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Appendix, Specifications, Appendix series 920 specifications – Watlow Series 920 Microprocessor-Based Ramping Control User Manual

Page 59: Mode, Control, Input

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Appendix

Series 920 Specifications

Control

Mode

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Microprocessor-based, user selectable modes.

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Single input, dual control outputs, dual auxiliary outputs.

.

99 step programmer with up to 10 profiles.

l

Control outputs: User selectable as: Heat, Heat/Cool, Cool, Cool/Heat.

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Outputs independent, or related via dead band.

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ON/OFF: 3°F (1.7°C) switching hysteresis.

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PID parameters.

Proportional band: 0 to 900°F (0 to 500°C), or 0 to 500 units, 0.0 to 90.0°F

(0.0 to 50.0°C) for 0.l° RTD inputs.
Reset: 0.00 to 5.00 repeats per minute.
Rate: 0.00 to 5.00 minutes.

Rate band: 0 to 7 times proportional band.

Cycle time: 1 to 60 seconds.

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Deadband: ±36°F ±20° C), ± 20 units.

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Auxiliary outputs: User selectable as:

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Event per step or alarm.

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Process or deviation value per output.

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Latching or non-latching.

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Separate high and low values per output.

Operator interface

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Membrane front panel.

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Four digit 1/2” (13 mm) LEDs display actual process input value.

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LED indication of °F, °C, or process variable units.

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MODE, ENTER, UP, DOWN, and RUN/HOLD keys.

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Eight character alphanumeric display of operating data.

Input

Thermocouple, RTD and electrical process input.

Lead resistance effect for “J” type thermocouple input: 2OO ohm of lead resis-

tance will cause less than 1°F error. Refer to the lead wire manufacturer’s

specification on ohms per double foot for the type and gauge of wire used.

Automatic cold junction compensation for thermocouple.

RTD input 2 or 3 wire, platinum, 100 ohms @ 0°C, calibrated to JIS curve #3916

(0.003916 ohms/ohms/°C or DIN curve #3850 (0.003850 ohms/ohms/°C

Se lectable in the RTD parameter under the SPCLFUNC menu

Sensor break protection de-energizes control outputs to protect system.

Isolated or grounded sensor. Isolated sensors must be used with process

inputs or outputs.

100K ohms input impedance for 0-5 volt input.

250 ohms input impedance for 4 - 20mA input.

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Operating ranges user selectable.

J t/c:

32 to 1382°F or

0 to 750°C

K t/c:

- 3 2 8 t o 2282°F or -200 to 1250°C

T t/c:

-328 to 662°F or -200 to 350°C

R tic:

32 to 2642°F or

0 to 145O°C

S t/c:

32 to 2642°F or

0 t o 1450°C

B t/c:

3 9 2 t o 3092°F o r 2 0 0 t o 1700°C

1° RTD:

-328 to 1112°F or -200 to 600°C

0.1° RTD: -99.9 to 392.0°F or -99.9 to 200.0°C
0-5VDC:

-99 to 1800 units

4-20mA:

-99 to 1800 units

WATLOW Series 920 User’s Manual

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