Specifications – Watlow Series 142 User Manual

Page 5

Watlow Series 142

User’s Manual

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(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 relay1, SPDT, 3A @ 120/240V~ or 3A @

30V

(dc), Form C, with RC suppression on on-off temperature

controller version. Off-state output impedance is 20k

Ω

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.)

1Electromechanical 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.

Specifications