88-PRO Loop Powered Process Meter

With 0.50" high LCD digits and detachable screw terminals.

88 PRO loop powered process meter

Features

  • Powered by 4-20 mA, 10-50 mA or 1-5 mA current loop
  • Maximum 2.5 V voltage drop
  • Easy zero & span adjustment from rear of meter
  • 3½ digit resolution (±1999)
  • High-contrast 12.7 mm (0.50") LCD display
  • Selectable dummy right-hand zeros for display to ±19990 or ±199900
  • 1/8 DIN case with plug-in screw terminals
Description
88-PRO Loop-Powered Digital Process Meter

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 4½ or 5½ 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.

dc-panel-meterAttractive and easy to read. The facia 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 12.7mm(0.50").

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.

Specifications
Signal
Range 4-20 mA 10-50 mA 1-5 mA
Effective resistance 125 Ω 50 Ω 500 Ω
Maximum voltage drop 2.5 V 2.5 V 2.5 V
Display
Display range ±1999, ±19990, ±199900 (jumper-selectable)
Display height 12.7 mm (0.50")
Display type High-contrast LCD
Decimal point selection Push-on jumpers
Display update rate 3 / sec
Open circuit response Display blanks
Decimal point selection Push-on jumpers behind front panel
Electrical
Accuracy ±0.1% of reading ±1 count
Resolution, max. 1 part in 2000
Calibration method Zero & span potentiometers
CMRR 65 dB, 0-450 Hz
Linear ranges 3-21 mA, 8-52 mA, 0.8-6 mA
A-D conversion Dual slope integration
Integration period 100 ms
Power Derived from current loop with 2.5 V max drop
Mechanical
Bezel dimensions 48 x 96 mm (1.89" x 3.78"), H x W
Panel cutout 45 x 92 mm (1.77" x 3.62"), H x W
Depth behind panel 93 mm (3.66") including connector
Width behind panel 98 mm (3.86") max.
Case material Polycarbonate, UL rating 94V-0
Weight 100 g (3.5 oz)
Electrical connections Detachable screw terminal connector
Environmental
Operating temperature -10°C to 50°C (14°F to 122°F)
Humidity -20°RH at 50°C (122°F), non-condensing

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