Michell Instruments QMA401 Operating Manual

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QMA401

Trace Moisture Analyzer

User’s Manual

97450 Issue 2

March 2018

Please ﬁ ll out the form(s) below for each instrument that has been purchased.

Use this information when contacting Michell Instruments for service purposes.

Analyzer

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Analyzer

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

Analyzer

Code

Serial Number

Invoice Date

Location of Instrument

Tag No

QMA401

For Michell Instruments' contact information please go to

www.michell.com

This document is the property of Michell Instruments Ltd. and may not be copied or

otherwise reproduced, communicated in any way to third parties, nor stored in any Data

Processing System without the express written authorization of Michell Instruments Ltd.

QMA401 User’s Manual

Contents

Safety .............................................................................................................................. viii

Warnings ................................................................................................................... viii

Electrical Safety ......................................................................................................... viii

Pressure Safety .......................................................................................................... viii

Hazardous Materials (WEEE, RoHS2 & REACH) ............................................................. viii

Calibration (Factory Validation) ......................................................................................ix

Repair and Maintenance ...............................................................................................ix

Abbreviations ...................................................................................................................... x

1 INTRODUCTION ................................................................................................1

1.1 General .............................................................................................................. 1

1.2 Theory of Operation ........................................................................................... 2

1.3 Sample Gas Path ................................................................................................ 2

1.4 Internal Sampling Options ................................................................................... 3

2 INSTALLATION ..................................................................................................6

2.1 Analyzer Storage Instructions .............................................................................. 6

2.2 Unpacking the Instrument ................................................................................... 6

2.3 Electrical Requirements ....................................................................................... 7

2.4 Rear Panel Connections ...................................................................................... 7

2.5 Pressure Safety .................................................................................................. 9

2.6 Connection of Gas Supplies ................................................................................. 9

3 OPERATION ....................................................................................................12

3.1 General Operational Information ........................................................................ 12

3.2 First Time Operation ......................................................................................... 12

3.2.1 Regulating Sensor Pressure.......................................................................... 13

3.2.2 Analyzer Setup ............................................................................................ 14

3.3 Menu Structure ................................................................................................ 15

3.4 Description of Measured Parameters .................................................................. 16

3.5 Main Screen .................................................................................................... 16

3.5.1 Large Display Mode ..................................................................................... 18

3.5.2 Full Screen Graph ........................................................................................ 18

3.6 Main Screen Sub Menus .................................................................................... 19

3.6.1 Warning Screen .......................................................................................... 19

3.6.2 Logging Screen .......................................................................................... 20

3.6.3 Alarm Screen .............................................................................................. 21

3.6.4 Field Calibration Screen ............................................................................... 22

3.6.5 Monitor Screen ........................................................................................... 26

3.7 Settings Menu ................................................................................................. 27

3.7.1 Measurement Screen ................................................................................... 28

3.7.2 Pressure Input ............................................................................................ 31

3.7.3 Outputs Screen ........................................................................................... 34

3.7.4 HMI Screen ................................................................................................ 35

3.7.5 Real Time Clock Screen ............................................................................... 36

3.7.6 Software Communications Screen................................................................. 37

3.7.7 Ethernet Screen .......................................................................................... 37

3.7.8 Field Calibration History ............................................................................... 37

3.7.9 About Screen .............................................................................................. 38

3.8 Sampling Guidelines ......................................................................................... 39

3.9 Measurement Cycle .......................................................................................... 42

3.10 Calibration Cycle ............................................................................................... 44

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QMA401 User’s Manual

4 MAINTENANCE ................................................................................................46

4.1 Removal and Replacement of the Power Supply Fuse .......................................... 47

4.2 Removal and Replacement of the Dryer Module .................................................. 47

5 CALIBRATION ..................................................................................................49

5.1 Traceability ...................................................................................................... 49

6 APPLICATION SOFTWARE OVERVIEW ...............................................................51

6.1 System Requirements ....................................................................................... 51

6.2 System Connection ........................................................................................... 51

6.3 Getting Started ................................................................................................. 52

6.3.1 Connection Method (Serial Connection (RS485 or USB) .................................. 53

6.3.1.1 RS485 Connection ................................................................................. 53

6.3.1.2 USB Connection .................................................................................... 53

6.3.1.3 Modbus TCP Connection (Ethernet) ....................................................... 53

6.4 Main Window ................................................................................................... 54

6.5 Using the Chart ................................................................................................ 55

6.5.1 Chart Options Window ................................................................................. 56

6.6 Data Logging ................................................................................................... 57

6.6.1 Configuring Logging Start Time .................................................................... 58

6.6.2 Configuring Logging Stop Time .................................................................... 58

6.6.3 Starting the Log .......................................................................................... 58

6.6.4 Viewing a Log ............................................................................................. 58

6.7 Parameters / Field Calibration ............................................................................ 58

6.7.1 Field Calibration .......................................................................................... 59

7 SHIPPING .......................................................................................................60

7.1 Preparation for Shipping and Packing ................................................................. 60

Tables

Table 1 Main Screen Parameters .............................................................................17

Table 2 Alarm Screen Parameters ..........................................................................21

Table 3 Calibration Screen Parameters ................................................................... 22

Table 4 Monitor Screen Parameters ....................................................................... 26

Table 5 Measurement Screen Parameters ............................................................... 28

Table 6 Outputs Screen Parameters ....................................................................... 34

Table 7 HMI Setup Screen Parameters ................................................................... 35

Table 8 Real Time Clock Screen Parameters ........................................................... 36

Table 9 Software Communications Screen Parameters..............................................37

Table 10 Ethernet Screen Parameters ......................................................................37

Table 11 Modbus Register Map ................................................................................72

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QMA401 User’s Manual

Figures

Figure 1 Measurement System .................................................................................2

Figure 2 Internal Sampling Options ...........................................................................5

Figure 3 Power Connection .......................................................................................7

Figure 4 Rear Panel Connections ..............................................................................8

Figure 5 Typical Gas Connections ............................................................................10

Figure 6 Initializing Overlay ....................................................................................12

Figure 7 Display During Heating Period ...................................................................12

Figure 8 Typical Display .........................................................................................14

Figure 9 Menu Structure ........................................................................................15

Figure 10 Main Screen .............................................................................................16

Figure 11 Large Display Mode ..................................................................................18

Figure 12 Full Screen Graph .....................................................................................18

Figure 13 Status Screen ...........................................................................................19

Figure 14 Logging Screen ........................................................................................20

Figure 15 Front Panel ..............................................................................................20

Figure 16 Alarm Screen ...........................................................................................21

Figure 17 Field Calibration Screen .............................................................................22

Figure 18 Field Calibration Screen 2 ..........................................................................24

Figure 19 Field Calibration Screen 3 ..........................................................................24

Figure 20 Field Calibration Screen 4 ..........................................................................25

Figure 21 Field Calibration Screen 5 ..........................................................................25

Figure 22 Monitor Screen .........................................................................................26

Figure 23 Settings Menu Screen ...............................................................................27

Figure 24 Measurement Screen ................................................................................28

Figure 25 Carrier Gas Screen ....................................................................................29

Figure 26 Measurement Screen ................................................................................30

Figure 27 External Options .......................................................................................31

Figure 28 Fixed Options ...........................................................................................32

Figure 29 Atmos. Option ..........................................................................................32

Figure 30 User Gas Setup Screen .............................................................................32

Figure 31 Outputs Screen ........................................................................................34

Figure 32 HMI Screen ..............................................................................................35

Figure 33 Real Time Clock Screen .............................................................................36

Figure 34 Software Communications Screen ..............................................................37

Figure 35 Ethernet Screen .......................................................................................37

Figure 36 Calibration History Screen .........................................................................38

Figure 37 About Screen ...........................................................................................38

Figure 38 Measurement Cycle (Phase 1) - Dried Sample Flow .....................................42

Figure 39 Measurement Cycle (Phase 2) Calibration Flow ...........................................43

Figure 40 Calibration Cycle (Phase 1) - Dried Sample Flow .........................................44

Figure 41 Calibration Cycle (Phase 2) - Sample Flow ..................................................45

Figure 42 Typical QMA401 Calibration Certificate .......................................................50

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Appendices

Appendix A Technical Specification ...............................................................................62

Appendix B Calculating Conversion Factors for Gas Mixes ............................................... 64

Appendix C Modbus Holding Register Map ....................................................................66

C.1 Set Points and Ranges .................................................................83

C.2 Gases for Gas Correction Values ...................................................84

Appendix D Quality, Recycling, Compliance & Warranty Information ................................ 86

Appendix E Return Document & Decontamination Declaration ........................................ 88

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QMA401 User’s Manual

DANGER

Electric

Shock Risk

Safety

The instrument is designed to be completely safe when installed and operated correctly in accordance with the information provided in this manual.

This manual contains all the required information to install, operate and maintain this product. Prior to installation and use of this product, this entire manual should be read and understood. Installation and operation of this product should be carried out by suitably competent personnel only. The installation and operation of this product must be in accordance with the instructions provided and according to the terms of any associated safety certificates. Incorrect installation and use of this product other than those described in this manual and other than its intended purpose will render all warranties void.

This product meets the essential protection requirements of the relevant EU directives. Further details of applied directives may be found in the product specification.

Electricity and pressurized gas can be dangerous. This product must be installed and operated only by suitable trained personnel.

Warnings

Where this hazard warning symbol appears in the following sections,

it is used to indicate areas where potentially hazardous operations

need to be carried out and where particular attention to personal and

personnel safety must be observed.

Where this symbol appears in the following sections it is used to

indicate areas of potential risk of electric shock.

Electrical Safety

Ensure electrical safety is complied with by following the directions provided here and observing all local operation & installation requirements at the intended location of use.

This product is completely safe when using any options and accessories supplied by the manufacturer of this product for use with it. Refer to Section 2 (Installation) of this manual for further details.

Pressure Safety

For this product to operate satisfactorily, pressurized gas must be connected to it. Observe all the information contained within this manual and all local operation & installation requirements at the intended location of use. Refer to Section 2 (Installation) of this manual for further details.

Hazardous Materials (WEEE, RoHS2 & REACH)

This product does not contain or release any prohibited chemicals listed on the SVHC (Substances of Very High Concern) Candidate List. During the intended normal operation of this product it is not possible for the user to come into contact with any hazardous materials. This product is designed to be recyclable except where indicated, see relevant sections in this manual for further details.

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Calibration (Factory Validation)

Prior to shipment, the instrument undergoes stringent factory calibration to traceable standards. Due to the inherent stability of the instrument, regular factory calibration is not required under normal operating conditions. The instrument should perform reliably for many years with just basic maintenance, housekeeping and regular field calibrations from the internal reference (moisture generator) or a known external reference.

There are, however some consumables that will require periodic replacement.

• Moisture generator - typical lifetime of around 3 years.

