Gefran 2308 Data Sheet

2308

MULTIZONE INDICATOR / ALARM UNIT

Main applications

• Chemical and pharmaceutical
industries

• Extrusion lines in the plastics
industry

• Paper industry

• Cement works

• Food industry plant

• Marble industry plant

• Industrial machinery in general

Main features

• Up to 8 displayed points with manual
or automatic scanning

• Thermocouple, resistance thermometer,
DC V/I, AC V/I, potentiometer inputs

• Heterogeneous inputs

• Up to 10 freely configurable alarm

points

• Optoisolated 4-wires digital
communication. Protocol:
GEFRAN CENCAL or MODBUS

GENERAL

The 2308 is a universal panel instrument
for displaying up to 8 different variables
with configurable alarm or switch points.
Its characteristics of configurability, as
well as speed of acquisition and respon­se, mean that it is an extremely versatile
instrument that may be used for the
display of physical phenomena with alarm
switching in a diversity of industrial appli­cations.
The instrument can accept temperature
signals from isolated thermocouples,
even of different types, and from 2 or 3­wires resistance thermometers, as well as
from linear signals in dc voltage or cur­rent (e.g. potentiometers, amplified pres­sure probes, transmitters, etc.).
The selection of the input type for each
channel is made by harware configura­tion, while the scale range (for linear
inputs) may be configured from the front
panel keys (software).
The instrument may be also be configu­red for 8 ac voltage inputs.
Shunts and dividers are available to con­dition the various ac voltage and current
signal.
Alarm output are available with a mini­mum of 2 to a maximum of 10 using the
MD81 external expansion unit.
The alarms themselves have multiple
functions and allow ample freedom of
choice.

In particular, AL1 and AL2 can be attribu­ted to one of any of the 8 channels, or to
indicate the state of the alarm condition of
the input group (selectable in the range

1...8).
The passive current loop or RS485 serial
link is convertible to RS232 using the
CLB94 adapter.

TECHNICAL DATA
I

NPUTS

Accuracy: 0,2% f.s. ±1 digit for linear
inputs; 0,5% f.s. ±1 digit for TC, RTD,
mVac inputs.
Sampling time 0,9sec.
Number of variables to display impostable

TC - Thermocouple

J (Fe-CuNi) 0...800°C / 32...1472°F
K (NiCr-Ni) 0...1300°C / 32...2372°F
S (Pt10Rh-Pt) 0...1600°C / 32...2912°F
R (Pt13Rh-Pt) 0...1600°C / 32...2912°F
T (Cu-CuNi) -100...400°C / -148...752°F

RTD 2-3-wires

Pt100 -99,9...99,9°C / -99,9...211,8°F
Pt100 -200...400°C / -328...752°F

DC - Linear

20mV, 50mV, 100mV, 10V, Ri ≥ 1MΩ

0...20mA, 4...20mA; Ri = 5Ω

100mVac
External dividers are available for signals
from 1 to 500Vac. Ri ≥ 1MΩ and external
ammeter shunts for currents from 20mA
to 5Aac Rin ≤ 5Ω
Internal jumper selection
The 2308 can be configured for different
inputs on the same instrument with the
exception of the acmV inputs which must
all be of the same kind.

FACEPLATE DESCRIPTION

OUTPUTS

Relay

With rating: 5A/250Vac at cosϕ =1
(3,5A at cos

ϕ = 0,4).

Spark suppression on the contacts.

Logic

23Vdc, Rout = 470Ω (20mA, max. 12V).

SERIAL LINE

Optoisolated 4-wires.
The instrument is available with interface
Passive current loop 1200 baud.
RS422/485 1200/2400/4800/9600 baud.
(convertible into RS232C using a CLB94
adapter).
Protocol:
GEFRAN CENCAL or MODBUS

POWER SUPPLY

100...240Vac ±10%

11...27Vac/dc ±10%

50...60Hz; 10VAmax.

SENSOR/TRANSMITTER
SUPLLY

For supplying potentiometers, amplified
probes, transmitters, signal conditioners.

10...15V 100mA max.

AMBIENT CONDITION

Working temperature range: 0...50°C
Storage temperature range: -20...70°C
Humidity: 20...85%Ur non condensing

ALARMS

Two alarm points that are configurable
using the faceplate keys as “HI” or “LO”
alarms.

- The alarm point may be set anywhere
within the selected scale range.

- The hysteresis of the trip point may be
adjusted from the faceplate keys.

- The response time is max. 1 sec.
non-repetitive

- It is possible to configure a “LO” alarm
such that it is automatically disabled
during each start up until the input has
exceeded the alarm setpoint.
The “LO” alarm will operate if the input
subsequently falls below the entered trip
point.

- 8 further absolute alarm points (one
alarm per channel) can be added connec­ting an MD81 expansion unit.
The other characteristics are identical to
the standard alarms.

WEIGHT

500g

A - Displays the variables of the 8 channels, red digits h. 14mm
B - Function key: manual scan of the channels
C - D - Raise and Lower keys
E - Automatic/Manual scan key
F - Configuration key
G - Calibration key
H - Alarm relay energised indication, red led
I - Indication of serial communication REM and EXP, red led
L - Indication of displyed channel,

red digits h. 7mm

M - Label for engineering units.

IP54 faceplate protection (IP65 available).

H

M

GFEDCB

H
A

I

L