Loop Powered Process Meter

88-PRO Loop Powered Process Meter
With 0.50" high LCD digits and detachable screw terminals.

88-PRO Loop-Powered Digital Process Meter


  • Powered by 4-20 mA, 10-50 mA or 1-5 mA loop, with no need for additional power.
  • Maximum 2.5 V voltage drop.
  • Easy zero & span adjustment from rear of meter.
  • 3 1/2 digit resolution (1999).
  • Jumper-selectable dummy right-hand zeros to extend reading to 19990 or 199900.
  • Normal or inverted scaling.
  • High-legibility 12.7 mm (0.50")digits.
  • 1/8 DIN panel cutout.
  • Only 93 mm (3.66") required behind panel.
  • Environmental protection to IP54 (NEMA-12) when panel mounted.
  • High-quality plug-in screw terminals
  • Low cost.


Loop powered. The 88-PRO Process Meter may be connected directly to a 4-20 mA, 10-50 mA or 1-5 mA  current loop, with no need for additional power to the meter. This is because the meter is powered directly by the current loop, developing a maximum voltage drop of 2.5 V.

Readout in engineering units. By accepting 4-20 mA, 10-50 mA or 1-5 mA signals, the 88-PRO is compatible with a large number of industrial transducers and transmitters to display process variables such as temperature, pressure, flow, weight, pH, humidity etc. Zero and span are adjustable for direct readout in engineering units. There is an INVERT facility, so that an increasing input signal gives a reducing display, for example, 4-20 mA = 100.0 to 0.0. The 88-PRO also provides two jumper-selectable dummy right-hand zero to extend the maximum reading from the default of 1999 to 19990 or 199900. This feature allows the display of large numbers, such as the weight of a truck in pounds. It also useful when the cost of a 4 or 5 digit meter may be too high

Easy to install and set up. The 88-PRO fits in a standard 1/8 DIN panel cutout and only requires 93 mm (3.66") behind the panel. This is less than for most process meters. There are only two signal connections: signal in and signal out. These are made via a detachable screw terminal connector. All range-selection jumpers as well as the meter's zero and span adjustments are from the rear of the meter, avoiding the need to open the case.

Attractive and easy to read. The fascia of the 88-PRO is attractively styled. The simple bezel will compliment your panel design. The lens protects all legends and markings, so repeated wipe-downs won't damage the lettering or display clarity. High contrast LCDs make these meters suitable for use in bright environments. The digits measure a full 12.7 mm (0.50").

88-PRO Loop-Powered LCD Process Meter in 4-20 mA current loop

An application example. The 88-PRO loop-powered process meter is in series with 12-30 Vdc power to a two-wire 4-20 mA pressure transmitter, which measures the pressure at the bottom of a straight-sided tank. The meter's broad scaling capabilities allow it to be adjusted to display the volume of the tank. If necessary, one or two dummy right hand zeros could be added to display values up to 199900.



Effective resistance
Maximum voltage drop

4-20 mA
125 ohms
2.5 V

10-50 mA
50 ohms
2.5 V

1-5 mA
500 ohms
2.5 V


Display range
Display height
Display type
Decimal point selection
Display update rate
Open circuit response
Decimal point selection

1999, 19990, 199900 (jumper-selectable)
12.7 mm (0.50")
High-contrast LCD
Push-on jumpers
3 / sec
Display blanks
Push-on jumpers behind front panel


Resolution, max.
Calibration method
Linear ranges
A-D conversion
Integration period

0.1% of reading 1 count
1 part in 2000
Zero & span potentiometers
65 dB, 0-450 Hz
3-21 mA, 8-52 mA, 0.8-6 mA
Dual slope integration
100 ms
Derived from current loop with 2.5 V max drop


Bezel dimensions
Panel cutout
Depth behind panel
Width behind panel
Case material
Electrical connections

48 x 96 mm (1.89" x 3.78"), H x W
45 x 92 mm (1.77" x 3.62"), H x W
93 mm (3.66") including connector
98 mm (3.86") max.
Polycarbonate, UL rating 94V-0
100 g (3.5 oz)
Detachable screw terminal connector


Operating temperature
Storage temperature

-10C to 50C (14F to 122F)
-20C to 70C (-4F to 158F)
90% RH at 50C (122F), non-condensing


Mechanical dimensions of 88-PRO Loop Powered Process Meter