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Curtis resistance sensing amplifier for
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photoelectric, temperature and process control
Model PCT
Features
s Zener Diode-Regulated Power Supply Limits Operating Point
Variations to Less than 0.5%
s Standard Adjustable Resistance Sensing Range is Sensitive to
100,000 ohms but can be extended to 250,000 ohms
s Has Provision for Remote Potentiometer Adjustment of Operat-
ing Setpoint as well as Built-In Time Delay which can be
Modified to Meet Individual Customer Specifications
s May be Wired for Light or Dark Energizing Operation
s Circuit Design Limits Short Circuit Transducer Current to a
Maximum 4MA/9VDC
s Auxiliary Contactor Available for Loads Exceeding Capacity of
Plug-in Relay
s Differential Adjustment Provided
s Auxiliary Contactor Available for Loads Exceeding Capacity of
Plug-in Relay
Outline and Mounting Dimensions
Operation
Specifications
Model Input Supply
Input Supply : PCT-1 120VAC, 50/60 Hz
PCT-2 240VAC/ 50/60 Hz
PCT-3 24VAC, 50/60 Hz
Maximum Allowable Supply Voltage Variation : ± 10%
Maximum Power Consumption : 3.5 Watts
Detectable Range : Up to 100,000 ohms Standard; may be extended to 250,000
ohms
Adjustable Range : 1,000 to 100,000 ohms Standard; 1,000 to 250,000 ohms for
extended sensitivity circuits
Operating Point Differential : 1% (With Sensing Element Resistance Above 15k
ohms) Typical
Maximum Signal or Probe Voltage (Element Exhibiting Infinite Resistance) : 9VDC
Maximum Signal or Probe Current : 4MA
Control Relay : DPDT Plug-In Type with Cover
Load Contacts : 1/6 HP, 10 amp, Non-inductive/120VAC; 1/3 HP at 230VAC
Ambient Operating Temperature : -25° F to +140° F
Standard Termination : Barrier-Type Terminal Blocks.
Accepting Wire up to No. 12AWG
Mounting Style : Flange
Model PCT control may be wired to energize the control relay following
either an increase or a decrease in external circuit resistance. Unit pro-
vides a .25MA/9VDC signal to a variable resistance sensing element. A
control-mounted potentiometer allows adjustment of pull-in or drop-out point.
The unit has provision for extension of the operating point as well as re-
mote potentiometer adjustment. A built-in time delay eliminates false
riggering due to minor sensing element impulses. Standard response time,
typically 100 milliseconds, can be altered by changing the value of capaci-
tor C 2 . Provides a response time of 10 to 15 milliseconds.
Ordering
Information
Typical Curtis Model Number
Basic Amplifier Type (Also refer to “Specifications”
PCT-1 -
-
above)
Contactor (if desired add “C”)
Enclosure – specify only if necessary
(N3 – NEMA 3, N3C – NEMA 3/
Contactor, N4 – NEMA 4 JIC
The composite number above reads as a “PCT amplifier for 120VAC supply without contactor and less enclosure.” Contact factory for additional information.
For further information on catalog listed controls contact your area Curtis representative or Curtis distributor.
For custom design or modification contact your area Curtis representative or the factory direct.
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