GENERAL ORDERING INFORMATION:
Specify Meter Color & Digit Size, Meter Power and a Signal Conditioner from the list below. Specify Analog Output, Setpoint Output and Digital Interface if needed. These meters are shipped with a standard configuration and range shown below for each signal conditioner and output option type. All information for making changes is covered in the supplied Owners Manual. For other scalings or configurations, add the SC (Special Configuration) option.
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The 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 ĩV resolution. With a digital multiplier of five, 99,999 counts can be displayed with a sensitivity of 0.2 ĩV 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 ą99,999. 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 cable runs.
Micro 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.
The displayed readings and the data outputs can be separately selected to be either unfiltered or filtered.
Micro Series DC, process and load cell meters allow easy setting of scale and offset by either of two methods.
For weighing 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 web page.
Plug-in isolated analog output, dual-setpoint 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.
Micro Series instruments can be powered from 95-240 Vac ą10% 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 1/8 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.
Input Range mV | Resolution | Error at 25°C |
ą20.000 | 1.0 ĩV | |
ą50.000 | 2.5 ĩV | 0.01% FS |
ą100.00 | 5.0 ĩV | ą1 count |
ą250.00 | 12.5 ĩV | |
ą500.00 | 25 ĩV |
Full-Scale Input, mV | Zero Adjust | Span Adjust | Error at 25°C |
ą20.000 | |||
ą50.000 | -99,999 | 0 to | 0.01% FS |
ą100.00 | to | ą99,999 | ą1 count |
ą250.00 | +99,999 | ||
ą500.00 |
Accuracy | |
Span Tempco | 0.0015% of reading/°C |
Zero Tempco | 0.1 ĩV/°C |
Noise Rejection | |
CMR, DC to 60 Hz | 130 dB |
NMR at 50/60 Hz | 90 dB with min filtering |
Technique | |
Technique | Concurrent Slope™ (Pat 5,262,780) |
A-to-D Rate | 60/s at 60 Hz, 50/s at 50 Hz |
Output Update | 56/s at 60 Hz, 47/s at 50 Hz |
Display Update | 3.5/s at 60 Hz, 3/s at 50 Hz |
Display | |
Readout | 5 digits, 7-segment |
Digit Height | Available with 0.56", 1.0", 4.0" or 5.0" digits. |
Color | High brightness red. Green available with 0.56" digits. |
Range | -99999 to +99999 or -99990 to +99990 |
(count by 10 with rounding) | |
Indicators | Minus sign, 2 red LED lamps |
Power | |
Voltage, std. | 95-240 Vac ą10% and 95-370 Vdc |
Voltage, opt. | 12-34 Vac and 10-48 Vdc |
Frequency | DC or 49-440 Hz |
Power isolation | Safety-rated to 250 Vac, meter ground to earth ground, |
DC to 60 Hz, 4.2 kVp per High Voltage Test |
Excitation Output | |
5 Vdc | 5 Vdc ą5%, 100 mA max |
10 Vdc | 10 Vdc ą5%, 120 mA max |
24 Vdc | 24 Vdc ą5%, 50 mA max |
Output isolation | 50 Vdc to meter ground |
Environmental | |
Operating Temperature | 0°C to 60°C |
Storage Temp. | -40°C to 85°C |
Relative Humidity | 95% at 40°C, non-condensing |
Protection | NEMA-4X (IP-65) when panel mounted |
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 Wire
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.
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