Gefran 40T 48 Data Sheet

40T 48

CONFIGURABLE INDICATORS - ALARM UNITS

Main applications

• Thermostats

• Humidity switches

• Mould cooling units

• Industrial refrigerators

• Air conditioning

• Food processing equipment

Main features

• Faceplate configurable input

• Protected by a personal code

• Configurable by a serial link

• Transmitter power supply incorporated

• Custom thermocouple linearisation

available

• Internal linearisation for engineering

units

• Labels provided for the more common

physical units

• Sampling time and trip intervention

programmable between 15 and
120msec with resolution between
4000 and 16000 steps

• Retransmission of the measured

variable signal

• 3 trip points, completely configurable

from the faceplate

• 4 trip points completely configurable

from keyboard

• RS485 optically isolated serial line

Protocol : GEFRAN CENCAL or
MODBUS RTU

• Rapid configuration from PC with

Winstrum package

GENERAL

Microprocessor based indicator in both
48x48 (1/16 DIN) formats
manufactured with SMT.
The instruments have a lexan
membrane faceplate (guaranteed to
IP65) which has 3 keys, a 4 digit
display and 3 indicating LED’s for the
output statuses.
The input signal can be selected from a
wide range of sensors:

• Thermocouples of type: J,K,R,S,T, B,
E, N, L GOST, U, G, D, C

• Resistance thermometers Pt100,
Pt100J 2 / 3 wire

• PTC and NTC themistors

• Linear inputs 0 to 60/12 to 60mV ,
0 to 20/4 to 20mA,
0 to 10/2 to 10/0 to 5/1 to 5/0 to 1/0,
2 to1V

The selection is made using the
faceplate keys and correct input
terminals.
No external shunt or adapter is
required.
A digital input (24Vdc/5mA) is available for
resetting, hold, flash, peak handling or
releasing latch. The instruments have a
maximum of 4 outputs that can be
mechanical relays (5A/250V) or logic

outputs 24V±10% (10Vmin / 20mA).
One output of 4 to 20mA (max. 500Ω)
is available for retranmitting the
measured input signal.
The retransmission output, the digital
input and the third output are
alternatives.
The options include a triac output that
can directly drive resistive loads up to a
maximum of 1A at 240V.
The programming of the instrument is
made easy by grouping the parameters
in function blocks (CFG for the alarm
hysteresis, Inp for the inputs, Out for
the outputs...) and by a simplified data
entry menu.
The configuration can be simplified
even further using the PC programming
kit made up of a connection cable and
a menu guide program that runs under
Windows (technical data GF_eXpress).
A configurable personal software
protection code (password protection)
can be used to restrict the levels of
editing and displaying the configuration
parameters.

TECHNICAL DATA
I

NPUTS

Accuracy 0,2% f.s. ±1digit.
Sampling time 120msec for
temperature sensors, configurable for
linear inputs down to a minimum of
15msec with reduction of the resolution
to 4000 steps.
Configurable decimal point position for
linear inputs, for TC, RTD, PTC and
NTC inputs, only one decimal digit is
allowed in the maximum display range
of -199.9 to 999.9, with indication of
open circuit thermocouple or RTD, PTC
or NTC in open or short circuit,
indication of over- and under-range for
linear inputs.

TC - Thermocouple

J 0 to 1000°C / 32 to 1832°F
K 0 to 1300°C / 32 to 2372°F
R 0 to 1750°C / 32 to 3182°F
S 0 to 1750°C / 32 to 3182°F
T -200 to 400°C / -328 to 752°F
B 44 to 1800°C / 111 to 3272°F
E -100 to 750°C / -148 to 1382°F
N 0 to 1300°C / 32 to 2372°F
L-GOST 0 to 600°C / 32 to 1112°F
U -200 to 400°C / -328 to 752°F
G 0 to 2300°C / 32 to 4172°F
D 0 to 2300°C / 32 to 4172°F
C 0 to 2300°C / 32 to 4172°F
custom -1999 to 9999

A - Indication of process variable: 10mm red display
B - Label for engineering units
C - “Function” key
D - “Raise” and “Lower” keys
E - Indication of the states of the outputs: red led
F - key not used

IP65 faceplate protection

FACEPLATE DESCRIPTION

RTD (2 or 3 wire)

PT100 -200 to 600°C / -328 to 1112°F
JPT100 -200 to 600°C / -328 to 1112°F

PTC

990Ω, 25°C -55 to 120°C / -67 to
248°F

NTC

1KΩ, 25°C -10 to 70°C / 14 to 158°F

DC - Linear

With scale configurable within the
limits:

-1999 to 9999
0 to 60mV / 12 to 60mV
0 to 10V / 2 to 10V
0 to 5V / 1 to 5V
0 to 1V / 0,2 to 1V
0 to 20mA / 4 to 20mA
Input impedance
Ri ≥ 1MΩ for 60mV, 1V
Ri ≥ 10KΩ for signal 5V, 10V
Ri = 50Ω for signal 20mA.
32-segment configurable linearisation
can be used.

Potentiometer

Supply 1,2V >100Ω

Digital input

- in voltage 24V, 5mA Ri = 4,7KΩ
isolation 1500V

- contact type

Function is configurable as alarm or
memory reset, hold, flash zero, display
of the peak value (max., min. or peak
to peak).

O

UTPUTS

4 configurable outputs:
OUT1, OUT4 relay only;
OUT2 relay, logic or triac;
OUT3 relay.

A maximum of four trip points can be
set as absolute, deviation or
symmetrical deviation alarms.
The hysteresis of each alarm is
configurable individually.
Alarm masking with exclusion on power
up, with memory, delay and minimum
intervention time.
The trip point may be set at any point
on the scale.

Relay

with NO (NC) contacts rated at 5A,
250V at cosϕ = 1.

Logic .

24 Vdc (10Vmin/20mA) limitation to
30mA (indicated in order code with D).

Triac

24...240Vac ±10% 50/60Hz, 1A max
I

2

t = 128A2sec leakage current

1,5mA max at 200Vac.

Analog retransmission

Of variable 0… 10V, 0/4… 20mA at
500W max. Resolution 12 bit.

Serial Line

Isolated 2/4 wires, RS485 interface
(1200, 2400, 4800, 9600, 19200 baud)
Protocol: GEFRAN CENCAL or MOD­BUS

P

OWER SUPPLY

Standard: 100 to 240Vac ± 10%
optional: 11 to 27Vac/dc ± 10%
50/60Hz, max. 8VA
Protected by an internal fuse (not
replaceable by the operator).

P

OWER SUPPLY

TRANSMITTER

24V ±10% unstabilised, 30mA
15V for transmitter, 30mA
1,2V for potentiometer > 100Ω

E

D

C

B

A

F