Alpha Moisture Systems dewTEC DS2000

Questions and Answers

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Kristopher EdwardsAug 4, 2025
Why is my Alpha Moisture Systems dewTEC DS2000 showing a wet reading?
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  Joshua PriceAug 4, 2025
  If your Alpha Moisture Systems Measuring Instruments shows a wet reading, it could be due to a leak in the system or the use of unsuitable piping. It may also arise from comparison with a secondary standard instrument or calibration gas. To address this, fix any leaks or replace unsuitable pipes with copper or stainless steel, using PTFE pipe for flexible connections, and avoiding rubber or plastic. Ensure samples are taken from the same point. Re-check the Autocal setting. If problems persist, recalibration of the system is recommended.
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harveytoniAug 8, 2025
What to do if Alpha Moisture Systems Measuring Instruments display reads due to wet gas?
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  Paula ChambersAug 8, 2025
  If your Alpha Moisture Systems Measuring Instruments displays a reading, it may be caused by wet gas or free water in the system, or an incorrectly set autocal. To fix this, stop the gas supply and switch off the instrument. Then, inspect the drain and inspection ports in the main system and sample system. Finally, readjust the autocal as described in the manual.
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Colleen AlvarezAug 14, 2025
Why is my Alpha Moisture Systems dewTEC DS2000 showing a dry reading?
- J
  John DelacruzAug 14, 2025
  If your Alpha Moisture Systems Measuring Instruments gives a dry reading, the autocal may be set incorrectly, or there may be an issue with comparison against a secondary instrument or calibration gas. Try readjusting the autocal as described in this manual. If the problem persists, replace the sensor and return the original for calibration. Also, readjust the autocal as described in this manual. If this does not cure the problem, recalibration of the system is recommended.
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Bruce MontoyaAug 18, 2025
Why does my Alpha Moisture Systems Measuring Instruments give a constant reading?
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  burtonsarahAug 18, 2025
  If your Alpha Moisture Systems Measuring Instruments displays a constant reading, it is likely due to condensation in the sample system. Condensation occurs if the temperature of the sample system or main pipe is colder than the dew point temperature of the sample gas. The sample reaching the sensor will then have a dew point equal to the temperature of the condensate, regardless of the dew point at the sample point.
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David GibsonAug 25, 2025
What causes Alpha Moisture Systems dewTEC DS2000 Measuring Instruments to display zero continuously?
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  Teresa ThomasAug 25, 2025
  If your Alpha Moisture Systems Measuring Instruments displays zero or a reading continuously, it could be due to an open circuit in the cable or sensor, or the instrument may be unserviceable. To troubleshoot, disconnect the sensor cable and check its continuity, repairing or replacing the cable if necessary. Check the continuity to the sensor body. Disconnect the sensor cable and short circuit the cable terminals; if the display indicates a reading, replace the sensor. If, after disconnecting the sensor and short-circuiting the cable terminals, the display does not indicate a reading, return the instrument for service.
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Diana TaylorAug 28, 2025
Why is the response of my Alpha Moisture Systems Measuring Instruments slow?
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  william30Aug 28, 2025
  If your Alpha Moisture Systems Measuring Instruments has a slow response, there might be free water in the system or wrongly sized or incorrect material in the sample lines. You should check the drain and inspection ports in the main system and sample pipe work. Refer to the installation section of this manual and ensure the sample tube material and flow rates are as recommended.

Summary

1.0 General Description & Features

1.1 Description

Detailed overview of the dewTEC DS2000 dewpoint meter and its primary sensor.

1.2 Main Features

Highlights the key functionalities and specifications of the dewpoint meter and its sensor.

2.0 Installation Instructions

2.1 Safety Information

Crucial safety precautions and warnings for qualified personnel before installing the instrument.

2.2 Unpacking your dewTEC DS2000 Dewpoint Meter and Sensor

Guidance on inspecting items for damage upon unpacking and handling the sensor carefully.

2.3 Sensor Care

Instructions for handling the moisture sensor to prevent damage and maintain its integrity.

2.4 Installing the air;gas sampling system

Details on setting up the piping and ensuring sample gas quality to prevent sensor contamination.

2.5 Installing and commissioning the sensor

Procedure for installing the sensor into the sample loop and initial commissioning steps.

2.6 Installing your dewTEC DS2000 Hygrometer

2.6.1 Panel mounting cut out

Specifications for the panel cut-out dimensions required for mounting the hygrometer.

2.6.2 Panel mounting

Steps for physically mounting the hygrometer onto a control panel using provided hardware.

2.7 Electrical interface connections

2.7.1 Mains (line) supply

Details on connecting the hygrometer to the AC mains power supply, including fuse recommendations.

2.7.2 Sensor Connection

Information on connecting the moisture sensor using a low impedance coaxial cable.

2.7.3 Alarm Relay Outputs

Description of the single pole double throw relay contacts for Alarm 1 and Alarm 2.

2.7.4 Linear (Analogue re-transmission) Output

Details on the 10-bit analogue signal output for re-transmitting dewpoint values.

2.7.5 Alarm Transistor Open Collector Outputs

Explanation of the NPN open collector outputs for Alarm 1 and Alarm 2.

2.7.6 Serial Communications Output

Instructions for connecting the RS485 serial communications port for data transfer.

2.7.7 External Autocal Control

Guide on connecting an external potentiometer for remote control of the autocalibration setting.

3.0 Operating Instructions

3.1 Start Up

Procedure for powering up the unit and understanding the initial display and warm-up time.

3.2 Front Panel Display and Keys

Description of the front panel display elements, LEDs, and function keys for operation.

3.3 Viewing Operating Mode Parameters

Flow diagram illustrating how to view various operational parameters like Dewpoint, Max/Min values, and alarm settings.

3.4 Setting the Alarms and hysterisis

3.5 Hysterisis Operation

3.6 Resetting a latched Alarm

Procedure for resetting a latched alarm condition by pressing the reset key (R).

4.0 Hygrometer Settings

4.1 Sensor Calibration (AUTOCAL)

Explanation of the Autocal feature and steps for calibrating the sensor on-site.

4.2 Programmed Settings

4.2.1 Program Mode

Details on entering and using Program Mode to adjust calibration data, scaling, and other settings.

4.2.2 Configuration Mode

Instructions for entering and using Configuration Mode to set alarm types, output directions, and enable/disable features.

5.0 Serial Communications

5.1 Data Format;Baud Rate

Specifies the data format (10-bit word) and supported baud rates for RS485 communication.

5.2 Protocol

Defines the communication protocol where the hygrometer acts as a slave device.

5.3 Message Format

Describes the structure of messages exchanged, including acknowledgements and message forms.

5.3.1 Message Form 1

Format for master device messages to check instrument address and expected replies.

5.3.2 Message Form 2

Format for parameter read operations, specifying identifiers and data retrieval.

5.4 Error Conditions

Information on how the system handles syntax or parity errors and invalid parameter requests.

6.0 Maintenance and Troubleshooting

6.1 Maintenance

Guidance on cleaning the front panel and sensor, and a warning against opening the unit.

6.2 Problem Guide

A troubleshooting guide listing common problems, their causes, and recommended solutions.

Appendices A - Product Specification

Appendix B - General Arrangement