• Desiccant column - typical lifetime of around 2 years, but this strongly depends on the moisture content of the sample gas. The drier the sample gas, the longer the lifetime of the desiccant.

Michell Instruments can provide a fully traceable factory calibration service for the instrument and it is recommended that this is considered at intervals of every year of the analyzer's life. Please contact your local Michell Instruments' office or representative for further details (www.michell.com).

Repair and Maintenance

Apart from user-replaceable components required for routine operational maintenance described above, the analyzer must only be maintained either by the manufacturer or an accredited service agent. Refer to www.michell.com for details of Michell Instruments’ worldwide offices contact information.

Michell Instruments ix

Abbreviations

The following abbreviations are used in this manual:

A ampere AC alternating current atm pressure unit (atmosphere) bara pressure unit (=100 kP or 0.987 atm) (absolute) barg pressure unit (=100 kP or 0.987 atm) gauge °C degrees Celsius °F degrees Fahrenheit EU European Union hr hour Hz Hertz IEC International Electrotechnical Commission IP Internet protocol ml/min milliliters per minute

mg/m lbs/MMscf pounds per million standard cubic feet mA milliampere mins minutes mmHg millimeter of mercury Pa pascal ppm ppm psia pound(s) per square inch (absolute) psig pound(s) per square inch (gauge) RH relative humidity RS485/232 standards defining the electrical characteristics of drivers & receivers RTC real time clock RTU Remote Terminal Unit SD storage device card UART universal asynchronous receiver/transmitter USB Universal Serial Bus V Volts " Inch Δ delta % percentage Ω ohms

milligrams per cubic meter

parts per million (by volume)

parts per million (by weight)

QMA401 User’s Manual

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1 INTRODUCTION

1.1 General

The QMA401 Moisture Analyzer is designed to provide reliable, fast and accurate measurement of trace moisture content in a wide variety of applications where keeping moisture levels as low as possible is of critical importance.

The high-contrast LCD touchscreen display presents all measured data to the user in a clear and understandable format. The main display incorporates a real-time trend graph and alarm indicators based on the NAMUR 102 standard. A powerful and intuitive HMI makes control, logging and configuration of analyzer parameters straightforward.

The instrument provides two user-configurable analog outputs, and ModBus RTU/TCP communications, allowing it to interface with a SCADA DCS, or by a computer using the dedicated application software. A pair of adjustable isolated alarm contacts allow the QMA401 to be used for direct process control.

The QMA401 offers:

INTRODUCTION

• ModBus RTU/TCP

• Datalogging to SD Card

• 2 user-configurable analog outputs

• Status and Process Alarms

Minimal & Straightforward Maintenance

Sophisticated instruments are often complicated and require experience and special care in use, increasing cost of ownership. The QMA401 differs through its very uncomplicated approach to field service; the desiccant column is easy to replace via the dryer service panel on the rear of the instrument. The moisture generator has an average life span of 3 years before maintenance is required.

Automated Calibration for Continued Reliability

The QMA401 incorporates an integrated automatic calibration system for complete user confidence. Periodic calibration checks of sensor performance can be initiated on demand, or automatically (at user defined intervals and time of day), providing a verification against the calibrated moisture generator or an external reference. The moisture generator at the core of this system is supplied with a calibration traceable to NPL and NIST.

During an internal calibration cycle, the Data Hold function will prevent any interruption of dependant processes by holding the analog outputs at the same level for the duration of the calibration.

Integrated Sample Handling Components

The QMA401 features an optional bypass arrangement to increase transport speed of the sample.

A pressure regulator can also be specified to increase the range of acceptable input pressure (rated to 300barg input pressure), and to protect the instrument against pressure shocks.

Michell Instruments 1

INTRODUCTION

1.2 Theory of Operation

The Quartz Crystal Microbalance (QCM) technology for moisture measurement is based on monitoring the frequency of a hygroscopic-coated quartz crystal with specific sensitivity to water vapor.

Bulk adsorption of water vapor onto the coated crystal causes an increase in the crystals effective mass, modifying its oscillation frequency in a very precise and repeatable manner. The frequency change is in proportion to the water vapor pressure in the sample gas, providing a direct measurement of moisture content.

The sorption process is fully reversible with no long-term drift effect, giving a highly reliable and repeatable measurement.

1.3 Sample Gas Path

The QMA401 measurement system must be supplied with gas at the required pressure (to match that of its calibration) via the VCR connection on the rear of the instrument. The flow is controlled automatically.

QMA401 User’s Manual

The sensor cell is located at the end of the sensor block and contains the sensor and reference oscillators.

Figure 1

HE1 HE2

V1 V2 V3

FC1 FC2 FC3

shows a schematic diagram of this sampling system:

Sample In

QCH

MFC

Sample Out

Key

DD MFC

QCH PS

Desiccant column Mass flow controller

Sensor cell Pressure sensor

Figure 1

MG V1, V2, V3

HE1/HE2 FC1

Measurement System

Moisture generator Solenoid Valves

Heat exchanger Flow control

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1.4 Internal Sampling Options

The QMA401 is available with a Pressure regulator, or a fast loop bypass with flow control. Either of these options can be configured independently or together with either an internal or external particulate filter:

• Pressure regulator

• Fast-loop bypass with flow control

GAS IN GAS OUT

FILTER

INTRODUCTION

DRYER

OVEN

S0 - No sample system. With 15μm internal filtration

GAS IN GAS OUT

FILTER

DRYER

OVEN

PRESSURE

REGULATOR

S1 - Input pressure regulator. With 15μm internal filtration

GAS IN GAS OUT

FILTER

PRESSURE

REGULATOR

VALVE

METERING

DRYER

OVEN

S2 - Input pressure regulator and Fast-loop bypass with

flow control. With 15μm internal filtration

Michell Instruments 3

INTRODUCTION

S3 - Fast-loop bypass with flow control. With 15μm internal filtration.

QMA401 User’s Manual

GAS IN GAS OUT

FILTER

DRYER

OVEN

GAS IN GAS OUT

VALVE

METERING

PRESSURE

REGULATOR

DRYER

OVEN

S4 - Input pressure regulator. External 15μm filter supplied

GAS IN GAS OUT

VALVE

METERING

DRYER

OVEN

PRESSURE

REGULATOR

S5 - Input pressure regulator and fast-loop bypass with

flow control. External 15μm filter supplied

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QMA401 User’s Manual

S6 - Fast-loop bypass with flow control. External 15μm filter supplied

GAS IN GAS OUT

DRYER

OVEN

INTRODUCTION

VALVE

METERING

Figure 2

Internal Sampling Options

Michell Instruments 5

INSTALLATION

2 INSTALLATION

2.1 Analyzer Storage Instructions

In order for this product to be functional upon installation it should be stored in accordance with the guidelines below:

• The product must be housed in a sheltered area, out of direct sunlight and rain.

• The product should be stored to minimize the possibility of sitting in ground water.

• The temperature within the storage environment should be maintained between -20 to +60°C (-4 to +140°F).

• The humidity within the storage environment must be non-condensing.

• The storage environment must not expose the analyzer to any corrosive elements.

QMA401 User’s Manual

• The product may stay assembled with its sample conditioning system (if supplied).

• All electrical and process connections should remain disconnected and capped.

• All protective coatings should remain in place until installation.

• For prolonged periods of storage, the lid of the packaging crate should be removed to allow air to circulate.

• Any documentation supplied with the product should be removed from the packaging crate and stored elsewhere to protect its integrity.

For the period from installation of the product to commissioning start-up, the following precautions should be followed:

• The product and associated sampling system (if supplied) must remain isolated from the process gas, and the enclosure should remain closed to ensure ingress protection is maintained.

• If supplied, the sampling system enclosure heating/thermostat circuit should be operated if the climatic temperature might fall below +5°C (+41°F).

• At time of start-up the procedures contained in the user manuals for both analyzer and sampling system must be followed.

If the product was previously in service/operation then the following precautions should be followed before storage:

• Upon isolation from the gas sample the entire system should be purged with a dry nitrogen gas before powering down of the analyzer.

• All connections and ports (gas and electrical) to the analyzer or sample system (if provided) should be capped.

• If the product is not removed from its location, the electrical grounding of the analyzer should remain in place.

•

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DANGER

Electric

Shock Risk

2.2 Unpacking the Instrument

Open the crate and carefully unpack the instrument.

NOTE: Retain the packaging in case the instrument is returned for factory calibration or service.

The accessories box should contain the following items:

• Traceable calibration certificate

• SD memory storage card

• USB communications cable

• IEC power cable

• Application software CD

• User's manual

If there are any shortages please notify the supplier immediately.

INSTALLATION

2.3 Electrical Requirements

The QMA401 requires the following electrical supply:

• 85 to 264 V AC, 47/63Hz, 250 VA max

• Alarm outputs comprise four sets of changeover relay contacts, one set for INTERNAL FAULTS, and three sets for PROCESS alarms. All contacts are rated at 24 V, 1A. NOTE: THIS RATING MUST NOT BE EXCEEDED

Fuse

This product is provided with an internally mounted fuse. A replacement fuse can be obtained by contacting Michell Instruments' technical support. Fuse rating = 5 x 20mm 3 A anti-surge to IEC 60127-2.

Power Connection

The product is provided with an IEC C13 socket on the rear panel for mains power input.

This equipment must be supplied with a voltage between the range of 85 to 264 V AC, 47/63Hz, maximum required power is 140 W.

Figure 3

Power Connection

Michell Instruments 7

INSTALLATION

2.4 Rear Panel Connections

POWER:

85-264V AC

47-63Hz 100VA

T2.5

NC1

NO1

MODBUS 485

ALARMS 1 - 2

MODBUS

USB

SERIAL NUMBER

1 Power Connection IEC Power Socket, On/Off Switch & Fuse

2 Electrical Connections #1

3 Bypass Flow Adjustment 4 Ethernet

5 Electrical Connections #2

6 Inlet Pressure Control 7 Dryer Module Access Panel 8 Gas Outlet 9 Gas Inlet

QMA401 User’s Manual

NC3

NC4

NC2

NO3

NO2

COM1

NO4

COM3

COM2

ALARMS 3 - 4

SIG

+24V

COM4

EXTERNAL PRESSURE

RS485

(Modbus)

Alarms 1 & 2

Alarms 3 & 4

External

Pressure

Analog Output

OP1-

OP1+

ANALOGUE

OUTPUT

OP2-

OP2+

USB A B G

NC1 NO1

COM1

NC2 NO2

COM2

NC3 NO3

COM3

NC4 NO4

COM4

Analyzer Status Alarm NO in warning/fault condition NC no warning / no fault

+24V

Signal

OP1+

OP1-

OP2+

OP2-

Figure 4

Rear Panel Connections

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2.5 Pressure Safety

This product is used in conjunction with pressurized gases.

Pressurized gas is dangerous and should only handled by

DO NOT permit pressures greater than the specified safe working pressure to be applied directly to the instrument.

