Application; Technical Characteristics; Input; Analogue Output - PR electronics 2271 Bedienungsanleitung

R/I TRANSMITTER / TRIP AMPLIFIER
• Input for Pt100, Ni100, or Ohm
• Sensor cable compensation
• Linearised analogue output
• 24 VDC supply
• Adjustable alarm limit
• For mounting in 11-pole relay socket

APPLICATION:

Linearised temperature measurement with Pt100 or Ni100 sensor. • Conversion
of linear resistance change to standard analogue current / voltage signal from
e.g. valves or linear movements with attached potentiometer. • As trip amplifier
with adjustable alarm limit which may be used as an alarm detector or a simple
controller.

TECHNICAL CHARACTERISTICS:

GENERAL:
The unit is built up around a microprocessor core with an efficient program flow.
The supply voltage is 24 VDC with the same reference point for supply and
output ground. The adjust ment range for 0% (P4) and 100% (P6) trimmers is as
standard set to 5% of span, but can be ordered with an adjustment range up to
50% of span. The sensor connection is always a 3-wire connection with cable
compensation for up to 10 Ω in each wire. If a 2-wire connection is requested,
pins 7 and 6 must be short-circuited in the socket (no cable compensation).
Sensor error detection is standard set to Upscale, but may be ordered to
Downscale.

INPUT:

Linearised Pt100 temperature input according to the norm IEC 751 within the
range -200...+850°C. Linearised Ni100 temperature input according to the norm
DIN 43760 within the range -50...+250°C. Linear resistance input within the range
0...10 kΩ.
Measurement range should be specified when placing the order e.g. 0...150°C.
For RTD input the min. span is 50°C, for linear resistance 30 Ω. The RTD input
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can be delivered as multiples of the main type (e.g. Pt1000). The input can be
reversed so that 0% e.g. is 150°C and 100% is 0°C.

ANALOGUE OUTPUT:

Analogue standard current output of 0/4...20 mA. The output may be ordered to
any value within the standard values with a max. offset of 50% of the max. value
and a min. span of 5 mA. The maximum load is 600 Ω / 12 VDC. By short-circuiting
of pins 3 and 2 the output current will be converted to standard voltage of 0/0.2...1
VDC (JP1 ON) or 0/2...10 VDC (JP2 ON). The voltage signal is avail able between
pins 2 and 1. The min. load resistance for voltage signals is 500 kΩ.

RELAY OUTPUT:

Potentiometer for alarm limit adjustment is front-panel-mounted and covers the
entire measure ment range (scale 0...100%). The setpoint adjustment may be
ordered with knob or notch for screw driver adjustment. The relay output is an
uncommitted change-over contact which can be programmed to activate for
increasing (inc) or decreasing (dec) input signal with JP3. The hysteresis can with
P5 be set to 1...10% of span.
By increas ing relay function the hysteresis is below the setpoint, by decreasing
above. An LED in the cassette front indicates an activated relay.

ELECTRICAL SPECIFICATIONS:

Specifications range:
-20°C to +60°C
Common specifications:
Supply voltage ........................................... 19.2...28.8 VDC
Internal consumption ................................. 1.6 W (relay active)
Warm-up time ............................................. < 5 min.
Signal / noise ratio ..................................... Min. 60 dB
Signal dynamics, input ............................... 17 bit
Signal dynamics, output ............................ 16 bit
Response time (0...90%, 100...10%) ......... < 165 ms
Calibration temperature ............................. 20...28°C
Temperature coefficient:
Span < 100°C ........................................ ±0.01°C / °Camb.
Span > 100°C ........................................ ±0.01% of span / °Camb.
Linearity error ............................................. < 0.1% of span
EMC immunity influence ............................ < ±0.5%
Relative air humidity ................................... < 95% RH (non-cond.)
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