For the electrical properties of the
built-in relays, see Connecting indicating transmitter. You can configure each of the 2 relays individually to either sensor A or
sensor B, meaning 0 to 2 relays can be assigned to a sensor. You can also open and close
relays manually, mainly to test them.
Figure 1. Relay menu for relay 1
Select Menu > 5 CALIBRATION > 3 RELAYS.
Select the relay that you want to configure, either 1 RELAY 1 or
2 RELAY 2.
To assign the current relay to either sensor A or sensor B, select 1
SENSOR.
The current assignment of
the relay is shown at the bottom of the Relay menu display. In
the figure, relay 1 is assigned to sensor A with function Low limit.
To set the relay function, select 2 FUNCTION.
Function name
Description
1
NOT DEFINED
Factory setting.
2
NORMAL OPERATION
Closed contact if diagnostic
message is Normal operation during HOLD, see Configuring input switches. The contact is also closed when message is NO SAMPLE.
If you choose either low limit or high limit as relay function, you must define a limit
source. To set the limit source, select Relay > 3 LIMIT SOURCE.
Limit source selection:
Function name
Description
1
NOT DEFINED
Factory setting.
2
CONCENTRATION
Measured concentration CONC
3
PROCESS TEMPERATURE
Process temperature
To set the limit value select Relay > 4 LIMIT VALUE, and enter a numeral limit value.
To set the hysteresis value select Relay > 5 HYSTERESIS.
The hysteresis value indicates how soon the relay opens after the process has
temporarily gone over the high limit or under the low limit. For example, if high limit is
50 and hysteresis is 2, the relay opens only once the process drops to below 48.
To change the relay delay time, select Relay > 6 DELAY.
The delay is given in seconds, factory setting is 10 s.
For manual set, go (back) to the Select relay menu and
choose 3 MANUAL SET.
In the manual set display you can open
and close any relay by pressing the appropriate soft key. The current status of the
relay (open or closed) is displayed next to the relay name.
