Signet 9900 Operating Instructions Manual page 21

Relay Outputs
Window In/Out:
Relay is on when the value is higher or lower than the high or
low setpoint.
WINDow IN = relay on if measurement is inside the window
of two setpoints. Measurement inside the two setpoints is
abnormal condition.
WINDow OUT = relay on if measurement is outside the
window of two setpoints.
Proportional Pulse Operation:
The transmitter can output a pulse at the rate defi ned by the
settings in the CAL menu and the sensor input. The maximum
pulse output from the relays is 300 pulses per minute.
Example usage would be to control solenoid-operated
dosing pumps.
For example: As the process value drops below the setpoint,
the output will start pulsing in relation to the process value,
the maximum pulse endpoint and the programmed
pulses/minute. The pulse rate will change as the process
value changes and approaches the programmed endpoint.
This functionality can be used to precisely control the process.
The starting point, endpoint and maximum pulse rate are
select able in the RELAY menus.
NOTE: Relay LEDs are not lit in PULSE mode.
Process
High Limit
Window
Low Limit
Window IN example
Relay energized
Relay de-energized
Process
High Limit
Window
Low Limit
Window OUT example
0 pulses
5
Starting point
In the example:
• The output will be 0 pulses/min. when value is less
than 5.
• The output will be 50 pulses/min. when value is 7.5.
• The output will be 100 pulses/min. when value is
greater than 10.
Hysteresis
Hysteresis
Time
Hysteresis
Time
100 pulses
100 puls
10
Endpoint
9900 Transmitter 21