INSTALLATION

WARNING:

Observe pressurized gas handling precautions.

WARNING:

suitably trained personnel.

For the calibration to remain valid the QMA401 must be

operated at the pressures specified on the calibration

certificate (typically a sample pressure of 1 barg (14.5

psig), with the outlet at atmospheric pressure). When using

the pressure control option, the cell pressure should never

exceed the maximum stipulated operating pressure of 1

2.6 Connection of Gas Supplies

Sample gas connections are made via the gas inlet and outlet 1/4" VCR ports located on the rear panel of the instrument as shown in with high quality stainless steel tubing.

NOTE: No external gas couplings are supplied with the analyzer but can be ordered as an accessory by contacting Michell Instruments - see www. michell.com for contact details.

barg (14.5 psig).

Figure 5

. All connections should be made

Michell Instruments 9

INSTALLATION

SAMPLE

OUTLET

QMA401 User’s Manual

NOTE: Items 1 to 6 are not

supplied with the unit, and

only illustrated to show a

typical gas coupling.

Figure 5

Typical Gas Connections

Making a connection to the 1/4" VCR fitting:

1. Clip the gasket and its retaining ring (8) over the end of the VCR adaptor (5)

2. Locate the end of the VCR adaptor (5), fitted with the gasket (8) over the VCR port (9) and screw the locking nut (7) finger tight to fix the adaptor to the port.

3. Tighten the locking nut (7) one eighth of a turn.

Connection to a VCR to 1/4" Swagelok tube adaptor: (available as an accessory)

1. Cut ¼” stainless steel tubing (1) to the correct length and, if necessary, bend to shape to suit the location of the instrument. NOTE: To facilitate

ease of connection to the adaptor (5), at least 75mm (3 in) of the tubing coming out of the adaptor must be straight.

2. Clean off any burrs or metal shavings adhering to the tubing.

3. Pass the tubing (1) through the locking nut (2), and the back ferrule (3).

4. Place the front ferrule (4) over the stainless steel tubing (1), bevelled end towards the adaptor (5).

5. Insert the stainless steel tubing (1) as far as it will go into the adaptor (5) and tighten up the locking nut (2) finger tight.

6. Hold the adaptor (5) flats with a spanner and tighten up the locking nut (2). This action compresses the front ferrule (4) and back ferrule (3) onto the tubing to form a gas tight seal. Caution: Do not overtighten as

this could cause the ferrules to crack and destroy the integrity of the seal.

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The couplings can be checked for leaks by pressurizing the system (by connecting the sample line to the process) and introducing a proprietary leak test solution into each of the test ports (6) located on the locking nut (7). If a stream of bubbles is produced then the gasket seal is leaking. If no bubbles are produced, the seal is gas tight.

If a leak is detected, tighten up the locking nut (7) a little more until the leak stops. If the leak cannot be stopped by tightening the coupling, unscrew the locking nut (7), and remove the coupling from the instrument.

Examine the ends of the coupling to check that the surfaces are not damaged and then fit a new gasket (8), re-connect and re-test.

INSTALLATION

Michell Instruments 11

OPERATION

3 OPERATION

This section describes both the general operation of the analyzer and the method of setting-up and changing the default parameters if this should become necessary.

Prior to operation, the instrument must have been connected to the correct electrical power supply and the relevant analog and alarm outputs connected to external systems as required and as described in Section 2. The instrument must also have been installed as detailed in Section 2 and connected to a sample gas supply that is representative of the monitored process.

3.1 General Operational Information

Operation of the QMA401 Trace Moisture Analyzer is completely automated and once setup requires little operator intervention besides routine maintenance.

3.2 First Time Operation

QMA401 User’s Manual

When the instrument is switched on an Initializing overlay will be shown while the menu system loads.

QMA401

Trace Moisture Analyzer

Initializing

Figure 6

After initialization is complete, the following display will appear.

Initializing Overlay

Figure 7

The heating period lasts about an hour, allowing time for the internal sampling system to purged with the sample gas.

Display During Heating Period

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QMA401 User’s Manual

3.2.1 Regulating Sensor Pressure

The sensor pressure of the QMA401 must match the pressure stated on the calibration certificate in order for the calibration to be valid.

To control the sensor pressure, a pressure regulator is required on the input of the analyzer.

An integral pressure regulator (rated to 300barg input pressure) can be supplied as an option at time of order. Otherwise, when choosing an external pressure regulator, select one designed for use in high purity gas, with a stainless steel body and diaphragm to minimize impact on sample response speed when measuring dry samples.

To set the input pressure:

1. Power the analyzer on and wait for the oven to heat up before proceeding.

OPERATION

2. Navigate to the Monitor Screen. pressure seen by the cell.

3. Use the pressure regulator to adjust the pressure shown on your calibration certificate.

NOTE: The pressure at the outlet should be atmospheric, unless otherwise stated on the calibration certificate.

4. Familiarize yourself with the menu system of the analyzer, and setup the parameters listed in the next section. Before a measurement is made, ensure the correct carrier gas has been selected in the menu system.

Sensor pressure shows the actual

Sensor pressure to match the

Michell Instruments 13

OPERATION

3.2.2 Analyzer Setup

During the period when the oven is heating to set point, all functions except for HMI adjustments are disabled until the oven has reached its operating temperature. During this time, the carrier gas setting needs to be configured correctly for the gas being measured. A number of presets are available for single gas types - if the intended sample is a mixture of gas components then the gas conversion factor needs to be calculated according to the instructions in Appendix B.

• Temperature and pressure units

• Pressure input

• Alarm configuration

• Analog output configuration

• Field calibration parameters

• Real time clock

QMA401 User’s Manual

Upon completion of oven heating the Main Screen will appear showing the default parameters and units (example shown below).

Parameter

1 & 2

Figure 8

Typical Display

Using the inlet pressure regulator adjust the sample pressure until the reading on the internal sensor pressure readout on the Monitor page matches the value on the calibration certificate. The pressure at the outlet should be atmospheric unless otherwise stated on the calibration certificate.

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QMA401 User’s Manual

3.3 Menu Structure

LARGE DISPLAY

PARAMETER 1

LARGE DISPLAY

PARAMETER 2

FULL SCREEN

GRAPH

SETTINGS

MEASUREMENT

OUTPUTS

HMI

RTC

SW COMMS

CAL HISTORY

ABOUT

FIRMWARE VER

SERIAL NUMBERS

MAIN SCREEN

WARNINGS

LOGGING

ALARMS

FIELD CAL

MONITOR

CARRIER GAS

DP CALCULATION

PURGE

PRESSURE INPUT

OUTPUT SELECT

PARAMETER

OUTPUT TYPE

LOW

HIGH

ERROR INDICATION

LANGUAGE

CHART PERIOD

BRIGHTNESS

SIGNAL SMOOTHING

DAY/MONTH/YEAR

HOUR/MINUTE

LOCK SCREEN TIME

TEMP UNIT

PRESSURE UNIT

FLOW UNIT

SAVE DATE

SAVE TIME

OPERATION

OVEN TEMP CNTL

ENCLOSURE TEMP

FLOW CONTROL

CELL PRESSURE

EXT PRESSURE

INSRUMENT DRIFT

BEAT FREQUENCY

PPMV OVER RANGE

LOG INTERVAL

INTERVAL UNITS

START/STOP

ALARM SELECTOR

CLEAR LATCH

PARAMETER

CALIBRATE

ANALOG O/P HOLD

CAL SOURCE

CAL METHOD

SETTLING CYCLES

CALIBRATION CYCLES

MOISTURE PPMV

BEAT HZ

DELTA HZ

SYS TEMP °C

FLOW RATE

SENSOR PRESSURE

EXT PRESSURE

OVEN TEMP SENS

OUTPUT 1

OUTPUT 2

OSCILLATOR COM

ETHERNET COM

DRYER SERVICE

MOIST GEN SERVICE

CAL ALARM

LATCH

LOW

HIGH

REF SOLENOID

SAMPLE SOLENOID

CAL. SOLENOID

DRYER % LEFT

MG DAYS LEFT

SCF

MGV

MODBUS ID

PROTOCOL

ADDRESS

Figure 9

Menu Structure

IP ADDRESS

SUBNET MASK

DEFAULT GW

Michell Instruments 15

OPERATION

3.4 Description of Measured Parameters

QMA401 User’s Manual

Moisture content ppm

Moisture content mg/m

Water Vapor Pressure Pa Water vapor pressure in pascals

lbs/MMscf Pounds H

Frost Point

Oven Temperature Temperature of the internal oven

Flow Gas flow rate

Cell Pressure Pressure measured by the internal pressure transducer

Ext. Pressure

3.5 Main Screen

Parts per million of H2O by volume

Parts per million of H2O by weight

Milligrams H2O per cubic meter gas

O per million standard cubic feet

Frost point temperature of either ideal or natural gas depending on options set on measurement screen

Pressure measured by an external pressure transducer (if fitted)

Figure 10

Main Screen

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Parameter Description

Parameter 1 & 2 Graph

Alarm 1, 2 & 3

Alarm 4 Internal

Live reading of the selected display parameters. Live graph reading of parameter 1. The current state of the alarms.

Possible alarm states:

Low – Alarm type is set to Low, and has been triggered because the

selected parameter is below the threshold value.

OK – Alarm has not been triggered. High – Alarm type is set to High, and has been triggered because

the selected parameter is above the threshold value.

Trip - Alarm has been triggered previously, the selected parameter

then fell back within acceptable limits. Analyzer Status Alarm Relay

Activated for warning/fault Selection set in Modbus Register 9 (see appendix D)

Internal warning alarms.

OPERATION

Warnings

Graph Delta

Instrument Mode

Oven Temperature/Next Mode

Possible alarm states:

OK, WARNING

Shown as ΔX (where X=the currently selected primary measurement parameter) – Displays the difference between the minimum and maximum graph measurements.

Displays the current instrument mode.

Possible instrument modes:

Measure – The QMA401 is performing a measurement cycle Cal Internal – The QMA401 is performing a self-calibration using

the internal reference

Cal External – The QMA401 is performing a self-calibration using an

external reference

Heating – The oven is still heating to the set-point temperature

Displays the countdown to the next mode. If the QMA401 is in warm up mode this parameter is replaced with a live oven temperature reading.

Table 1 Main Screen Parameters

Michell Instruments 17

OPERATION

3.5.1 Large Display Mode

To access large display mode, press and hold on the measurement parameter to be enlarged.

To return to the Main Screen, touch anywhere on the screen.

QMA401 User’s Manual

3.5.2 Full Screen Graph

Displays a full screen graph of Parameter 1.

To access the full screen graph, press the graph area of the Main Screen.

To return to the Main Screen, touch anywhere on the screen.

Figure 11

Large Display Mode

Figure 12

Full Screen Graph

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3.6 Main Screen Sub Menus

The following sub menus can be accessed from the Main Screen:

• Warnings

• Logging

• Alarms

• Field Cal

• Settings

• Monitor

3.6.1 Warning Screen

The buttons on this screen are used to toggle the internal alarms on/off. When an individual alarm is disabled it will not trigger the internal alarm.

OPERATION

Figure 13

Displays the state of the internal alarm associated with each of the parameters above, indicated by the following icons:

Value Description

Off

Alarm disabled

Alarm enabled. No fault

Alarm enabled. Fault condition

Status Screen

Michell Instruments 19

OPERATION

3.6.2 Logging Screen

Controls logging to the SD card.

QMA401 User’s Manual

Figure 14

Parameter Description

Log Interval Interval Units Status Filename

Frequency of recording data to the log file Available Options: Cycles, Seconds Displays status information related to logging, e.g. SD card full Automatically generated filename based on current time and date

The SD card should be formatted as FAT32.

Frost Point

-66.9

Cell Pressure

3.0

SD card

slot

1 H20 mg/m3

2 WVP Pa

Alarms

3 H20 lbs/MMscf

4 Warnings

Logging Screen

°C

barg

HIGH

LOW

TRIP

-5 -4 -3 -2 -1 0m

DP °C

Inst. Mode

Next Measurement

0.00

Calibration

WARNINGS CALIBRATE SETTINGS MONITORLOGGING ALARM

Figure 15

Front Panel

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3.6.3 Alarm Screen

OPERATION

Parameter Description

The left and right arrow keys are used to toggle through the different alarms available.

Alarm Selector

Available Options: Alarm 1, Alarm 2, Alarm 3, Alarm 4 - Analyzer Status Alarm only

Clears a latched alarm.

Clear Latch

Available Options: Yes, Cleared Selects the parameter for the corresponding alarm.

Available Options:

Moisture Content ppm Moisture Content ppm Moisture Content mg/m

Parameter

Water Vapor Pressure Pa Moisture Content lbs/MMscf Frost Point Oven Temperature Flow ml/min Cell Pressure External Pressure

Low

Selects the lower alarm limit for the corresponding alarm using the keypad which is opened.

Selects between latched and non-latched alarms.

Latch

Available Options: On, Off

High

Selects the higher alarm limit for the corresponding alarm using the keypad which is opened.

Table 2 Alarm Screen Parameters

Figure 16

Alarm Screen

Michell Instruments 21

OPERATION

3.6.4 Field Calibration Screen

QMA401 User’s Manual

Figure 17

Parameter Description

Calibrate

Starts a calibration procedure if a manual calibration has been selected. Toggles data hold mode. This determines whether the last valid

measurement is held while a calibration is carried out.

Analog O/P

Hold

Cal Source

Available Options: On, Off If data hold is selected, the user can select how many cycles, after the

calibration, the last measured value is held for. Toggles between an external calibration source or the internal

calibration source. If an external calibration source is selected the external reference moisture must be entered in the ext ref setting.

Available Options: External, Internal

External Cal Source - when this is chosen Ext Ref will need to be

entered to show the ppm

Internal Cal Source - when this is chosen then the Cal Method can be

set to Manual or Automatic.

Field Calibration Screen

value of the external moisture reference.

Table 3 Calibration Screen Parameters

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Parameter Description

Toggles between manual calibration or automatic calibration mode.

Available Options: Automatic, Manual

Manual Cal Method - if this is chosen the Start button must be

pressed in order to initiate the calibration procedure. If this method is chosen then both the Interval and Hour selection boxes are hidden and a Start button is displayed.

Automatic Cal Method - if this is chosen then the following parameters

will need to be set and will be displayed on the screen. Calibration will

Cal Method

begin on the time selected using the interval and hour settings.

Interval (Days)

Hour

Settling Cycles

Cal Cycles

OPERATION

Frequency of automatic calibrations in days. The hour in the day at which an automatic

calibration will start. Period of time for the QMA401 to stabilize to the

new moisture level (as presented by the internal moisture generator or external ppm value) before conducting the actual calibration cycles.

Sets how many calibration cycles are carried out.

Table 3 Calibration Screen Parameters

Michell Instruments 23

OPERATION

If Analog O/P Hold is turned off then the ‘Hold Cycles’ selection box is hidden, as shown below:

QMA401 User’s Manual

Figure 18

Hold Cycles – If Analog O/P Hold is selected, the user can select for how many cycles after the calibration the last measured value is held for. This is done using the onscreen keypad which is opened.

If an external calibration source is selected the user must enter the external reference moisture in the Ext Ref (ppm) setting.

If an internal calibration source is selected then the ‘Ext Ref’ selection box is hidden (as shown above). If an external calibration is selected then the calibration mode is forced to manual i.e. an automatic calibration cannot be carried out if the external calibration source is active. The ‘Cal Method’ selection box is also hidden, as shown below:

Field Calibration Screen 2

Figure 19

If an automatic calibration is selected then calibration will begin on the time selected using the interval and hour settings. This is done using the onscreen keypad which is opened.

Field Calibration Screen 3

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If a manual calibration is selected then both the ‘Interval’ and ‘Hour’ selection boxes are hidden, as shown above. If an automatic calibration is selected then the “Calibrate”, “Cal Source” and “Ext Ref” selection boxes are hidden, as shown below:

OPERATION

Figure 20

• Interval (Days) – This is where the user selects how often in days a calibration is performed.

• Hour of Day – This is where the user selects the hour within the day at which the calibration will occur.

• Cal Cycles – This is where the user selects how many calibration cycles are carried out.

• Settling Cycles – This is where the user selects how many settling cycles are added after the calibration.

NB. If a manual calibration has been started the page will hide all the parameter and instead show the calibration and settling cycle countdown. This can be seen below:

Field Calibration Screen 4

Figure 21

Field Calibration Screen 5

Michell Instruments 25

OPERATION

3.6.5 Monitor Screen

QMA401 User’s Manual

Parameter Description

Moisture Content (ppmV)

Beat Frequency

Delta Frequency

Enclosure Temperature

(0C)

Flow Rate (ml/min) Cell pressure (barg) Ext. pressure (barg)

Ref Solenoid

Sample Solenoid

Internal Cal Solenoid

Dryer vol. remaining %

MG remaining (days)

SCF

MGV

Figure 22

Live moisture reading in ppm Live beat frequency reading: the frequency difference

between the two crystals. Live delta frequency reading: the frequency difference

between the sample and reference phase.

Live system temperature.

Live flow rate reading in ml/min. Live internal pressure transducer reading. Live process pressure reading. Displays the reference solenoid state. Displays the sample solenoid state. Displays the internal calibration solenoid state. Remaining dryer life in %. Remaining MG life in days. Sensor correction factor set during the last calibration cycle. Moisture Generator value.

Monitor Screen

Table 4 Monitor Screen Parameters

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3.7 Settings Menu

Figure 23

OPERATION

Settings Menu Screen

Allows access to the following sub menus to change instrument settings.

• Measurement

• Outputs

• HMI

• RTC

• SW Comms

• Cal History

• About

Michell Instruments 27

OPERATION

3.7.1 Measurement Screen

QMA401 User’s Manual

Figure 24

Parameter Description

Toggles through the different carrier gas options.

Available Options: Air, Ar, CH

Carrier Gas

CO, CO User 3

User Gas Entry: If a User option is chosen in Carrier Gas then this

Parameter will show on the Measurement Page. See Appendix B for more information.

Sets the frost point calculation method.

DP Calculation

Available Options: ISO (ISO 18453) Ideal Gas, IGT (IGT Bulletin #8)

Selects the pressure source.

Available Options:

Atmos – Atmospheric pressure.

Pressure Input

Fixed – User-settable fixed value.

When the Fixed option is chosen it enables a fixed value to be entered.

External – An externally connected pressure transducer.

When the External option is chosen it enables the choice of the zero and span range pressure transducer values of 4 or 20mA.

Measurement Screen

, C2H2, C2H4, C2H6, C3H6, C3H8, C4H10,

, H2, He, Kr, N2, Ne, NH3, NO, N2O, O2, Xe, User 1, User 2,

Purge Feature

This enables or disables the purge function, see section 3.7.1.3 below.

Table 5 Measurement Screen Parameters

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3.7.1.1 Carrier Gas

Used to select a different carrier gas. When the user presses this box the page below is opened.

OPERATION

Figure 25

There are 20 different preset gases the user can choose from, along with 3 user definable presets;

• Air

• Argon

• Methane

• Acetylene

• Ethylene

• Ethane

• Propane

• Butane

• Propene

• Carbon Monoxide

Carrier Gas Screen

• Hydrogen

• Helium

• Neon

• Krypton

• Ammonia

• Nitric Oxide

• Nitrous Oxide

• Oxygen

• Xenon

• User 1

• Carbon Dioxide

• Nitrogen

After selecting the gas the user is taken back to the previous page.

• User 2

• User 3

Michell Instruments 29

OPERATION

NB. If User1, 2 or 3 is selected as the carrier gas then a new parameter box will appear underneath the carrier gas toggle box called ‘User Gas Entry’. This can be seen below.

QMA401 User’s Manual

When the User Gas option is selected from the carrier gas list, the user can enter the user gas settings, using the User Gas Setup page which is opened. See Appendix B for further information on calculating User Flow Correction Factors.

3.7.1.2 DP Calculation Method

Selects the calculation method used for dew point and lbs/MMscf. Options are:

• IGT - as per IGT Bulletin #8

• ISO - as per ISO18453

• Ideal Gas

3.7.1.3 Purge

The purge feature will allow the user to purge the sensor crystals with high flow dry gas quickly – this is a flush through/cleaning process for the internal gas path if switching gas or wishing to disconnect any service items to ensure they are clean. This is done by energising the reference solenoid and de-energising both the calibration and sample solenoids. The flow control through the MFC is also increased up to 400ml/min from 100ml/min. These two actions allow the dry gas to flow through the sensor block. During this time the heating control in the oven may be compromised due to the increased power consumption of the solenoid. If this happens it can take roughly 20 minutes to cool down to its set point of within 60°C ±0.05°C for a period of at least 15 minutes.

Figure 26

Measurement Screen

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3.7.2 Pressure Input

Selects the pressure source. Options are:

• Atmos.

• Fixed

• External

If the external option is selected the ‘Fixed’ selection box is hidden and replaced with the ‘Ext. 4mA’ and ‘Ext. 20mA’ selection boxes as shown below:

OPERATION

Figure 27

External Options

Michell Instruments 31

OPERATION

If the fixed option is selected the ‘Ext. 4mA’ and ‘Ext. 20mA’ selection boxes are hidden and replaced with the ‘Fixed’ selection box as shown below:

QMA401 User’s Manual

Figure 28

If the ‘Atmos.’ option is selected the ‘Fixed’, ‘Ext. 4mA’ and ‘Ext. 20mA’ selection boxes are all hidden as shown below:

Figure 29

• Fixed – Allows the user to enter the fixed pressure using the onscreen keypad.

