The intelligent Strain Gauge amplifier offers both 4 to
20mA and 0 to 10 volt analogue outputs, from any standard
Strain Gauge input. 1 pass calibration and setting of the
analogue output range, make the unit extremely user
friendly; being set up by a simple hand held or on board
programmer/display.
Auto Tare and Peak Hold (if set) on the analogue output are
operated via volt free contact closures.
Output Options include
􀂄 Relay Set Points (LR1)
Programmed in engineering units, with In Flight
compensation and Hysterisis Settings available for control or
alarm purposes.
􀂄 Communications
To read any value, change set points or any other parameter
via:
20mA Current loop (LC1)
RS232/RS485 (LC3)
Format MANTRABUS, ASCII, MODBUS
RTU
􀂄 Printers
Activated by a function key or contact will allow print, the current
live value, with header message, engineering units, auto
incrementing batch number and real time if required.
􀂄 Options
9-32V DC power supply (LS3)
Stainless Steel case sealed to IP65 (LSS)
Available without its case as a separate
Eurocard PCB assembly (LCB)
Intelligent Strain Gauge Amplifier
The Strain Gauge amplifier is housed in a light grey ABS case, sealed to IP65
with external dimensions of 200 x 120 x 75mm
The unit comprises an intelligent base unit with 4-20mA and 0-10V analogue
outputs, and plug in module positions for the power supply, relay and
communications options.
The AC power supply is a selectable 115 or 230V AC.
Connections for input, output and power supply are through cable glands sealed to
IP65. Internal 2.5mm screw field terminals are provided.
The Units offer: Calibration
A simple 1 Pass Auto Calibration is achieved by entering the values of the
lowest and highest weights used. Analogue output is pre calibrated and can
be set over any part of the displayed range.
Both input and output are calibrated by use of the programmer module. The
programmer defaults to weight display to ease calibration checks. Auto Tare (zero)
and Peak Hold are actioned by volt free contacts.
Specifications
Inputs
The input is of the Load Cell/Strain Gauge type. With transducer excitation voltage of 9.6 volts @ 160mA to drive 6 x 350R bridges
Compensation by ± sense wires for cable and safety barrier losses down to 3V excitation
Load cell sensitivity is preset via DIL switches to 0.5, 0.8, 1.0 1.25, 1.5, 2.0, 2.5, 3.5, 5, 10, 20, 50, 100 or 200mV/V
Initial offset is no greater than ± 0.15mV (15uV/V) which is cancelled during auto calibration
Speed
Accuracy
Drift
Resolution
Contact inputs
is 100 readings per second with a digital filter to reduce speed
is 90 days ± 0.08% of reading, +/- 0.05% FSD being typical
is 0.002% per degree C @ 2.5mV/V typical
15 bit/ 4.5 digits
are available for auto tare, print and peak hold reset and are volt free

Drive
Accuracy
Resolution
Isolation
4-20mA up to 1Kohm and 0-10 volts up to 2mA
4-20mA + 0.15% of range, typical. 0-10V ±2% before calibration
as for display up to 13 bits/4.5 digits. Settling time 350mS to within 1% of step change
±130V RMS or DC max to analogue input or any other port
Power Supplies
LS1
LS3
110V-120V AC or 220/230V AC 50-60Hz 10W
9-32V DC 10W isolated
Data Retention/Protection
Retention:
Protection of data and function(s):
10 years for set up values, minimum of 100,000 write cycles.
Watchdog timer giving repeat auto resets. Impending power detection and hold off. Keypad security and time out.
CE & Environmental
Storage temperature
Operating temperature
Relative humidity
Safety/Low Voltage Directive
EMC Directive
-20 to +70ºC
-10 to 50ºC
95% maximum non condensing
73/23/EEC amended by 93/68/EEC
BS EN 61010-1:2001, IEC 1010-1-1990
89/336/EEC
Basic Standard BS EN 61326:1998
EMC Emissions
EMC Immunity
BS EN 55011:1998
BS EN 61000-42:1995
BS EN 61000-4-3:2002
BS EN 61000-4-4:2004
BS EN 61000-4-11:2004
Other Options & Accessories
2 Set Points
Communications Port
20mA loop
RS485
RS232
Printer Operation
Baud Rates
Die Cast Case
Stainless Steel Case
DC Powering
PCB Only (Eurocard) (LCB)
Output through 5A 240V AC SPCO Relays, with a latching option
For data transfer or print via :-
Enabling up to 254 units to be multi dropped to 1 x RS232 via IF25 interface(s)
Enabling up to 25 units to be multi dropped
For 1 to 1 connection and standard printer drive
By closure of volt free contact
300, 600, 1200, 2400, 4800, 9600 (19200 MANTRABUS only)
Sealed to IP65 with external dimensions of 220 x 120 x 80mm max
Sealed to IP65, with external dimensions of 224 x 160 x 90mm
9-32V dc
100 x 160 X 57mm for rack or customers enclosure