Hach-Lange POLYMETRON 9500 User Manual - Manual (Page 31)

Bilinear output mode
Figure 15 shows in graph form the operation of the bilinear output mode.
Figure 15 Bilinear output
1 Output current axis 4 Knee point value 7 Knee point current
2 Source value axis 5 Low value 8 Maximum output current
(20 mA)
3 High value 6 Minimum output current
(0-4 mA)
Configure relays
The Normally Open (NO) and Common (COM) relay contacts will be connected when an alarm or
other condition is active. The Normally Closed (NC) and Common relay contacts will be connected
when an alarm or other condition is inactive (unless the FAIL SAFE is set to YES), or when power is
removed from the controller. To select a menu option, highlight the option and push enter.
1. Push the menu key and select Polymetron 9500 SETUP>RELAY SETUP.
2. Select a relay from the list.
3. From the RELAY SETUP menu, choose SELECT SOURCE and push enter. Normally, a source
is one of the sensors attached to the system, but the controller can also function as a source. If
an analog input module is installed, the source may be the analog input.
4. From the RELAY SETUP menu, select SET PARAMETER and choose from the list of
parameters. The list of parameter options will vary with the type of attached sensor.
5. From the RELAY SETUP menu, select SET FUNCTION and choose from the list. Further setup
will depend on the function chosen.
Option Description
SCHEDULER (available if the
controller is selected as the
relay source) Relay switches at certain times independently of any process value
ALARM Relay activates when upper or lower alarm value is exceeded
FEEDER CONTROL Relay indicates if a process value exceeds or falls below a setpoint
EVENT CONTROL Relay toggles if a process value reaches an upper or lower limit
English 29