• Ext. 4mA – Allows the user to enter the pressure at 4mA using the onscreen keypad.

• Ext. 20mA – Allows the user to enter the pressure at 20mA using the onscreen keypad.

• Pressure Unit –This displays the current Pressure unit. Please note this cannot be changed on this page.

Fixed Options

Atmos. Option

Figure 30

User Gas Setup Screen

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• Gas – Allows the user to enter a unique name for the gas using the onscreen keypad.

• Molecular Weight – Allows the user to enter the molecular weight of the gas using the onscreen keypad.

• FCF – Allows the user to enter the Flow Correction Factor using the onscreen keypad. See Appendix B for instruction on how to calculate the FCF.

OPERATION

Michell Instruments 33

OPERATION

3.7.3 Outputs Screen

QMA401 User’s Manual

Parameter Description

Output

Selector

Parameter

Selects output required.

Available Options: Output 1, Output 2 Toggles through the different output parameters.

Available Options: Oven ˚C, ml/min, Cell Pr. barg, External Pr. barg, H

O ppmV, H2O ppmW, H2O mg/m3, WVP Pa, lbs/MMscf, DP ˚C

Toggles the signal type of the output.

Output Type

Available Options: 1-5 V, 4-20 mA

Min

Max

Error

Indication

Selects the lower output limit for the corresponding output. Selects the higher output limit for the corresponding output. Selects the mA error indication level for the outputs.

Available options: 3.2mA, 21.4mA

Figure 31

Outputs Screen

Table 6 Outputs Screen Parameters

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3.7.4 HMI Screen

OPERATION

Figure 32

Parameter Description

Language

Chart Period

Toggles through the different languages available. Selects the time scale of the chart.

Available Options: 5 mins, 30 mins, 1 hr, 5 hrs, 10 hrs, 24 hrs

Sets the screen brightness level in %.

Brightness

Available Options: 5 - 100% Select the smoothing signal level.

Signal Smoothing

Available Options: Low, medium, high The user can toggle through the different lock screen

Lock Screen Time

timeout options.

Available Options: 5 mins, 15 mins, 30 mins, Off Toggles through displayed temperature units.

Temperature Unit

Available Options: °C, °F Selects the units in which the pressure measurements

Pressure Unit

are displayed.

HMI Screen

Available Options: barg, bara, psig, psia, MPa, mmHg Selects the flow units.

Flow Unit

Available Options: ml/min, sccm/min

Table 7 HMI Setup Screen Parameters

Michell Instruments 35

OPERATION

3.7.5 Real Time Clock Screen

QMA401 User’s Manual

Figure 33

Parameter Description

Day / Month / Year

Hour / Minute

Save Date Save Time

Table 8 Real Time Clock Screen Parameters

Sets the current date for the real time clock. Sets the current time for the real time clock. Saves the updated date. Saves the updated time.

Real Time Clock Screen

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3.7.6 Software Communications Screen

OPERATION

Parameter Description

Instrument ID

Protocol

Address

Table 9 Software Communications Screen Parameters

3.7.7 Ethernet Screen

Figure 34

Sets the instrument address using the keypad. Toggles different physical layer types.

Available Options: RS485 / USB / TCP/IP

This open the Ethernet page, where the user can configure the network settings.

Software Communications Screen

Figure 35

Parameter Description

IP Address Subnet mask Default gateway Apply

Instrument's static IP address on the network. Subnet mask of network that the instrument is on. The default gateway of the network that the instrument is on. Applies modified settings

Table 10 Ethernet Screen Parameters

Ethernet Screen

Michell Instruments 37

OPERATION

3.7.8 Field Calibration History

QMA401 User’s Manual

Parameter Description

Sensor Correction

Factor (SCF) Selector

Apply

3.7.9 About Screen

Figure 36

Cycles through the results of each previous calibration cycle.

Applies the SCF from the selected previous calibration cycle.

About

Control Firmware Oscillator Firmware Display Firmware Analyzer Serial Number Oven Serial Number

Calibration History Screen

V1.01 V1.00 V1.25 12345 12346

Michell Instruments QMA401 Trace Moisture Analyzer www.michell.com

Figure 37

Displays the instrument firmware versions and serial numbers.

About Screen

SERVICE

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3.8 Sampling Guidelines

The QMA401 Trace Moisture Analyzer is designed to operate in a flowing gas stream and is suitable for the measurement of the moisture content of a wide variety of gases. In general, if the gas (in conjunction with water vapor) is not corrosive to the sampling system and the sensor base metals then it will be suitable for measurement by the QMA401.

The analyzer is designed to automatically regulate the flow rate. However, the sample pressure and back pressure must match what is shown on the calibration certificate typically 1 barg (14.5 psig) sample pressure with the oulet at atmospheric pressure, and should be controlled using a high-quality pressure regulator on the gas inlet and a back pressure regulator on the outlet.

General guidelines to be followed when setting-up a sampling system are as follows:

OPERATION

• Ensure that the sample is representative of the gas under test

To ensure that the sample is representative of the process being monitored, the sample point should be as close to the critical measurement point as possible. Also, never sample from the bottom of a pipe where entrained liquids may be drawn into the instrument’s sample input line.

• Minimize the ‘dead space’ in sample lines

Dead space in sample lines causes moisture entrapment points, increased system response times or measurement errors as the trapped moisture is released into passing sample gas, producing an increase in partial vapor pressure.

Avoid the use of too many T-pieces, in-line couplings or other unnecessary pipework. Sample pipework should, ideally, be specially designed for each application rather than adapted from that previously installed for another application. Dead space in sample lines increases response time by holding water molecules which are more slowly released to the passing gas sample.

• Remove any particulate matter or oil from the gas sample

Particulate matter can damage the sensors. If particulate matter, such as degraded desiccant, pipe scale and rust are likely to be present in the sample gas, use a particulate in-line filter. Michell Instruments’ technical sales department can be contacted for advice.

Michell Instruments 39

OPERATION

• Use high quality sample pipe fittings

The sample pipework must be capable of withstanding the operating pressure of the sample line. Wherever possible, always use stainless steel pipework and fittings. This is particularly important at low dew points since other materials, e.g. nylon, have hygroscopic characteristics and adsorb moisture on the tube walls, giving rise to slower measurement response and, under certain circumstances, false dew points. For temporary applications, or where stainless steel pipework is not practicable, use high quality, thick-walled PTFE piping, which exhibits similar qualities to stainless steel.

In order to maximize response time, always use the shortest run of pipework and the smallest bore possible, taking care not to induce pressure differentials by aiming for too high a flow rate through too small a bore. Michell Instruments supplies a range of precision pressure fittings suitable for use with the QMA401 instrument. Contact Michell Instruments for details of the items available.

• Gas samples

QMA401 User’s Manual

Generally, if the sample gas (in conjunction with water vapor) is not corrosive to base metals, it will be suitable for measurement by the QMA401 instrument. Gases containing entrained solids should be filtered before application to the instrument.

Care should be taken with gas mixtures containing potentially condensable components in addition to water vapor, e.g. oil, to ensure that only water vapor is present in the sample. Once present on the surface of the sensors, oil will not dry out and will contaminate and damage them.

• Material of construction

All materials are permeable to water vapor, as the water molecule is extremely small compared to the structure of solids, even when compared to the crystalline structure of metals.

Many materials contain moisture as part of their structure, particularly organic materials, salts and anything which has small pores. It is important to ensure that the materials used are suitable for the application.

If the partial water vapor pressure exerted on the outside of a compressed air line is higher than on the inside, the atmospheric water vapor will naturally push through the porous medium against a dry air water vapor pressure. Water will migrate into the pressurized air line, this effect is called transpiration.

Over a long pipe run water will inevitably migrate into any line even through the most resistant materials. Moisture on the outlet of the line will be different than on the inlet. The best material to resist transpiration is 316L stainless steel.

It is also important to note that temperature changes can increase the tendency of these materials to affect the humidity of the surrounding air. With a given surface and gas composition, increases of line pressure and decreases in temperature increase surface adsorption.

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• Pipe material surface finish

Components with a smooth mechanical finish are always preferred. Do not confuse the term electro-polished with a mechanical polishing procedure. Electro-polishing normally is preceded by mechanical polishing to achieve the best results. If a choice of finish is available for the materials dictated by the process or sample system, select the smoothest for faster response.

• Pipe diameter

The larger the sampling pipe diameter, the more exposed the gas will be to the pipe wall. Therefore it is recommended to use the smallest possible pipe diameter to minimize the previously mentioned effects. This must be balance with the desired response speed. Depending on the configuration 1/8” pipe diameter is recommended. Please contact Michell Instruments if further recommendations are needed.

OPERATION

• Ambient temperature variation

The QMA401 is extremely sensitive to moisture fluctuations and ambient temperature variations will affect the equilibrium conditions. In a stable environment, the water vapor pressure within a closed system is in equilibrium with the outside ambient. If the ambient temperature increases, the energy is imparted to the gas pipes and the water molecules within the wall. This additional energy will upset the original equilibrium and the increased pressure water in the walls migrates in towards the drier gas stream.

Small molecules such as water will migrate through the pipe wall until the entire system reaches a new equilibrium. It is possible to minimize this effect on a sampling system by heat tracing sample lines and insulating/heating the sampling system enclosure to a stable temperature above the maximal ambient temperature.

It is important to control the temperature of all components of the sampling system, including regulators and lines. For this reason it is strongly advised to use heat traced line to eliminate this temperature change effect and measure moisture content solely related to the gas under test.

Michell Instruments 41

OPERATION

3.9 Measurement Cycle

At the beginning of a measurement cycle V1 is energized. This allows the dried sample gas to be routed to the sensor cell for a period of 30 seconds as shown by the red line

Figure 25

in between the sensor and reference crystals is measured (i.e. dry state).

The sample and calibration gas paths are shown in green. These lines are continually purged during the initial measurement cycle.

. During this first phase of the measurement cycle the frequency difference

HE1 HE2

QMA401 User’s Manual

SAMPLE

MFC

QCH PS

V1 V2 V3

FC1

QCH

FC2 FC3

MFC

Key

Desiccant column Mass flow controller Sensor cell

Pressure sensor

V1, V2, V3

HE1, HE2 FC1, FC2, FC3

Moisture generator Solenoid valves Heat exchanger

Flow control

SAMPLE

OUT

Figure 38

Measurement Cycle (Phase 1) - Dried Sample Flow

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After a 30 second sampling period, V1 is de-energized. This cuts off the dried gas supply to the sensor cell and V3 is energized connecting the sample gas (red line - see

to the sensor cell for a further period of 30 seconds. The reference and sample gas

26)

paths are shown in green. These lines are continually purged during this second phase of the measurement cycle.

