Appendix 1, Specifications, Specification – Watlow Series 942 User Manual
Page 46
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
°
F
or
425
to 2315
°
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 20K
Ω
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 20K
Ω
min.
•
Switched DC Open collector, 500
Ω
minimum load resistance, 1K
Ω
load,
9mA minimum, 22mA maximum, non-isolated.
•
0-20mA or 4-20mA reverse or direct into a 600
Ω
maximum load impedance,
non-isolated.
•
0-10VDC or 0-5VDC reverse or direct into a 1K
Ω
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: