the Sample Gas Flow Rate
NOTICE
To ensure exact measurements, set the flow rate to 5 ... 10 L/h. When measuring by by-
pass, the flow rate is controlled by the internal pump.
In the event of sample gas overpressure, the manufacturer recommends installing a high-quality needle valve directly at the gas
inlet of the device. Suitable needle valves are available from the manufacturer of the device. If higher pressure occurs, a pressure
regulator should be installed upstream to regulate its output pressure to approx. 100 kPa (1 bar) overpressure.
5.1.3 Measurement Monitoring
The device can be programmed for a limit, which sends alerts via relay output. The relay is open when active. (If a limit is activ-
ated this status will also appear in the status line). This signal is delayed. The response time for measurement monitoring (limit
delay) can be set to 1 to 99 seconds.
5.1.4 Status/Error Messages
Measuring cell functions are monitored during the measuring process. In the event of a failure/error, error messages are out-
put. At the same time the relay output is activated to indicate a fault.
Status
Display
Note
0
OK
1
LIMIT
2
RANGE<<<
3
RANGE>>>
4
FLOW<<<
< 5 L/h
5
FLOW>>>
> 10 L/h
6
7
8
9
WARM UP
Cell temperature too low (wait, after approx. 15 minutes 750 °C (1382 °F) must be reached)
10
CELL TEMP.<<<
Set temp -10° and >30 min
11
THERMOCOUP. ERROR
Thermocouple defect
12
13
14
SYSTEM ERROR
Status 1...8: Warnings, only alarm relay active
Status 9...14: Error, alarm relay active and current signal zero
13
Bühler Technologies GmbH
BE550013 ◦ 09/2018