HE1 HE2

V1 V2 V3

OPERATION

Figure

SAMPLE

MFC

QCH PS

FC1 FC2 FC3

QCH

MFC

Key

Desiccant column Mass flow controller Sensor cell

Pressure sensor

V1, V2, V3

HE1, HE2 FC1, FC2, FC3

Moisture generator Solenoid valves Heat exchanger

Flow control

SAMPLE

OUT

Figure 39

Measurement Cycle (Phase 2) Calibration Flow

During this second phase of the measurement cycle the frequency difference between the reference and sensor crystals is measured again (i.e. wet state). After signal processing the measured difference in frequency between the wet and dry phases is proportional to the moisture content of the sample gas.

Michell Instruments 43

OPERATION

3.10 Calibration Cycle

To maintain the precision of the analyzer, the unit can self calibrate and adjust its internal reference table based on the result.

This is achieved as follows:

An internal moisture generator uses a permeation tube to generate a nominal moisture content of 0.5, 5 or 50 ppm

The calibration is carried out in a two phase cycle. Initially V1 is energized, causing the dried sample gas to be routed to the sensor cell for a period of 30 seconds, as shown by the red line in

Figure 27.

QMA401 User’s Manual

, depending on what was specified at the time of order.

SAMPLE

HE1 HE2

V1 V2 V3

FC1

QCH

FC2 FC3

MFC

Key

Desiccant column

Moisture generator

SAMPLE

OUT

MFC

QCH PS

Mass flow controller Sensor cell

Pressure sensor

Figure 40

Calibration Cycle (Phase 1) - Dried Sample Flow

V1, V2, V3

HE1, HE2 FC1, FC2, FC3

Solenoid valves Heat exchanger

Flow control

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At the close of this 30 second sampling period, V1 is de-energized, and V2 is energized; so that the reference gas from the moisture generator is now routed to the sensor cell. This is the beginning of phase 2, see

The calibration reference gas is measured for a further 30 seconds, until V2 is de-energized and the cycle begins again.

The inactive sample paths are continually purged during each phase (see green flow paths

Figures 25 and 26)

HE1 HE2

OPERATION

Figure 28.

SAMPLE

MFC

QCH PS

V1 V2 V3

FC1 FC2 FC3

QCH

MFC

Key

Desiccant column Mass flow controller Sensor cell

Pressure sensor

V1, V2, V3

HE1, HE2 FC1, FC2, FC3

Moisture generator Solenoid valves Heat exchanger

Flow control

SAMPLE

OUT

Figure 41

Calibration Cycle (Phase 2) - Sample Flow

The analyzer will run though a number of 'settling cycles' to ensure the internal sample system is fully equilibrated with the calibration gas before beginning to collect calibration data.

After the system has carried out the selected number of settling cycles, it begins the calibration cycles. During these cycles, the difference between the calibration reference gas and the dried gas is measured. As the moisture content of the calibration gas is known, the difference between this and the measured value is equal to the error in the system.

The QMA401 stores this measured calibration value and automatically compensates subsequent sample readings for any offset that may have occurred to the factory calibration curve.

Michell Instruments 45

MAINTENANCE

4 MAINTENANCE

The design of the QMA401 and measurement system is such that minimal maintenance is required. However, if a fault does occur with the system that is not covered within this manual please contact Michell Instruments (see contact information at www.michell. com) or your local representative.

QMA401 User’s Manual

Gas line connections to the measurement system must be isolated and de-pressurized before any work commences.

Any loose or disturbed pipework or couplings must be leak

tested.

Any maintenance of this product should only be conducted by suitably trained personnel. Any unauthorized maintenance of this product not covered by this manual could invalidate the product warranty.

In addition to general maintenance procedures which involve the cleaning of the instrument’s casing and display, the desiccant column can be removed and replaced by the operator.

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4.1 Removal and Replacement of the Power Supply Fuse

The fuse can be serviced in the field by an approved Michell Instruments' service technician. Please consult your Michell service representative for spare or replacement parts.

4.2 Removal and Replacement of the Dryer Module

1. Undo push-catch to open dryer access panel.

MAINTENANCE

2. Remove supplied spanner/wrench from the mount on the dryer access panel.

3. Loosen the VCR fittings on the dryer module using the supplied spanner/ wrench.

4. Disconnect the VCR fittings by hand.

Michell Instruments 47

MAINTENANCE

5. Remove dryer module.

6. Fit replacement dryer module, following these instructions in reverse to re-assemble.

QMA401 User’s Manual

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QMA401 User’s Manual

5 CALIBRATION

5.1 Traceability

The calibration of this analyzer is traceable to NPL (UK) and NIST (US). A nine-point certificate is supplied with every analyzer.

If these facilities are not available the analyzer must be returned to the manufacturer, Michell Instruments, or one of their approved agents. A list of worldwide Michell Instruments’ offices is provided at www.michell.com.

The analyzer is calibrated at a fixed pressure over the sensing crystals, and the analyzer’s calibration is only valid while the inlet pressure and back pressures have been set correctly.

CALIBRATION

Figure 42

shows a typical calibration certificate.

Michell Instruments 49

CALIBRATION

QMA401 User’s Manual

Figure 42

50 97450 Issue 2, March 2018

Typical QMA401 Calibration Certificate

QMA401 User’s Manual

6 APPLICATION SOFTWARE OVERVIEW

With the QMA Application Software you can:

• Read and edit all main analyzer parameters

• Chart and log all main analyzer parameters

• Perform a calibration

• Reset the analyzer to factory defaults

Communication between the application software and analyzer is via Modbus RTU over RS485.

6.1 System Requirements

For the best software performance, the host computer should meet the following minimum requirements:

APPLICATION SOFTWARE

O/S Windows XP, Windows VISTA, Windows 7 (32-bit or 64-bit), Windows 8

(32-bit or 64-bit)

CPU Intel Pentium III 500 MHz (recommended: Pentium 4 1.6 GHz or Pentium

M 1.0 GHz, or Athlon 1.2 GHz or higher) RAM 512 MB (recommended: 1.0 GB) Disk space Application = 3 MB

6.2 System Connection

If using an RS485 connection - connect the communications cable and RS485 to RS232 converter to a spare serial port or serial to USB adaptor on the host computer.

If using USB - connect the analyzer directly to the host computer using a USB cable after installing the application software.

If using Modbus TCP - connect the analyzer to a LAN using an Ethernet cable.

For information the default serial settings are:

Baud 9600 Parity NONE Data bits 8 Stop bits 1

Michell Instruments 51

APPLICATION SOFTWARE

6.3 Getting Started

On launching the software the connection console will appear, allowing you to establish communications between the software and QMA analyzer.

Choose the Modbus slave address (default is 1) and the serial COM port that the instrument is connected to.

QMA401 User’s Manual

Click the 'Connect...' button.

After a few seconds the software will report a successful connection or not. If the connection is successful, the word 'Connected' and a green tick will appear.

Click the 'Continue' button to continue onto the main acquisition window.

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6.3.1 Connection Method (Serial Connection (RS485 or USB)

Select the COM port to which the analyzer is connected.

6.3.1.1 RS485 Connection

An RS485 to RS232 converter must be used when connecting to a computer's built in serial port, or when connecting to a RS232 to USB adaptor.

To find the COM port number of assigned to a USB to RS232 adapter, open Windows 'device manager' and expand the 'Ports (COM & LPT)' branch.

The USB to RS232 adapter should be listed in this branch, together with the COM port number.

APPLICATION SOFTWARE

6.3.1.2 USB Connection

If directly connecting via USB, the analyzer will appear in Device Manager as a virtual serial port with the name 'Michell Instruments USB to UART Bridge Controller', followed by its assigned COM port number, e.g. COM3.

6.3.1.3 Modbus TCP Connection (Ethernet)

Enter the IP address and port number of the analyzer. The instrument IP and port should be first configured in the Ethernet menu. See section 3.7.6 for further information.

Michell Instruments 53

APPLICATION SOFTWARE

6.4 Main Window

The application software will automatically begin acquiring, displaying and charting data from the analyzer once a connection has been established.

Data acquisition occurs approximately every 2 seconds. The chart update rate is 2 seconds but this may be changed by using the chart options window.

Data logging does not start automatically, this is indicated by the text 'NOT LOGGING' on the Main Screen. Click the 'Data Logging' button to launch the data logging setup window.

QMA401 User’s Manual

To configure analyzer parameters, click the 'Parameters / Field calibration' button to launch the parameters window.

Click the 'Connect' button to re-connect with the analyzer or connect with a new analyzer.

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6.5 Using the Chart

Chart mode buttons

The chart defaults to plot mode.

To change the chart mode, click one of the buttons along the top of the chart, described below.

Function Description

PLOT SCROLL-X SCROLL-Y SIZE-X SIZE-Y ZOOM BOX

OPTIONS

Puts chart into live plot mode Allows the user to scroll the X-axis left and right Allows the user to scroll the Y-axis up and down Allows the user to size the X-axis Allows the user to size the Y-axis Allows the user to draw a box in the data area which will zoom in on

the data within the box. The box is drawn from top-left to bottom-right

Invokes the chart options window

APPLICATION SOFTWARE

After using the scroll, size or zoom modes, changing the chart back to plot mode resets the X and Y axes.

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APPLICATION SOFTWARE

6.5.1 Chart Options Window

The Chart Options Window allows the user to configure the following chart properties:

Function Description

Show/hide series

Restore on plot mode

Y-axis scale

Update rate Allows the user change the update rate of the chart Reset chart Clears all chart data

QMA401 User’s Manual

Allows the user to show or hide data series from the chart. Tick to show, untick to hide

When ticked, selecting plot mode will restore the X and Y axis to the state before they were modified (after sizing, zooming or scrolling)

Select either 'autoscale all data' or 'manual scaling' of the Y-axis. Selecting manual scaling will show a min and max input text box

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6.6 Data Logging

Click the 'Data Logging' button on the Main Window to launch the Data Logging Setup Window.

APPLICATION SOFTWARE

Choosing a log file filename

Choose a log file manually by clicking the

Click the 'Auto generate' button to generate a filename based on the current date and time.

An auto generated log file filename has the following format:

QMA dd-mm-yy hh:mm:ss.log

where dd = date, mm = month, yy = year, hh = hour (24 hr), mm = minutes and ss = seconds

Example:

QMA 15-12-14 13.41.55.log

which is 15th December 2014 at 1.41.55 pm

Auto generated log files are stored in the local My Documents folder

button.

C:\Users\username\Documents\ C:\Documents and Settings\username\Documents\

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APPLICATION SOFTWARE

6.6.1 Configuring Logging Start Time

Logging may be started immediately or at a user-defined time in the future.

QMA401 User’s Manual

To start logging immediately, select the 'Start when

To start logging at a user-defined time in the future, select the 'Start at this date/time:' option and enter the date and time when you wish to start logging.

6.6.2 Configuring Logging Stop Time

If the 'Stop when STOP is clicked' option is selected, then the software will continue logging indefinitely until either the 'STOP' button is clicked or the software is shut down.

