A
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
1
4/2001
Model 4800 Load Cell Summing Transmitter
Description
The Model 4800 is an AC or DC powered Summing Transmitter
for up to four load cells with output options of 0 to 20 mA and
0 to 10 V or 4 to 20 mA and 2 to 10 V. All input/output options
are included on one board so there is no need to specify input/
output parameters with the 4800.
The 4800 has a built in excitation supply capable of delivering
up to 120 mA at 10 V, more than enough current to drive four
350 ohm load cells.
The 4800 offers three way isolation, input to output and power,
eliminating unwanted ground loop problems. Overall accuracy
over the normal room temperature range is excellent at
<0.1% of full scale. The high gain, low drift and low
temperature coefficient of the 4800 amplifier allows full scale
live load signals as low as 5 mV to be amplified to 20 mA or
10 V with an overall accuracy of 0.1%.
Designed with large and very stable tare offset requirements
in mind, the 4800 can tare off up to 80 % of the output of a 3
mV/V load cell (at 10 V excitation).
If high/low setpoint alarms/controls are desired, the 4800
board is laid out to accept Opto-22 output relays.
Potentiometers are accessible to adjust the high and low trip
points.
Features
!
Summing of up to 4 load cells
!
Complete strain gage bridge signal conditioner
!
High gain, low drift, low temperature
coefficient precision amplifiers, with
low input current (10 pA typical)
!
Wide input range from 5 mV to
50 mV full scale
!
Very stable bridge balance with 80%
tare offset capability
!
4-20 mA or 0-20 mA output
Capable of driving 1000 ohm loop
!
2 to 10 V or 0 to 10 V output
!
Excitation supply capable of driving four
load cells
Typical 0.001% temperature coefficient
Wide adjustment voltage range
Long distance remote sense capability
Very good line and load regulation
!
Both AC & DC power capability
Surge voltage suppression
!
Input, output and power three way isolation
!
NEMA 4 enclosure for use in rugged environments
Application
!
Precision weighing with load cells
!
Process control add-on loops
!
Can be used with all types of low output sensors
A
2401 Stanwell Drive Concord, California 94520 Ph: 925/687-4411 or 800/542-3355 Fax: 925/687-3333 www.calex.com Email: sales@calex.com
2
4/2001
Model 4800 Load Cell Summing Transmitter
Specifications
NOTE: Unless otherwise noted, specifications apply after half hour warm up at 23C 2C ambient.
Temperature Coefficients apply between 0C and 55C ambient.
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Complete User's Manual available upon request.
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Model 4800 Ordering Information
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