visiferm™ do sensors - Forbes Marshall

VISIFERM DO Operating Instructions
configured the ECS interface completely. The above values
correspond to a typical OXYFERM oxygen sensor with 60 nA at air
and at a temperature of 25°C.
HINT: If you input ‘256’ instead of ‘512’ in the 2nd step, then the current
corresponding to the value in the field ‘Fixed test value’ is supplied over the
ECS interface! This would be 80 nA in our example. This test mode is helpful
in order to test the ECS interface, the cable and the oxygen measuring device!
Activation of the 4-20 mA mode
Configure the sensor with VisiConfigurator as follows:
1. At first, it is essential to adjust the right measuring value (vide infra)!
In the following we assume that you have decided for the
measurement in %-oxygen air saturation (%-sat). The adjustments
for the other measured values take place in a similar way.
2. If you are not yet on the specialist level already: User Level /
Command: Change user level / New user level: S / Password: see
table above / Go. Now a ‘S’ has to appear on the right side in the
field ‘New user level’. Thus you have the user rights of a specialist
and may reconfigure the sensor!
3. Configuration Interface / Command: Write current interface mode /
Interface: 2 / Go. Now a ‘2’ has to appear on the right side of the field
‘Interface’. Thus you have deactivated the ECS interface and
activated the 4-20 mA interface. Now the 4-20 mA interface has to be
adjusted!
4. As an example, 4 mA 0% and 20 mA 160% oxygen air saturation
shall be assigned. Configuration Interface / Command: Write
configuration 4…20 mA interface / Oxygen value at 4mA: 0 / Oxygen
value at 20mA: 160 / Fixed test value: 10 / Go. Now the same values
have to appear again on the right side. Furthermore, the measuring
unit is displayed for control. Thus you have configured the 4-20 mA
interface completely.
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