Appendix
42
WATLOW Series 945 User's Manual
Specifications
Secondary Output (Heat, Cool or None)
• Solid state relay, Form A, 0.5A @ 24VAC min., 264VAC
maximum, opto-isolated, zero cross switching. Off state
impedance is 20KΩ minimum for 945A-XBXX-X000
units, and 31MΩ for 945A-XKXX-X000 units.
• Electromechanical relay, Form A, 6A @ 120/240VAC, 6A
@ 28VDC, 1/8 hp. @ 120VAC, 125VA @ 120VAC. Off
state impedance is 20KΩ min. Typical relay life is
100,000 cycles.
• Switched DC (Open collector), 500Ω min. load resis-
tance, 1KΩ load, 9mA min., 22mA max., non-isolated.
Alarms
• Electromechanical relay, Form A (N.O.) or B (N.C.), 6A
@ 120/240VAC, 6A @ 28VDC, 1/8 hp. @ 120VAC,
125VA @ 120VAC. Off state impedance is 20KΩ min.
Typical relay life is 100,000 cycles.
• Latching or non-latching.
• Process or deviation.
• Separate high and low values.
• Alarm silencing (inhibit) on power up for Alarm 1.
Retransmit Output
• 4-20mA into a 600Ω maximum load, non-isolated.
• 0-5VDC into a 10KΩ minimum load, non-isolated.
• Retransmit of process or set point. User selectable range.
Accuracy
• Calibration Accuracy & Sensor Conformity: ± 0.1% of
span, ± 1LSD, 77°F ± 5°F(25°C ±3°C) ambient & rated
line voltage ±10%.
• Accuracy Span: 1000°F or 540°C minimum.
• Temperature Stability: 0.1°F/°F (0.1°C/°C) change in
ambient.
• Voltage Stability: ± 0.01% of span / % of rated line
voltage.
Communications
• Serial data communications.
• RS-422A or RS-423A (RS-232C compatible) or EIA-485.
• ANSI X3.28 protocol, or XON/XOFF protocol.
• Isolated.
• Data logging.
• #6 compression type screw terminals.
Agency Approvals
• UL recognized, File #E43684, UL873.
• CSA recognized, File # LR30586.
Terminals
• #6 compression type screw terminals.
Power
• 120/240VAC +10%, -15%, 50/60Hz, ± 5%.
• 16VA maximum.
• Data retention upon power failure via nonvolatile
memory.
Operating Environment
• 32 to 149°F/0 to 65°C.
• 0 to 90% RH, non-condensing.
Dimensions
• Height: 3.8 in 97 mm
• Width: 3.8 in 97 mm
• Overall depth: 7.0 in 178 mm
• Behind panel depth: 6.0 in 153 mm
• Weight: 2.5 lb max. 0.4 kg
Control Mode
• Single or dual set point, non-ramping.
• Single input, dual outputs, dual alarms.
• Optional retransmit of set point or process variable.
• Control outputs: User selectable as: Heat, Heat/Heat,
Heat/Cool, Cool, Cool/Cool, Cool/Heat.
• Outputs independent, or related via deadband for
Heat/Cool.
• ON/OFF: Determined by the HYSX parameter for
Outputs 1 and 2.
• Proportional band: 0 to 999°F/0 to 555°C/0 to 999 U
or 0 to 999.9% 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, ±99 units or ±55°C (±9.9°F, ±9.9
units or ±5.5°C for rtd.1 and process units)
Operator Interface
• Membrane front panel.
• Dual, four digit 0.56" (14 mm) LED displays.
• MODE, AUTO/MANUAL, UP, and DOWN keys.
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 or selectable bumpless transfer to
manual operation.
• Grounded or ungrounded sensors.
• °F,°C, or process variable units are user selectable.
• Operating ranges 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 to2315 °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: 1598 to 3092°F or 870 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 to200.0°C
0-5VDC: -500 to 3500 units
4-20mA: -500 to 3500 units
Primary Output (Heating or Cooling)
• Solid state relay, 0.5A @ 24VAC min., 264VAC max.
opto-isolated, zero cross switching. Off state impedance
is 20KΩ min. for 952A-XBXX-X000 units, and 31MΩ
for 945A-XKXX-X000 units.
• Electromechanical relay, Form C, 6A @ 120/240VAC, 6A
@ 28VDC, 1/8 hp. @ 120VAC, 125VA @ 120VAC. Off
state impedance is 20KΩ minimum. Typical relay life of
100,000 cycles.
• Switched DC (Open collector), 500Ω min. load resis
tance, 1KΩ load,9mA min., 22mA max., non-isolated.
• 4-20mA reverse or direct acting into a 600Ω maximum
load impedance,non-isolated.
• 0-5 VDC reverse or direct into a 1KΩ minimum load
impedance, non-isolated.
(1359)
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