46
WATLOW Series 942 User's Manual Appendix
NOTE:
An X applies to
either Hysteresis 1,
2, 3, or 4.
Specifications
Appendix 1
Control Mode
• 24 step ramping control or programmer.
• Simple, non-ramping set point.
• Single input, dual outputs.
• Optional dual auxiliary outputs, selectable as alarms or time based events.
• Optional retransmit of set point or process variable.
• RS-422A, RS-423A, or EIA-485 data communications available.
• Control outputs: User selectable as: Heat, Heat/Cool, Cool, Cool/Heat
• Outputs independent, related via dead band for Heat/Cool.
• ON/OFF: Selectable per Outputs 1 and 2.
• Proportional band: 0 to 999°F/0 to 555°C/0 to 999 Units or % of span
Reset: 0.00 to 9.99 repeats per minute.
Integral: 0 and 00.1 to 99.9 minutes per repeat.
Rate/Derivative: 0.00 to 9.99 minutes.
Cycle time: 1 to 60 seconds.
• Dead band: ± 99°F, ± 55°C or ± 99 Units
(± 9.9°F, ± 5.5°C or ±9.9 units for rtd.1 and process units)
Operator Interface
• Membrane front panel.
• Dual, four digit 0.56" (14 mm) LED displays.
• MODE, HOLD/RUN, UP, and DOWN keys.
Input
• Thermocouple, RTD, and electrical process input.
• Automatic cold junction compensation for thermocouple.
• RTD input 2 or 3 wire, platinum, 100 ohm @ 0°C, software selectable:
JIS curve #3916 (0.003916 Ω/Ω/°C) or DIN curve #3850 (0.003850 Ω/Ω/°C).
• Sensor break protection de-energizes control outputs to protect system.
• Grounded or ungrounded sensors.
• °F, °C, or process variable units are user selectable.
• J t/c: 32 to 1382°F or 0 to 750°C
K t/c: -328 to 2282°F or -200 to 1250°C
T t/c: -328 to 662°F or -200 to 350°C
N t/c: 32 to 2282°F or 0 to 1250°C
C t/c: 797 to 4200°For425to2315 °C
PT 2 (Platinel 2) 32 to 2543°F or 0 to 1395°C
R t/c: 32 to 2642°F or 0 to 1450°C
S t/c: 32 to 2642°F or 0 to 1450°C
*B t/c: *32 to 3092°F or 0 to 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: -500 to 3500 Units
4-20mA: -500 to 3500 Units
Primary Output (Heating or Cooling)
• Solid state relay, Form A 0.5A @ 24VAC min., 264VAC maximum, opto-
isolated, zero cross switching. Off state impedance is 20KΩ minimum for
942A-XBXX-X0000 units, and infinite impedance for 942A-XKXX-X000 units.
• Electromechanical relay, Form C, 6A @ 120/240VAC, 6A @ 28VDC,
1/8 hp. @ 120VAC, 125VA @ 120VAC. Off state impedance is 20KΩ min.
• Switched DC Open collector, 500Ω minimum load resistance, 1KΩ load,
9mA minimum, 22mA maximum, non-isolated.
• 0-20mA or 4-20mA reverse or direct into a 600Ω maximum load impedance,
non-isolated.
• 0-10VDC or 0-5VDC reverse or direct into a 1KΩ minimum load impedance,
non-isolated.
* B t/c: Useable
range is suggested
to be 1598 to 3092°F
or 870 to 1700°C.
Range is at 32° to
allow using at low
temperatures
without range low
sensor errors.
NOTE:
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