Union Instruments CWD3000 EXP

Questions and Answers

F
fcarterAug 2, 2025
Why is the measured value unstable on my Union Instruments Measuring Instruments?
- G
  Gary MooreAug 2, 2025
  An unstable measured value can occur if the inlet pressure controller can't maintain a constant inlet pressure because the process pressure is too high; in this case, a pressure booster pump must be installed. Direct sunlight causing rapid temperature changes can also be a factor, so direct sunlight must be prevented. Other causes include rapid temperature changes due to environmental influences or an inexact/unmaintained inlet pressure; in this case, check whether the input pressure is too high.
R
Rebecca CannonAug 8, 2025
What to do if my Union Instruments CWD3000 EXP have a drift of measured value?
- C
  Colleen LeeAug 8, 2025
  Drift in the measured value can happen if the calibration no longer achieves the required point or if the frequency controller is at its maximum value. It can also be caused by strong compressed air supply fluctuation which can no longer be corrected. Another cause could be that the heat exchanger is contaminated with soot, in which case the heat exchanger must be cleaned with hot water and then dried with compressed air. Alternatively, the thermoelectric battery may be contaminated and must be cleaned and carefully dried.
P
Patricia StephensAug 12, 2025
What to do if my Union Instruments CWD3000 EXP have a faulty ignition?
- R
  Raymond MorganAug 13, 2025
  A faulty ignition can happen if the temperature setting is incorrect. If the temperature setting is too high, the temperature threshold must be reduced. If it's too low, the temperature threshold must be increased. Also, ignition electrodes may be corroded due to frequent ignition, in that case you should replace the ignition electrode.
W
washingtonstevenAug 17, 2025
What does 'Int. pressure' error message mean on Union Instruments CWD3000 EXP?
- D
  David WaltonAug 17, 2025
  The 'Int. pressure' error message indicates an alarm due to inadequate combustion gas or calibration gas. It can also be triggered by adjustable threshold with a default of 14 mbar.
J
John JonesAug 23, 2025
What does 'Overtemp' error message mean on Union Instruments CWD3000 EXP Measuring Instruments?
- J
  Jessica EvansAug 23, 2025
  The 'Overtemp' error message indicates that the flame is too hot (Wobbe signal > 76 mV) or that there is a temperature rise in the inner tube of the thermoelectric battery > 50°C.
J
Jamie SanchezAug 28, 2025
What does 'Fault' error message mean on Union Instruments CWD3000 EXP?
- S
  Sandra RiceAug 28, 2025
  The 'Fault' error message indicates that the gas pressure is too low, there's a fault in the thermoelectric battery, or there's a defective PT 100 temperature sensor.

Union Instruments CWD3000 EXP Specifications

General

Power supply	24 V DC
Gases	Natural gas, other non-corrosive gases
Output signal	4-20 mA, HART
Accuracy	±1%
Display	LCD
Operating Temperature	-20°C to +50°C

Summary

Technical Data

Name Plate

Details on device identification, model, serial number, and certifications.

Dimensions

Provides physical dimensions and weight of the combustion calorimeter housing.

Device Overview

Visual identification of key components and markings on the device.

EC Type Examination Explosion Marking

Specifies explosion protection marking according to EC type examination requirements.

IECEx Scheme Marking

Details explosion protection marking as per the IECEx scheme.

Voltage Supply

Information on voltage requirements and power consumption of the device.

Interfaces

Lists available communication interfaces and output types (analog, digital).

Display Times for Heating Value Measurement

Specifies the time required for heating value measurement display updates.

Gas Inputs

Details the types and number of gas inputs, including connections.

Process, Calibration, and Test Gas

Describes the properties and usage of process, calibration, and test gases.

Ignition Protection Gas

Specifies requirements and parameters for the ignition protection gas.

Combustion Gas Requirements

Details requirements for combustion gas quality and connection pressure.

Linearity and Measuring Ranges

Lists available measuring ranges and accuracy for various gas types.

Ambient Conditions for Installation

Specifies environmental conditions for installation, including temperature and humidity.

EU Declaration of Conformity

Safety Instructions

Warning Information and Symbols

Explains the meaning of danger, warning, and notice symbols used in the manual.

Principle and Intended Use

Describes the device's operating principle and its intended applications.

Other Applicable Operating Instructions

Refers to additional operating instructions for linked system components.

Additional Information for Owners

Outlines owner responsibilities for gas supply and electrical connections.

Personnel and Qualification

Specifies the required qualifications for personnel performing gas and electrical work.

General Safety Instructions

Provides general safety guidelines for operating the combustion calorimeter.

Specific Hazard Information

Highlights specific hazards related to installation, setup, and repairs.

Recurring Operator Training

Emphasizes the need for recurring operator training, especially for hazardous areas.

Explosion Protection Information

Details safety precautions when opening the device in hazardous areas.

Owner Safety Precautions

Lists safety responsibilities for the owner, including protective equipment and tripping hazards.

Workplace Risk Assessment

Advises owners to conduct risk assessments and specify safety equipment.

