Zander ZHM-100 Pressure Dew Point Meter

Overview

The Parker Zander ZHM-100 dew point meter is used to measure the moisture content of compressed air and industrial gases. The ZHM-100/450 configuration supplied here is built around the EA2-ZHM-100 transmitter, a ceramic capacitive sensor assembly that reports the pressure dew point of the gas stream continuously. The instrument carries serial number CA51-018 and manufacturing reference EAS 0405 on its nameplate, and was originally manufactured by Zander, now part of the Parker Hannifin group.

Dew point measurement is the standard method of monitoring desiccant dryers: the pressure dew point indicates the temperature at which moisture condenses out of the compressed air at line pressure, which is the value that matters for the process. Supplying a complete, functional ZHM-100 dew point meter gives plant teams a direct way to verify dryer performance and protect downstream equipment from moisture.

Engineering & Design

The ZHM-100 dew point meter measures with a ceramic PDP (pressure dew point) sensor element, and the calibration of the sensor is traceable through a documented 13-point calibration. The sensor covers the pressure dew point range of -100 °Cdp to +20 °Cdp, which corresponds to 0 to 3000 ppmv of water vapour at line conditions, according to the official product data.

The measuring cell is designed for a sample flow of 1 to 5 Nl/min, and the ZHM-100/450 variant is rated for a maximum gas pressure of 450 barg. The EA2 transmitter provides a 4-20 mA analogue output proportional to the measured dew point, which allows direct connection to a PLC, a DCS or a panel-mounted indicator.

Key Features

• Ceramic PDP sensor with 13-point traceable calibration
• Pressure dew point range -100 °Cdp to +20 °Cdp (0-3000 ppmv)
• Sample flow 1-5 Nl/min
• ZHM-100/450 variant rated for a maximum gas pressure of 450 barg
• 4-20 mA analogue output for connection to control systems
• Serial number CA51-018, manufacturing reference EAS 0405

Applications

• Monitoring desiccant and membrane compressed air dryers
• Quality control of instrument air systems
• Dew point monitoring of industrial gases and gas distribution lines
• Verifying dryer performance against its specification

Specifications

Compatibility & Integration

The ZHM-100 dew point meter connects to the sampling point of the air or gas line and returns a 4-20 mA signal that any standard analogue input can read. The transmitter can be tied into the plant DCS or PLC for continuous monitoring and alarming, or read locally by a panel meter for routine checks.

For best results the ZHM-100 dew point meter should be installed in a representative sample point with the specified flow range and pressure rating, and the unit checked against the plant’s calibration records. Our team can confirm the mounting and connection details against your application before dispatch.

Ordering Information

To order the ZHM-100 dew point meter from Seven Star LLC, quote the model number and your application details. We confirm availability and delivery to your site in Oman or anywhere in the GCC, and we verify the unit and its serial number before dispatch.

Why Seven Star LLC

Seven Star LLC supplies instrumentation and measurement spares to industrial customers across Oman and the wider GCC region. Every ZHM-100 dew point meter we supply is checked against the model number and nameplate details before dispatch, and our team confirms the unit matches your application before you order.

FAQ

Identifying Your Unit

Before purchase, compare the nameplate of the installed or specified instrument with the details given above. The ZHM-100 exists in different pressure variants, and the /450 suffix identifies the high-pressure version rated to 450 barg. Check the transmitter reference EA2-ZHM-100 and confirm the output your system expects, so the unit can be connected without changes to the receiving instrument.

Installation and Sampling

Dew point is usually measured in a small sample flow taken from the main line, rather than in the full pipe. Take the sample from the top of the pipe, downstream of the dryer, and keep the sample line short, clean and made of stainless steel so it does not absorb or release moisture. Set the sample flow within the rated 1 to 5 Nl/min range, and allow enough time for the sensor and sample line to dry down after start-up, as a new installation can take a while to reach a stable, low reading.

• Avoid plastic tubing and unnecessary fittings in the sample line.
• Protect the sensor from liquid water and oil carryover with suitable filtration.
• Check that all fittings are rated for the line pressure at the sampling point.

Maintenance and Calibration

Capacitive dew point sensors should be verified at regular intervals, typically annually, against a reference instrument or by a calibration laboratory. A reading that rises suddenly usually indicates a real dryer problem, such as a saturated desiccant bed or a failed switching valve, whereas slow drift over a long period points toward the sensor needing recalibration.

Applications in Oman and the GCC

High ambient temperatures and humidity along the coast place heavy loads on compressed air dryers in the region. A ZHM-100 dew point meter lets plants in oil and gas, power generation, gas compression and manufacturing confirm that instrument air and process gases are dry enough. Seven Star LLC can supply this unit and help check its details against your existing installation.

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