If the 'Stop at this date/time' option is selected then the software will continue logging until the selected date and time is reached or when the 'STOP' button is clicked or the software is shut down.

6.6.3 Starting the Log

After choosing a filename and configuring logging start and stop times, click the 'START' button.

6.6.4 Viewing a Log

Click the 'view log file' button to view a log file within Windows notepad.

6.7 Parameters / Field Calibration

START is clicked' option.

Analyzer parameters may be viewed and edited via this window.

Current (live) values are shown in the 'Value now' column. New values may be entered in the 'Adjust' column. When a value is modified it will be shown in red and the 'Apply' button will enable.

Click the 'Apply' button to apply the modified values to the analyzer.

To write the PC date and time to the analyzer, first click the 'Get PC date/time' button to load the values into their respective positions on the screen, then click the 'Apply' button.

To reset the analyzer to factory defaults, press the 'Do it...' button under the Factory Defaults heading.

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6.7.1 Field Calibration

This window allows manual analyzer calibrations to be performed, and settings for automatic calibrations configured.

APPLICATION SOFTWARE

Michell Instruments 59

SHIPPING

7 SHIPPING

7.1 Preparation for Shipping and Packing

For shipping purposes, the instrument should be packed into its original carton, the latter providing the recommended degree of protection during transit.

To prepare the instrument for shipping, proceed as follows:

1. Switch off the instrument, isolate the power supply and remove the power supply cable.

2. Remove the analog connector and alarm output connectors.

3. Isolate the incoming sample line and remove the connections to the GAS IN and GAS OUT ports.

4. Re-fit the VCR blanking caps supplied to the GAS IN and GAS OUT ports.

*NOTE: This step is important to prevent reduction of dryer life*

QMA401 User’s Manual

5. Pack the instrument in its original case by first fitting the end packing, and lowering the instrument into the carton. Place any accessories being returned in the accessories box and place in the carton last.

6. Create a packing list detailing all equipment contained in the box, place it inside the box and seal the box. Ideally, for extra security, the box should be banded.

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APPENDIX A

Appendix A

Technical Specifications

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APPENDIX A

QMA401 User’s Manual

Appendix A Technical Specification

Performance

Measurement Technology

Calibrated Range 0.1 to 700ppm Measurement Range 0.1 to 2000ppm

Accuracy

Repeatability

Detection Limit 0.1 ppm Available Units ppmV, ppmW, mg/m3, vapor pressure (Pa), frost point (°C), lbs/MMscf

Response Speed

Automatic Calibration Internal moisture generator source calibrated traceable to NPL & NIST Sensitivity

Fast Response Quartz Crystal Microbalance

±10% of reading from 1 to 2000 ppm ±0.1 ppmV between 0.1 & 1 ppm

±5% of the reading from 1 to 2000 ppm ±0.1 ppmV between 0.1 & 1 ppm

T63 <2 mins to step change in either direction T95 <5 mins to step change in either direction

0.1ppmV or 1% of reading, whichever is greater

Electrical Specifications

Supply Voltage 85 to 264 V AC, 47/63Hz, 110 to 300 V DC Max Power

Consumption

111W

1 x System Alarm, volt-free change-over (FORM C)

Alarms

3 x process alarms, selectable for various parameters, volt free changeover (FORM C)

Analog Outputs: 2 channels, user selectable 4-20 mA or 1 to 5 V

Communications

Digital Communications: RS485/USB Modbus RTU, Ethernet Modbus TCP

Data logging

Logging to SD card at user-selectable interval or to PC via application software

Local Interface 7” color touch screen LCD

Operating Conditions

Inlet Pressure

Outlet Pressure Atmospheric Sample Flow 300ml/min total flow without bypass Sample Gas

Temperature Operating Environment +5 to +45°C (+41 to +113°F) up to 90% RH

1 barg max (14.5psig) With optional inlet pressure regulator: 300 barg max (4351psig)

0 to +100°C

Mechanical Specifications

Enclosure 19" Rackmount, 4U x 434 mm Gas Connections 1/4” VCR(M) Weight 13.5 kg (29.8 lbs)

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APPENDIX B

Appendix B

Calculating Conversion

Factors for Gas Mixes

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APPENDIX B

QMA401 User’s Manual

Appendix B Calculating Conversion Factors for Gas Mixes

Setting the correct flow rate is crucial to correct operation of the QMA401. If the gas being sampled contains multiple components, then the conversion factor must be calculated and entered as a ‘user’ carrier gas.

The conversion factor will be altered for gas mixtures as follows:

C C

mix

Conversion factor for the gas mix

Conversion factor for the gas ‘n’

Conversion factor for the gas ‘n’ in the mix

2 2

n n

For example, if the gas mixture contains:

C C C

0.3

1.395

= 1.000

= 1.395

= 0.7419

= 0.7186

0.7419

0.5

0.7186

0.1

mix

0.8865

10% N 30% Ar 50% CH 10% CO

mix

0.1 1

Below are the conversion factors for some common gases. If the gas you are measuring contains a component that is not on this list, please contact your Michell representative.

1.000 Air

1.395 Ar - Argon

0.742 CH4 - Methane

0.594 C2H2 - Ethyne

0.568 C2H4 - Ethelyne

0.466 C2H6 - Ethane

0.377 C3H6 - Propylene

0.320 C3H8 - Propane

0.238 C4H10 - Butane

0.999 CO - Carbon Monoxide

0.718 CO

1.019 H2 - Hydrogen

1.422 He - Helium

1.446 Kr - Krypton

1.002 N

1.415 Ne - Neon

0.757 NH3 - Ammonia

0.971 NO - Nitrogen Oxide

0.694 N

0.978 O

1.339 XE - Xenon

- Carbon Dioxide

- Nitrogen

O - Nitrous Oxide

- Oxygen

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APPENDIX C

Appendix C

Modbus Register Map

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APPENDIX C

QMA401 User’s Manual

Appendix C Modbus Holding Register Map

All the data values relating to the QMA601 are stored in holding registers. Each of these registers is two bytes (16-bits wide). Some of these registers contain instrument specific values e.g. its own unique system address, IP address values, etc. Others registers hold specific real time data such as temperature.

Each Modbus message has a two part address code, one for the low byte (bits 0 through 7) and one for the high byte (bits 8 through 15). The facility exists for multiple registers, specified by a high and low byte contained in the query message, to be addressed and read by the same message.

The table below describes the instruments' registers with their respective address locations, together with their relevant register configurations and register map definitions.

The register maps below the table define the data allocated to each bit/byte for each register type.

Address#Function Description Read/

Write

0 ModBus Configuration R/W C

1 System Configuration R/W D

2 Alarm Configuration R/W E

3 Analogue Output Configuration R/W F

4 Internal Logging Configuration R/W U

6 PID – Proportional Value R/W A3 0.01-100.00%

7 PID – Integral Value R/W A3 0.01-1000.0%

8 PID – Derivative Value R/W A3 0.01-100.00%

11 Signal Filter Settings R/W W

12 Alarm1 – Low Set point R/W See App A

13 Alarm1 – High Set point R/W See App A

14 Alarm2 – Low Set point R/W See App A

15 Alarm2 – High Set point R/W See App A

16 Alarm3 – Low Set point R/W See App A

17 Alarm3 – High Set point R/W See App A

18 Analogue Out 1 – Low Set point R/W See App A

19 Analogue Out 1 – High Set point R/W See App A

20 Analogue Out 2 – Low Set point R/W See App A

21 Analogue Out 2 – High Set point R/W See App A

22 Fixed Pressure Input Value R/W See App A

23 Next Calibration – Configuration R/W P1

24 User low ppmV limit R/W A3 0.00 to 0.10

25 Next Calibration – Intervals between cal R/W P2

28 Last Cal Day/Month/Year R J

29 Last Cal Details R/W K

30 Last Cal - 1 Day/Month/Year R J

MFC Span in mlm / Gas Number for flow

rate and mol weight correction

Warning Relay Alarm warning selection

mask

Dryer Capacity (ppm) / Moist Gen Capacity

(days)

Next Calibration – External Cal Val – Hi

Word

Next Calibration – External Cal Val – Lo

Word

R/W S

R/W M

R/W 255 / 103 V

R/W I 0.01 to 2000.00 ppmv

R/W I 0.01 to 2000 .00ppmv

Default Register

Config

Notes/ Real Value Range

SCF can be set (for

factory calibration)