Protective Equipment

Pressurized Enclosure Ignition Protection

Explains the "p" type ignition protection for explosive atmospheres.

Protective Housing with Doors

Describes the pressure-tight housing and its function in separating components.

Flushing Process and Overpressure Monitoring

Details the control unit's role in monitoring flush volume and overpressure.

Cable Bushings

Explains the function of cable bushings for sealed connections in ATEX/IECEx environments.

Thermal Cutoff

Describes the thermal cutoff mechanism and its tripping temperature.

Solenoid Valve

Explains the function of solenoid valves during combustion malfunctions or low overpressure.

Pressure Switches

Details how pressure switches monitor differential pressures and de-energize the device.

Markings and Warning Information

Identifies and explains internal and external warning labels on the device.

Description and Connections

External Overview and Housing Connections

Identifies external components and connection points of the device.

Interior Connections and Components

Details internal components and their connections within the device housing.

Accessories

Warns about risks associated with non-approved accessories and emphasizes using genuine parts.

Transport, Installation and Acceptance

Transport Procedures

Provides safety guidelines and notes for handling and transporting the combustion calorimeter.

Environmental Conditions

Outlines environmental requirements for storage and operation of the device.

Storage Conditions

Specifies the ambient temperature, humidity, and pressure for storing the device.

Installing and Connecting

Provides critical safety information and requirements for installation and connection.

Installation Location Requirements

Details conditions for selecting a suitable installation location, including safety and environmental factors.

Wall Mounting Instructions

Guides on how to securely mount the device to a wall, considering its weight.

Gas Connections

Covers safety and procedural aspects of connecting gas lines to the device.

Ignition Protection Gas Supply: Compressed Air

Specifies requirements for compressed air as ignition protection gas, including pressure and flow.

Combustion Gas Connection

Details requirements and safety notes for connecting combustion gas.

Carrier Gas Supply

Explains the use of carrier gas and its subsequent conversion.

Calibration Gas

Outlines requirements and safety for calibration gas usage.

Flue Gas;Exhaust Air Management

Covers safe discharge of flue gases and residual heat.

Opening and Closing Housing Doors

Details safety procedures for opening and closing device doors, emphasizing explosion protection.

Electrical Connection Safety

Highlights dangers of electric shock and explosion risks related to electrical connections.

Voltage Supply Connection

Provides instructions for connecting the device to the voltage supply, including torque and wire cross-section.

Electrical Interfaces Safety

Warns about commissioning by untrained personnel and explosion risks with electrical interfaces.

Input;Output Signal Connector Assignment

Details the pin assignments for input/output signals and warns against connecting line voltage.

Transport Securing Devices

Instructs on removing and attaching transport securing devices before commissioning or transport.

Owner Safety Precautions

Lists owner responsibilities regarding hazardous areas, flue gas discharge, and tripping hazards.

Documentation Recommendations

Recommends keeping a maintenance log and documenting all work and tests.

Commissioning and Switching On

Operator Control Elements

Work Stations

Identifies the display and control unit as the primary operator interface.

Operation

Membrane Keyboard and Display Operation

Explains how to operate the device using the membrane keyboard and display.

Basic Operation Controls

Describes the function of basic keys used for software operation.

Available Displays

Explains the various displays and how they are accessed via menu.

General Information Display

Shows example displays and provides information on software version and device status.

Menu Structure Overview

Provides a hierarchical overview of the device's menu system.

Main Menu Navigation

Describes the main menu as the standard display and its accessible submenus.

Main Menu - Options Configuration

Details configuration options for I/O, Calibration, System, and Service.

Main Menu - Options - I;O - Analog Outputs

Explains configuration of mA signals and units used for gas measurements.

Main Menu - Options - I;O - Digital Outputs

Describes configuration of digital signals, relay outputs, and their zero positions.

Main Menu - Options - I;O - mA Display

Shows mA values for active outputs and how to view them sequentially.

Main Menu - Options - I;O - Digital Inputs

Details configuration of digital input signals and their behavior for various functions.

Main Menu - Options - I;O - Display Configuration

Explains how to configure the display of measured values in four windows.

Main Menu - Options - Calibration Settings

Allows configuration of calibration values and manual start of calibration.

Main Menu - Options - Calibration - Calibration Gas Configuration

Details configuration of calibration gas properties like Wobbe index and density.

Main Menu - Options - Calibration - Automatic Calibration

Explains configuration of automatic calibration schedules and duration.

Main Menu - Options - Calibration - Automatic Calibration 2

Configures automatic calibration based on specific situations or ambient temperature changes.

Main Menu - Options - Calibration - Manual Calibration

Starts manual calibration or stops automatic calibrations.

Main Menu - Options - Calibration - Calibration Limits

Sets calibration tolerances and displays deviations from base calibration.

Main Menu - Options - System Settings

Configures basic device settings like ignition, date/time, and language.

Main Menu - Options - System - General Settings

Configures general system values like hold signals, flushing time, and display rate.

Main Menu - Options - System - Ignition Configuration

Configures ignition monitoring, including single or interval ignition.

