Conductivity transmitter for high conductive liquids

GLMU400

Conductivity transmitter for seawater and high-range liquid measurement, with 4-pole cell for up to 500 mS/cm. Supports conductivity, resistivity, TDS and salinity with LCD and scalable analog output.
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Introduction

Higher conductivity media and contaminated liquids place greater demands on the measuring cell. GLMU 400 MP uses a 4-pole conductivity cell, making it well suited for measurements above 2000 µS/cm, seawater and contamination-prone applications.
 
The transmitter measures conductivity and calculated values including specific resistivity, TDS and salinity, with five conductivity ranges from 0.1 µS/cm to 500 mS/cm. The current value is shown on the 4-digit LCD display, while temperature can be displayed at the touch of a key.
 
Integration into monitoring or control systems is handled via a scalable standard output. The factory-defined version provides 4...20 mA or 0...10 V, and the output can be assigned to selected display values. Temperature compensation is configurable as off, nonlinear compensation for natural waters according to EN 27888, or linear compensation with an adjustable coefficient.

High range fit
High range fit
4-pole cell covers conductivity up to 500 mS/cm for demanding liquids.
Seawater capable
Seawater capable
Designed for seawater and contamination-prone applications above 2000 µS/cm.
Multiple values
Multiple values
Measures conductivity, resistivity, TDS and salinity from one transmitter.
Scalable output
Scalable output
4...20 mA or 0...10 V output can be assigned to selected display values.
Local visibility
Local visibility
4-digit LCD shows the measured value and temperature on key press.
Protected housing
Protected housing
ABS housing with ingress protection IP65 supports wall mounting.

Features

4-pole measuring cell

GLMU 400 MP uses a 4-pole measuring cell for applications above 2000 µS/cm, contamination-prone liquids and seawater.

Measurement functions

The transmitter can be configured for conductivity, specific resistivity, TDS or salinity. The selected function determines the available measuring ranges.

Configurable ranges

Conductivity (resistivity; TDS)

  • r0: 0.0...200.0µS/cm (0...0kOhm*cm; 0.0...200.0mg/l)
  • r1: 0...2000µS/cm (0.00...20.00 kOhm*cm: 0...2000mgl)
  • r2: 0.00...20.00mS/cm (1...5000Ohm*cm; 0.00...20..00g/l)
  • r3: 0.0...200.0mS/cm (1.0...500.0Ohm*cm; 0.0...200.0g/l)
  • r4: 0...500mS/cm (1.00...50.00Ohm*cm; 0...1000g/l)
  • Salinity: 0.0...70.0
Temperature compensation

Compensation can be switched off, set to nonlinear compensation for natural waters according to EN 27888, or set to linear compensation with an adjustable coefficient.

Analog output

The device is available with a 4–20 mA two-wire output or with 0–1 V and 0–10 V three-wire outputs. The output type is fixed at the factory.

Output scaling

The lower and upper output points are set by entering the display values assigned to 4 mA and 20 mA, or to the voltage output limits.

Display and memory

The 4-digit LCD displays the current measured value. Temperature, minimum values and maximum values can be called up using the device keys.

Device configuration

Parameters are set via keyboard, including cell constant, measuring function, range, temperature compensation, reference temperature and TDS factor.

Mounting and connection

The ABS wall-mount housing uses an angled plug according to DIN 43650 for the electrical connection

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