Xentaur XDT - User Manual

Questions and Answers

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Ryan WeissAug 4, 2025
What to do if Xentaur Transmitter display shows OPN?
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  williamsonjamesAug 4, 2025
  If your Xentaur Transmitter's display shows 'OPN', consider these potential causes: 1. **Instrument Failure:** Short the SIG and SHIELD contacts of the sensor input terminal. If the instrument displays 'SHR', the problem lies in the cable or sensor. Otherwise, return the instrument for service. 2. **Open Circuit on Cable:** Disconnect the cable from the sensor and short the center pin of the plug to the outer shell. If the display still shows 'OPN', repair the cable. 3. **Open Circuit on Sensor:** Check the sensor connection or replace the sensor.
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Lisa LawsonAug 8, 2025
Why is my Xentaur XDT reading wet?
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  richardmerrittAug 8, 2025
  A wet reading on your Xentaur Transmitter could be due to a leak in the system or the use of unsuitable piping. To resolve this, fix any leaks present or replace the unsuitable pipe with copper or stainless steel. For flexible connections, use PTFE pipe and avoid rubber or plastic pipe.
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suecookAug 13, 2025
Why is my Xentaur XDT response slow?
- E
  erica73Aug 13, 2025
  A slow response from your Xentaur Transmitter may be due to several factors. While section 2.3 and sample pipe material are mentioned, bleeding a sample gas at atmospheric pressure through the sensor sampling chamber using 1/8” (3mm) o.d. sample pipe is generally more effective. The causes could be: 1. Water vapor in the system. 2. Flow rate too low. 3. Sample pipe too large and/or too long. 4. Unsuitable sample pipe. 5. Leaks. 6. Hygroscopic materials in the sample system.
J
Jeremy HansenAug 19, 2025
What does SAT mean on Xentaur Transmitter display and how to fix it?
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  Stephanie SmithAug 19, 2025
  If the display on your Xentaur Transmitter shows 'SAT', it indicates prolonged exposure to wet gas. To resolve this, dry down the sensor. You can achieve this by installing the sensor in a known dry gas stream, such as instrument quality air or dry nitrogen. Alternatively, place the sensor in a dry container or bottle with desiccant and seal it from outside air. The shipping container is designed for this purpose.
C
Christine BuchananAug 23, 2025
Why is my Xentaur Transmitter reading dry?
- B
  Brandon SmithAug 25, 2025
  A dry reading on your Xentaur Transmitter could be due to a wrongly set SpanCheck™ or a faulty sensor. Verify SpanCheck™, or return the sensor for full calibration to your representative.
K
Katherine BrownOct 28, 2025
What to do if Xentaur XDT display shows SHR?
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  Dale ThomasOct 28, 2025
  If the Xentaur Transmitter displays 'SHR', there are several possible causes: 1. **Instrument Failure:** Disconnect the cable from the input terminals. If the instrument still displays 'OPN', the issue lies within the instrument itself. If it reads, proceed to check causes 2 and 3 after reconnecting the cable. 2. **Short Circuit:** Disconnect the cable from the sensor. If the meter continues to display 'SHR', resolve the short circuit in the cable or connections, or consider replacing the cable. If the meter reading changes, check the sensor. 3. **Short Circuited Sensor:** Disconnect the cable from the sensor and observe if the meter reading returns to 'OPN'. If it does, either use a new sensor, or briefly apply approximately 20V DC to the sensor while it's in a dry condition. Note: Th...

Summary

Section 1: Introduction

1.0 Overview of the XDT

Provides a comprehensive overview of the XDT's design, features, and capabilities.

Section 2: Sensor and Sampling Techniques

2.1 Precautions using the sensor

2.3 Sensor Installation & Sampling Techniques

Explains methods for installing the sensor and selecting appropriate sampling techniques.

2.5 Troubleshooting unexpected readings

Offers solutions for common issues leading to unexpected readings from the sensor.

Section 3: Instrument

3.1 Precautions using the XDT

3.3 Installation

Guides the user through the mechanical installation process for different XDT enclosure types.

3.3.2 Electrical Connections

Outlines how to make all necessary electrical connections to the XDT instrument.

3.3.2.1 Connecting Power

3.3.2.2 Sensor Connection

3.4 Operating the Instrument

Covers the fundamental procedures for operating the XDT instrument.

3.4.1 Starting up

Describes the power-up sequence and initial instrument states.

3.4.4 Operating State

Explains how to navigate and use the instrument in its primary operating state.

3.4.4.1 Viewing Dewpoint Mode

How to view the dewpoint measurement and change engineering units.

3.4.4.2 Alarms

Configuration and behavior of the HI and LO alarm relays and indicators.

3.4.4.3 Start Calibration

Procedures for initiating instrument calibration.

3.4.4.3.1 SpanCheck Mode

Details the automatic SpanCheck™ calibration procedure.

3.4.4.3.2 Single Point Self Calibration, manual or scheduled

Explains manual and scheduled single point calibration methods.

3.4.5 SetUp State

Guides through configuring various instrument settings and parameters.

3.6 Troubleshooting the Instrument

Provides a guide to diagnosing and resolving instrument error messages and issues.

Appendix F: Sensor;SpanCheck Theory of Operation

Sensor;SpanCheck Theory of Operation

Explains the operational principles behind the Xentaur HTFTM sensor and SpanCheck™.

Appendix G: Dewpoint Response time Analysis

Appendix I: XDT Grounding Considerations

Appendix J: Analog Output vs. Dewpoint

Analog Output vs. Dewpoint Calculation

Appendix K: RS-232 C Interface Protocol

RS-232 C Interface Protocol

Appendix L: Procedure for Exchanging XDT Sensors

Procedure for Exchanging XDT Sensors

Xentaur XDT Specifications

General

Accuracy	±3% RH
Operating temperature	-20°C to +60°C (-4°F to +140°F)
Output signal	4-20 mA
Power supply	12-28 VDC
Measurement range	0-100% RH
Enclosure Rating	NEMA 4X