Main Menu - Options - System - Load Factory Settings

Restores the device to its factory default configuration.

Main Menu - Options - System - CSV Export

Exports data into CSV files for analysis with spreadsheets.

Main Menu - Options - System - Hold Signal On;Off

Controls the "Hold signal" function for mA output storage.

Main Menu - Options - System - Settings - Date;Time

Allows setting the device's date and time.

Main Menu - Options - System - Settings - Language

Manages device language settings and custom bitmaps.

Main Menu - Options - System - Settings - Password

Enables changing the device password and setting unlock times.

Main Menu - Options - System - Settings - Change Color

Allows customization of display colors for different elements.

Main Menu - Options - System - Settings - Hardware 1

Configures parameters for multi-range measuring devices.

Main Menu - Options - Service Mode

Accesses service mode, requiring a password, for advanced diagnostics and settings.

Main Menu - Trend Analysis

Configures and displays graphical trend data of measured values.

Main Menu - Graphic - Select Time

Allows optimal design of diagrams by setting time increments and segments.

Main Menu - Graphic - Select Value

Configures values for curves and specifies how curves are viewed.

Main Menu - Graphic - Select Signal

Selects signals to be displayed in the curves.

Main Menu - Graphic - Select Unit

Selects units for the displayed signals.

Main Menu - Graphic - Select Curve

Allows selection of individual curves to change their parameters.

Main Menu - Event List

Stores and displays events of interest for operation and service.

Main Menu - Device Information

Displays important device data for diagnostics, including configuration and analog outputs.

Decommissioning and Switching Off

Maintenance

Preparations for Maintenance

Outlines safety precautions and preparations before starting maintenance work.

Maintenance and Inspection Schedule

Details the inspection and maintenance schedule, including steps and safety warnings.

Cleaning Surface and Display

Provides instructions for cleaning the device surface and display safely.

Troubleshooting

Preparations for Troubleshooting

Covers preparations for troubleshooting, including using the event list and exporting data.

Fuse Replacement

Specifies authorized personnel and fuse types for replacement.

Battery Replacement

Details procedures and authorized personnel for replacing the backup battery.

Unstable Measured Value Causes

Lists potential causes for unstable measured values, like pressure issues or environmental influences.

Measured Value Drift Causes

Explains causes for measured value drift, both upward and downward.

Faulty Ignition Behavior

Describes issues with faulty ignition and potential solutions like electrode replacement.

Error and Status Messages

Lists and explains various error and status messages related to Int. pressure, Overtemp, Fault, Service, Operation, Process.

Service and Support

Disposal Procedures

Spare Parts

Appendix

Profibus Data Structure

Details the structure of data transmitted via Profibus.

Serial RS232 Data Structure

Describes the data structure and format for the optional RS232 serial interface.

Related product manuals

Union Instruments CWD 2005

121 pages

Union Instruments CWD3000 EXP - User Manual

Table of Contents

Questions and Answers

Union Instruments CWD3000 EXP Specifications

Summary

Technical Data

Name Plate

Dimensions

Device Overview

EC Type Examination Explosion Marking

IECEx Scheme Marking

Voltage Supply

Interfaces

Display Times for Heating Value Measurement

Gas Inputs

Process, Calibration, and Test Gas

Ignition Protection Gas

Combustion Gas Requirements

Linearity and Measuring Ranges

Ambient Conditions for Installation

EU Declaration of Conformity

Safety Instructions

Warning Information and Symbols

Principle and Intended Use

Other Applicable Operating Instructions

Additional Information for Owners

Personnel and Qualification

General Safety Instructions

Specific Hazard Information

Recurring Operator Training

Explosion Protection Information

Owner Safety Precautions

Workplace Risk Assessment

Protective Equipment

Pressurized Enclosure Ignition Protection

Protective Housing with Doors

Flushing Process and Overpressure Monitoring

Cable Bushings

Thermal Cutoff

Solenoid Valve

Pressure Switches

Markings and Warning Information

Description and Connections

External Overview and Housing Connections

Interior Connections and Components

Accessories

Transport, Installation and Acceptance

Transport Procedures

Environmental Conditions

Storage Conditions

Installing and Connecting

Installation Location Requirements

Wall Mounting Instructions

Gas Connections

Ignition Protection Gas Supply: Compressed Air

Combustion Gas Connection

Carrier Gas Supply

Calibration Gas

Flue Gas;Exhaust Air Management

Opening and Closing Housing Doors

Electrical Connection Safety

Voltage Supply Connection

Electrical Interfaces Safety

Input;Output Signal Connector Assignment

Transport Securing Devices

Owner Safety Precautions

Documentation Recommendations

Commissioning and Switching On

Operator Control Elements

Work Stations

Operation

Membrane Keyboard and Display Operation

Basic Operation Controls

Available Displays

General Information Display

Menu Structure Overview

Main Menu Navigation

Main Menu - Options Configuration

Main Menu - Options - I;O - Analog Outputs

Main Menu - Options - I;O - Digital Outputs