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.
- Select .
- Select the relay that you want to configure, either RELAY 1 or RELAY 2.
To assign the current relay to either sensor A or sensor B, select 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 FUNCTION.
Function name Description 1
Closed contact if diagnostic message is NORMAL OPERATION during HOLD, see Configuring input switches. The contact is also closed when message is NO SAMPLE.
Closed contact if there is no equipment malfunction. See also Diagnostic message priorities.
Used as alarm relay, closing contact if source value is below set limit. (See below for limit source selection.) 5
Used as alarm relay, closing contact if source value is above set limit. (See below limit source selection.) 6
See Wash cycle. 7
See Configuring prism wash. 8
PRISM WASH FAILURE
Closed contact if diagnostic message is PRISM WASH FAILURE, see Setting prism wash parameters.
If you choose either low limit or high limit as relay function, you must define a limit
source. To set the limit source, select
.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 , and enter a numeral limit value.
To set the hysteresis value select
. 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
. The delay is given in seconds, factory setting is 10 s.
For manual set, go back to the Select relay menu and
choose 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.