Load Cell Signal Conditioner
Calex Mfg. Co., Inc. of Concord California announces the
Model 4800 load cell signal conditioner. The model 4800 is unique in that
it incorporates the load cell summing board function with an amplier, filter
and power supply for a complete turn-key conditioning system for hopper weighing,
scales, tank farms, etc. All components are housed on one compact PC board
that is available stand alone or mounted in a NEMA 4 painted or stainless
steel enclosure.
The Model 4800 can be powered by AC or DC. The user can select the appropriate
power source with a flick of a DIP switch. The AC Power source can be from
90 to 130 VAC or from 180 to 260 VAC. The 4800 can also operate on a DC voltage
between 11 and 30 VDC. The unit has a LED power on indicator.
The 4800 will operate with a variety of load cell resistances and sensitivities.
The live-load load cell output can be as low as 5mV full scale. The 4800 will
work with load cell outputs from 5mV to 50mV full scale. The 4800 is also
designed to work with large tare offsets through a built-in bridge balance
function. The unit can tare up to 80% full scale of a 3mV/V load cell using
10V excitation. The output of the 4800 can be selected as either 0-10V or
4-20mA through an on-board DIP switch. With the current output, the compliance
voltage is 20 Volts making the 4800 capable of driving a 1000 Ohm loop. The
frequency response of the 4800 is 10Hz making the unit ideal for static weighing
applications.
The built-in load cell excitation supply for the 4800 is adjustable from 5
to 10V. The excitation supply can provide up to 120mA making the unit capable
of driving four 350 Ohm load cells. The excitation source includes remote
sense leads to regulate the power supply directly at the load cell. Output
noise for the excitation supply is extremely low at 1 mV RMS.
The 4800 is backed by Calex’s five year warranty.
Complete Datasheet and Operation Manual: