21
9900 Transmitter
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 de
fi
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.
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.
Time
High Limit
Hysteresis
Low Limit
Process
Window
Window OUT example
10
5
Open Collector Output Rate:
0 to 100 Pulses/min.
Pulse rate
0 pulses
100 puls
Starting point
Endpoint
100 pulses
Relay energized
Relay de-energized
Time
High Limit
Hysteresis
Low Limit
Process
Window
Hysteresis
Window IN example
Relay Outputs
