Example: Control incubator temperature, alarm over-temperatures, record on chart recorder
Application: Using an ANSI Platinum RTD as the sensor, control a heater to maintain the tem-
perature of an incubator at 99.0±0.5°F. Use 4-wire connection. Output temperature to an analog
chart recorder so that 0V = 95°F and 10V = 105°F. Alarm temperatures of 102°F or higher.
Solution:
• Jumper signal conditioner for Pt100 and 2 or 4-wire connection.
• Under “Input+Display” tab, set Mode to RTD, Range to “ANSI deg F”, Resolution to 0.1 deg,
and “50/60 Hz Line Freq” to 60 Hz to reject 60 Hz noise.
• Under “Relay Alarms” tab, select “Split Hysteresis” with a setpoint of 99.0°F and a deviation
of 0.5°F for Alarm 1, which will control the heater. Select a setpoint of 102.0°F for Alarm 2,
which will be used to alarm over-temperatures.
• Under “Analog Out” tab, set Range to “0-10V Voltage”, “Lo Range Reading” to 95.0°F and
“Hi Range Reading” to 105.0°F.
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