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Watlow Series 142 User’s Manual ■ 5
(2072)
Limit Control Mode
• High limit control
• Latched manual reset with ±1.7°C (3°F) hysteresis
• Can only be reset when process temperature drops below limit
set point. Terminals are provided for remote reset in the event of
an overtemperature condition. (Reset switch supplied by user.)
On-off Temperature Control Mode
• Off — when process temperature exceeds factory-fixed or remote
adjustable set point
• On — when process temperature is less than factory-fixed or
remote adjustable set point
• Hysteresis (switching differential) ±1.7°C (3°F) nominal
Agency Approvals
• and , File #E43684
197 Commercial Cooking Appliances
873 Temperature Indicating and Regulating Equipment
991 Test for Safety Related Controls Employing Solid State
Devices
• #C3236001 approved, Gas Appliance Thermostat, ANSI
Z21.23
• CE 89/336/EEC Electromagnetic Compatibility Directive
EN61326, Immunity, Class B Emissions
• CE 73/23/EEC Low Voltage Directive
EN60730-1, EN60730-2-9, Safety
Operator Interface
• Non-adjustable, factory-fixed or remote adjustable set point
Remote Set Point
• Dial scale calibrated to compensate for sensor non-linearity
• Dual °F/°C scales
Accuracy
Adjustable Set Point
• Calibration accuracy: ±1% of span, at 25°C ±3°C (77°F ±5°F)
ambient and rated line voltage ±1%
• Set point accuracy: ±3% of dial scale
• Accuracy span: 540°C (1000°F) minimum
Fixed Set Point
• Calibration accuracy: ±6°C±/10°F of setting, at 25°C ±3°C (77°F
±5°F) ambient and rated line voltage ±1%
Thermocouple Stability
• Thermocouple: Typically 9µV/°C ambient (±5µV/°F ambient) input
referenced
• RTD: Typically 0.2°C/°C ambient (0.2°F/°F ambient)
Voltage Stability
• ±0.01% of span (min span of 540°C or 1000°F) per % of rated
line voltage
Thermocouple Input
• Grounded or ungrounded Type E, J, K or T. Sensor break
protection de-energizes output.
• Factory-set, thermocouple ranges
Output
• Electromechanical relay
1
, SPDT, 3A @ 120/240V~ or 3A @
30VÎ (dc), Form C, with RC suppression on on-off temperature
controller version. Off-state output impedance is 20kΩ with RC
suppression.
Output Relay Status Upon Power Restoration
(Assuming process temperature is not above set point.)
• Auto reset: Output relay automatically re-energizes
• Manual reset: Manual reset is required to re-energize output relay
Line Voltage/Power
• 120V~, ±10%; (108-132V~), 50/60Hz, ±5%
• 208/240V~, ±10%; (187-264V~), 50/60Hz, ±5%
• Power consumption 4VA maximum
Operating Environment
• 0 to 65°C (32 to 149°F)
• 0 to 90% RH, non-condensing
Storage Temperature
• -40 to 85°C (-40 to 185°F)
Terminals
• 1⁄4 inch quick connect lugs (spade/ appliance)
Dimensions
Controller
• Length 102mm (4 in.)
• Width 70mm (2.8 in.)
• Height 103mm (4.05 in.)
• Controller Weight 0.36kg (0.79 lb.)
• Shipping Weight 0.57kg (1.25 lbs.)
Set Point Assembly
• Dial Scale 76mm (3 in. sq.)
• Pot Depth Behind 25mm (1.0 in.)
• Knob Depth in Front 31mm (1.2 in.)
• Lead Length 610mm (24 in.)
• Weight 0.09kg (0.2 lb.)
1
Electromechanical relays are warranted for 100,000 closures
only.
UL® is a registered trademark of Underwriter’s Laboratories, Inc.
Note: Specifications subject to change without notice.
US
®
Specifications