CPT 1A Capacitance Position Transmitter
● The CPT 1A contactless position transmitter operates on a capacitance principle and converts the
angular position to a unified current signal of 4 ÷ 20 mA;
● The standard operating range of 120° may be simply changed to 60° to 120° range by means of a
multiturn trimming potentiometer;
● Outstanding features include: high accuracy, small dimensions, long service life, and arbitrary operating position;
● Another advantage is the two-wire connection and continuous output signal;
● The CPT 1A may be used not only in actuating mechanisms, but also wherever angle sensing is needed with a low torque moment.
The CPT 1A Capacitance Position Transmitter specifications .
Turning the sensor spindle changes the capacity of the plate condenser which is converted to a current signal of 4 to 20 mA by the
electronics located inside the transmitter. The standard working
range of 120° may be adjusted via a multiturn trimming potentiometer from 60° to 120° at the output current signal of 4 to 20 mA. The
other characteristic branch, 20 to 4 mA, may be used simply by rotating the transmitter spindle by 180°.
The transmitter is supplied by a DC power source with voltage in the
range of 18 ÷ 28 V without a voltage stabilization requirement at a
resistance load of 500 Ω. The transmitter connection is made by
two wires serving at the same time powering the electronics inside
the transmitter and returning current signal, so that no other wires
are necessary for the supply. Since the case is isolated from the electronics by galvanization, several transmitters may be connected to
one power supply. The recommended power supply unit is delivered
under the ZPT 01 designation.
The standard CPT 1A position transmitter comes equipped with a UF
450 high-frequency filter to suppress interference incurred by radio
stations and cellular phones in the 27; 450, and 900 MHz bands.
The electronics include a current limiter and protection against reversal of polarity. The surface mounting technology provides high shock
resistance.
Transmitter is Supplied in the Following Versions .
CPT 1A
standard (working temperature –25°C to +60°C,
temperature dependence 0.5% at 10° C)
CPT 1AV option (working temperature –25°C to +60°C,
temperature dependence 0.3% at 10° C)
CPT 1AT for high temperatures (working temperature –25°C to +80°C,
temperature dependence 0.5% at 10° C)
CPT 1AF for low temperatures (working temperature –40°C to +40°C,
temperature dependence 0.5 % at 10° C)
CPT 1AM salt-fog resistant (working temperature –25°C to +60°C,
temperature dependence 0.5 % at 10° C)
CPT 1AG with higher seismic resistance
(f = 1 ÷ 12.5 Hz, amplitude swing sa = 25 mm;
f = 12.5 ÷ 50 Hz, acceleration a = 8 g;
working temperature –25°C to +60°C,
temperature dependence 0.5% at 10° C)
This line of weather-proof and rugged CPT 1A capacitance position
transmitters are also supplied in as a three-wire version with an output signal 0 ÷ 20 mA or 0 ÷ 5 mA. By agreement with the producer,
some versions may also be combined.
The CPT 1A capacitance position transmitters may also be equipped
with supplementary adapters to replace older OV 100, ARIPOT, and
INPOS transmitters without modification of the existing equipment.
36
20h7
3j6
+
CPT 1A
red (+)
black (-)
Rz = 500 Ω
4÷20 mA
6
3x2
25
47
+
18÷28 V 230 V/50 Hz
-
14
40
CPT 1A Performance Data .
Output signal
4 ÷ 20 mA (20 ÷ 4 mA) at working angle of 60° to 120°
Power supply
18 ÷ 28 V at Rz = 500 Ω
Linearity
≤1%
Temperature dependence
0.5 % at 10 °C (option: 0.3 at 10 °C)
Load resistance
Rz = 0 to 500 Ω
Supply voltage effect
0.02 % at 1 V
Load resistance effect
0.02 % at 100 Ω
Electric strength of galvanic isolation
50 V per 1 min
Required torque
0.6 Ncm
Service life
108 turns at 120°
Weight
60 g
Working temperature (standard)
–25 °C to 60 °C
Humidity
30 to 95 %
Vibration
1 ÷ 120 Hz, a = 0.75 g
Seismicity
1 ÷ 35 Hz, a = 2 g
External magnetic and electric fields
max. 400 A/m2 (according to CSN 18 00 02, Art. 3, 6)
Enclosure
IP 43
Barometric pressure
86 to 106 kPa
DICONT a.s., Prvního pluku 347/12a, 186 00 Praha 8 - Karlín, Czech Republic
Tel.: +420 2 24 816 850, Fax: +420 2 24 816 859, e-mail: dicont@dicont.cz
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