42213 Sarah Way, Temecula, CA 92590,
Tel: 800-854-8530 (USA)
Micro Series Load Cell &
Digital Panel Meters
20 mV - 500 mV full-scale ranges, 4- or 6-wire
- Available in three digit heights:
0.56" for panel mounting,
5.0" (Mighty-5) for
- 20, 50, 100, 250 & 500 mV
- 5-digit resolution with span from
0 to ± 99,999
- Zero from -99,999 to +99,999
- Selectable fixed
- Isolated 10 Vdc supply to power
up to four 350-ohm load cells in parallel.
- 4- or 6-wire hookup
to eliminate lead resistance errors.
- Ratiometric operation
variations in excitation supply.
- Up to 60 conversions per second.
- Peak and valley value display
- Auto-tare with tare value stored
- AC or DC powered.
- Green or red display.
- Choice of isolated plug-in
options for control and computer interface:
4-20 mA & 0-10
V analog output,
RS232/485 serial I/O,
low voltage AC & DC power.
case environmentally sealed to NEMA-4X from front panel.
- 1/8 DIN
version certified to UL 3101-1, CAN/CSA-C22.2,
EN 61010-1 (CE Mark).
Micro Series load cell and microvoltmeter is a high-sensitivity monitor and controller
for use with load cells, strain gauges and microvolt input signals where high accuracy and
stability are required.
Usage as a DC microvoltmeter provides
sensitivity down to 20 mV full scale with 1 µV resolution. With a digital multiplier
of five, 99,999 counts can be displayed with a sensitivity of 0.2 µV per count. A moving
average filter with a time constant of 1.2 sec or greater should then be selected.
Usage as a load cell meter allows six-wire
hookup and scaling for direct readout in engineering units, such as pounds, kilograms or
PSI. Scaling can be via front panel pushbuttons or a computer. Zero may be set from
-99,999 to +99,999. Range may be scaled from 0 to ±99,999. Digital scaling and
calibration eliminate drift caused by potentiometers in non-microcomputer based meters.
An isolated 10 Vdc
excitation supply can provide up to 120 mA of current to power up to four 350-ohm load
cells in parallel. The meter operates in a ratiometric mode to eliminate errors due to
supply variations. When excitation sense inputs are used in 6-wire connection, the meter
compensates for variation in resistance of the transducer leads, thereby allowing long
Fast Read Rate plus Peak Capture
Series meters use
Concurrent Slope (Pat 5,262,780) analog-to-digital conversion, which allows up to 60
conversions per second, while integrating the signal over a full power cycle. High read
rate is ideal for peak value capture and for real-time computer interface and control. Peak capture is standard.
Selectable Signal Filtering
The displayed readings
and the data outputs can be separately selected to be either unfiltered or filtered.
- An unfiltered
selection updates after each conversion for fastest response, up to 60/sec, while
integrating the input signal over a full power cycle. Fast read rate provides true peak
readings and aids in control applications.
- A batch average
filter selection averages each 16 conversions for an update every 1/4 sec.
- An adaptive moving
average filter selection provides a choice of 8 time constants from 80 ms to 9.6
s. When a significant change in signal level occurs, the filter adapts by briefly
switching to the shortest time to follow the change, then reverts back to its selected
time constant. Another choice is Auto, which provides an automatic time constant selection
based on the signal noise characteristics.
Series DC, process
and load cell meters allow easy setting of scale and offset by either of two methods.
- With the coordinate
reading method, the meter reads the high and low signal values, and the user
enters the desired high an low reading values. The meter then calculates the span
multiplier and offset. This method is ideal if an external calibration reference is
- With the manual
coordinate method, the user enters the high and low input values in Volts plus
the desired high and low reading values. This method is suitable if an no external
calibration reference is available.
applications, auto-tare is standard. Auto-tare can set the displayed value to zero to
subtract the weight of an empty container. Auto-tare may be controlled by an external
pushbutton contact closure or logic signal through an input on the power supply connector.
The tare value is stored in memory. Additional capabilities for weighing
applications are provided by the Micro weight / scale meter, as described in a separate
Other Features and Options
controller, and RS232/485 serial communications boards can upgrade Micro
an Mighty Series load cell meters
from stand-alone monitor to system interface and control. With the
optional analog output board, the meter can serve
as a 0-10 V or 4-20 mA transmitter.
instruments can be powered from
95-240 Vac ±10% and 95-370 Vdc, or
optionally from 12-34 Vac and 10-48 Vdc.
Any setup functions and front panel keys may be locked out for
simplified usage and security. The popular
DIN version with 0.56" high digits is environmentally sealed to
NEMA-4X (IP65) from the front when panel mounted, and is
available with red or green LEDs.
DC Microvoltmeter Inputs
Load Cell Inputs
& Load Cell
|0.0015% of reading/°C
|CMR, DC to 60 Hz
NMR at 50/60 Hz
90 dB with min filtering
|Concurrent Slope™ (Pat 5,262,780)
60/s at 60 Hz, 50/s at 50 Hz
56/s at 60 Hz, 47/s at 50 Hz
3.5/s at 60 Hz, 3/s at 50 Hz
|5 digits, 7-segment
Available with 0.56", 1.0", 4.0" or 5.0" digits.
High brightness red. Green available
with 0.56" digits.
-99999 to +99999 or -99990 to +99990
(count by 10 with rounding)
Minus sign, 2 red LED lamps
|95-240 Vac ±10% and 95-370 Vdc
12-34 Vac and 10-48 Vdc
DC or 49-440 Hz
Safety-rated to 250 Vac, meter ground to earth ground,
DC to 60 Hz, 4.2 kVp per High Voltage Test
|5 Vdc ±5%, 100 mA max
10 Vdc ±5%, 120 mA max
24 Vdc ±5%, 50 mA max
50 Vdc to meter ground
0°C to 60°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
||In 4-wire connection, the excitation and
sense lines are tied together. The meter can make ratiometric corrections for supply
voltage variations, but not compensate for variations in lead resistance. This connection
is often used with short cable runs.
||In 6-wire connection, the sense lines are
separate from the excitation lines, thereby eliminating effects due to variations in lead
resistance. This allows long cable runs in outdoor environments with temperature extremes.
||For large scales, up to four 350 ohm load
cells can be powered by a single Micro load cell meter, whose excitation output is rated 120 mA at 10
V. The excitation and sense points of the four bridges are connected in parallel through a
Load Cell Meter Applications
To read the net weight of an object, the empty container is first weighed, and an
external button is pushed to zero out the display. The meter will then read net weight
when an object is added to the empty container. The tare value is stored in memory for
||Determining Volume Using Load Cells
An easy way to determine volume of an irregularly shaped tank with
no need for linearizing is to weigh the tank using load cells. The meter will automatic-
ally tare out the weight of the empty tank and then scale the load cell signals to units
of volume, such as gallons.
||Peak Capture for Testing the Tensile Strength of
Peak readings are automatically
captured at rates up to 60 per second, while the display updates at a legible 3.5 per
second. The peak reading can be recalled at the push of a button or be always displayed.
It can also be transmitted to a computer via RS232 or RS485.
Micro & Mighty Series Downloads