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31 Last Cal - 1 Details R K

32 Last Cal – 2 Day/Month/Year R J

33 Last Cal – 2 Details R K

34 Last Cal – 3 Day/Month/Year R J

35 Last Cal – 3 Details R K

36 Last Cal – 4 Day/Month/Year R J

37 Last Cal – 4 Details R K

38 User Gas Flow Correction Val1 R/W A4 0.100 to 10.000

39 User Gas Flow Correction Val2 R/W A4 0.100 to 10.000

40 User Gas Flow Correction Val3 R/W A4 0.100 to 10.000

41 User Gas Mol Weight Val1 R/W A3 0.100 to 500.00

42 User Gas Mol Weight Val2 R/W A3 0.100 to 500.00

43 User Gas Mol Weight Val3 R/W A3 0.100 to 500.00

44 Ext (line) Pressure Sensor Min R/W See App A

45 Ext (line) Pressure Sensor Max R/W See App A

46 Solenoid Hold Power in % R/W A1

47 *Oven Temperature - Cal ADC Val R/W A1 0 to 4095

48 *Internal Pressure – ADC Val 4mA R/W A1 1 to 4095

49 *Internal Pressure – ADC Val 20mA R/W A1 1 to 4095

50 *Analogue Output 1 - DAC 4mA Value R/W A1 0-65535

51 *Analogue Output 1 - DAC 20mA Value R/W A1 0-65535

52 *Analogue Output 2 - DAC 4mA Value R/W A1 0-65535

53 *Analogue Output 2 - DAC 20mA Value R/W A1 0-65535

54 *External Pressure – ADC Val 4mA R/W A1 0 to 4095

55 *External Pressure – ADC Val 20mA R/W A1 0 to 4095

56 *RTC Cal Value – PPM error R/W A1 0-121

57 *Analyzer Serial Number HI WORD R/W

58 *Analyzer Serial Number LO WORD R/W

60 *Osc FW Version Hi Word R I

61 *Osc FW Version Lo Word R I

62 *Osc Table1 DeltaF 01 Hi Word R/W I 0.0001 to 2000.0000

63 *Osc Table1 DeltaF 01 Lo Word R/W I “

64 *Osc Table1 DeltaF 02 Hi Word R/W I 0.0001 to 2000.0000

65 *Osc Table1 DeltaF 02 Lo Word R/W I “

66 *Osc Table1 DeltaF 03 Hi Word R/W I 0.0001 to 2000.0000

67 *Osc Table1 DeltaF 03 Lo Word R/W I “

68 *Osc Table1 DeltaF 04 Hi Word R/W I 0.0001 to 2000.0000

69 *Osc Table1 DeltaF 04 Lo Word R/W I “

70 *Osc Table1 DeltaF 05 Hi Word R/W I 0.0001 to 2000.0000

71 *Osc Table1 DeltaF 05 Lo Word R/W I “

72 *Osc Table1 DeltaF 06 Hi Word R/W I 0.0001 to 2000.0000

73 *Osc Table1 DeltaF 06 Lo Word R/W I “

74 *Osc Table1 DeltaF 07 Hi Word R/W I 0.0001 to 2000.0000

75 *Osc Table1 DeltaF 07 Lo Word R/W I “

76 *Osc Table1 DeltaF 08 Hi Word R/W I 0.0001 to 2000.0000

77 *Osc Table1 DeltaF 08 Lo Word R/W I “

78 *Osc Table1 DeltaF 09 Hi Word R/W I 0.0001 to 2000.0000

79 *Osc Table1 DeltaF 09 Lo Word R/W I “

80 *Osc Table1 DeltaF 10 Hi Word R/W I 0.0001 to 2000.0000

32 bit Integer HI

Word

32 bit Integer LO

Word

APPENDIX C

1 to 4294967296

“

Michell Instruments 67

APPENDIX C

81 *Osc Table1 DeltaF 10 Lo Word R/W I “

82 *Osc Table1 DeltaF 11 Hi Word R/W I 0.0001 to 2000.0000

83 *Osc Table1 DeltaF 11 Lo Word R/W I “

84 *Osc Table1 DeltaF 12 Hi Word R/W I 0.0001 to 2000.0000

85 *Osc Table1 DeltaF 12 Lo Word R/W I “

86 *Osc Table1 Ref 01 Hi Word R/W I 0.0001 to 10000.0000

87 *Osc Table1 Ref 01 Lo Word R/W I “

88 *Osc Table1 Ref 02 Hi Word R/W I 0.0001 to 10000.0000

89 *Osc Table1 Ref 02 Lo Word R/W I “

90 *Osc Table1 Ref 03 Hi Word R/W I 0.0001 to 10000.0000

91 *Osc Table1 Ref 03 Lo Word R/W I “

92 *Osc Table1 Ref 04 Hi Word R/W I 0.0001 to 10000.0000

93 *Osc Table1 Ref 04 Lo Word R/W I “

94 *Osc Table1 Ref 05 Hi Word R/W I 0.0001 to 10000.0000

95 *Osc Table1 Ref 05 Lo Word R/W I “

96 *Osc Table1 Ref 06 Hi Word R/W I 0.0001 to 10000.0000

97 *Osc Table1 Ref 06 Lo Word R/W I “

98 *Osc Table1 Ref 07 Hi Word R/W I 0.0001 to 10000.0000

99 *Osc Table1 Ref 07 Lo Word R/W I “

100 *Osc Table1 Ref 08 Hi Word R/W I 0.0001 to 10000.0000

101 *Osc Table1 Ref 08 Lo Word R/W I “

102 *Osc Table1 Ref 09 Hi Word R/W I 0.0001 to 10000.0000

103 *Osc Table1 Ref 09 Lo Word R/W I “

104 *Osc Table1 Ref 10 Hi Word R/W I 0.0001 to 10000.0000

105 *Osc Table1 Ref 10 Lo Word R/W I “

106 *Osc Table1 Ref 11 Hi Word R/W I 0.0001 to 10000.0000

107 *Osc Table1 Ref 11 Lo Word R/W I “

108 *Osc Table1 Ref 12 Hi Word R/W I 0.0001 to 10000.0000

109 *Osc Table1 Ref 12 Lo Word R/W I “

110 *BLANK3 R/W Don’t Care

111 *Osc Table1 Cal Flow Rate ml/m R/W A2 10-2000 ml/m

112 *Osc Table1 Cal Int Moist Gen Val Hi Word R/W I 0.0001 to 10000.0000

113 *Osc Table1 Cal Int Moist Gen Val Lo Word R/W I “

114

115 *Osc Table1 Cal Date MONTH / YEAR R/W Q 1 to 12 / 0 to 99

116 *Osc Table1 Cal Sample Phase Time R/W A1 10 to 65535 seconds

117 *Osc Table1 Cal Reference Phase Time R/W A1 10 to 65535 seconds

118 *Osc Table1 Cal Settling Cycles R/W A1 4 to 240 cycles

119 *Osc Table1 Cal Calibration Cycles R/W A1 4 to 60 cycles

120 *BLANK R/W Don’t Care

121 *Osc Table1 Cal Cell Pressure Reading R/W A3 0.00 to 10.00 barG

122 *Osc Table1 Cal Beat Freq of Ref R/W A1

123 *Osc Table1 Cal Beat Freq of Moist Gen R/W A1

124 *Osc Table2 DeltaF 01 Hi Word R/W I 0.0001 to 2000.0000

125 *Osc Table2 DeltaF 01 Lo Word R/W I “

126 *Osc Table2 DeltaF 02 Hi Word R/W I 0.0001 to 2000.0000

127 *Osc Table2 DeltaF 02 Lo Word R/W I “

128 *Osc Table2 DeltaF 03 Hi Word R/W I 0.0001 to 2000.0000

129 *Osc Table2 DeltaF 03 Lo Word R/W I “

*Osc Table1 Cal Oven SP degC/ Cal Date

DAY

R/W Q 40 to 80 / 1 to 31

QMA401 User’s Manual

1000 to 15000 (NOT

USED)

1000 to 15000 (NOT

USED)

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130 *Osc Table2 DeltaF 04 Hi Word R/W I 0.0001 to 2000.0000

131 *Osc Table2 DeltaF 04 Lo Word R/W I “

132 *Osc Table2 DeltaF 05 Hi Word R/W I 0.0001 to 2000.0000

133 *Osc Table2 DeltaF 05 Lo Word R/W I “

134 *Osc Table2 DeltaF 06 Hi Word R/W I 0.0001 to 2000.0000

135 *Osc Table2 DeltaF 06 Lo Word R/W I “

136 *Osc Table2 DeltaF 07 Hi Word R/W I 0.0001 to 2000.0000

137 *Osc Table2 DeltaF 07 Lo Word R/W I “

138 *Osc Table2 DeltaF 08 Hi Word R/W I 0.0001 to 2000.0000

139 *Osc Table2 DeltaF 08 Lo Word R/W I “

140 *Osc Table2 DeltaF 09 Hi Word R/W I 0.0001 to 2000.0000

141 *Osc Table2 DeltaF 09 Lo Word R/W I “

142 *Osc Table2 DeltaF 10 Hi Word R/W I 0.0001 to 2000.0000

143 *Osc Table2 DeltaF 10 Lo Word R/W I “

144 *Osc Table2 DeltaF 11 Hi Word R/W I 0.0001 to 2000.0000

145 *Osc Table2 DeltaF 11 Lo Word R/W I “

146 *Osc Table2 DeltaF 12 Hi Word R/W I 0.0001 to 2000.0000

147 *Osc Table2 DeltaF 12 Lo Word R/W I “

148 *Osc Table2 Ref 01 Hi Word R/W I 0.0001 to 10000.0000

149 *Osc Table2 Ref 01 Lo Word R/W I “

150 *Osc Table2 Ref 02 Hi Word R/W I 0.0001 to 10000.0000

151 *Osc Table2 Ref 02 Lo Word R/W I “

152 *Osc Table2 Ref 03 Hi Word R/W I 0.0001 to 10000.0000

153 *Osc Table2 Ref 03 Lo Word R/W I “

154 *Osc Table2 Ref 04 Hi Word R/W I 0.0001 to 10000.0000

155 *Osc Table2 Ref 04 Lo Word R/W I “

156 *Osc Table2 Ref 05 Hi Word R/W I 0.0001 to 10000.0000

157 *Osc Table2 Ref 05 Lo Word R/W I “

158 *Osc Table2 Ref 06 Hi Word R/W I 0.0001 to 10000.0000

159 *Osc Table2 Ref 06 Lo Word R/W I “

160 *Osc Table2 Ref 07 Hi Word R/W I 0.0001 to 10000.0000

160 *Osc Table2 Ref 07 Lo Word R/W I “

162 *Osc Table2 Ref 08 Hi Word R/W I 0.0001 to 10000.0000

163 *Osc Table2 Ref 08 Lo Word R/W I “

164 *Osc Table2 Ref 09 Hi Word R/W I 0.0001 to 10000.0000

165 *Osc Table2 Ref 09 Lo Word R/W I “

166 *Osc Table2 Ref 10 Hi Word R/W I 0.0001 to 10000.0000

167 *Osc Table2 Ref 10 Lo Word R/W I “

168 *Osc Table2 Ref 11 Hi Word R/W I 0.0001 to 10000.0000

169 *Osc Table2 Ref 11 Lo Word R/W I “

170 *Osc Table2 Ref 12 Hi Word R/W I 0.0001 to 10000.0000

171 *Osc Table2 Ref 12 Lo Word R/W I “

172 *BLANK R/W Dont Care

173 *Osc Table2 Cal Flow Rate ml/m R/W A2 10-2000 ml/m

174 *Osc Table2 Cal Int Moist Gen Val Hi Word R/W I 0.0001 to 10000.0000

175 *Osc Table2 Cal Int Moist Gen Val Lo Word R/W I “

176

177 *Osc Table2 Cal Date MMYY R/W Q 1 to 12 / 0 to 99

178 *Osc Table2 Cal Sample Phase Time R/W A1 10 to 240 seconds

*Osc Table2 Cal Oven SP degC / Cal Date

R/W Q 40 to 80 / 1 to 31

APPENDIX C

Michell Instruments 69

APPENDIX C

179 *Osc Table2 Cal Reference Phase Time R/W A1 10 to 240 seconds

180 *Osc Table2 Cal Settling Cycles R/W A1 4 to 240 cycles

181 *Osc Table2 Cal Calibration Cycles R/W A1 4 to 60 cycles

182 *BLANK R/W Dont Care

183 *Osc Table2 Cal Cell Pressure Reading LoW R/W A3 0.00 to 10.00 barG

184 *Osc Table2 Cal Beat Freq of Ref R/W A2

185 *Osc Table2 Cal Beat Freq of Moist Gen R/W A2

186 *Oven Serial Number HI WORD R/W

187 *Oven Serial Number LO WORD R/W

188 *BLANK R/W Dont Care

189 *BLANK R/W Dont Care

190

191

192

193

194 User manual entry SCF value W A4

195 Passcode for protected registers W A1

196 RTC Set Hours/Mins W H Write to set Time

197 RTC Set Day/Month/Year W J Write to set Date

198 Instrument Command Register W T

199

200 Control Board f/w version R A3

201 Moisture – PPMv – Hi Word R I

202 Moisture – PPMv – Lo Word R I

203 Moisture – PPMw – Hi Word R I

204 Moisture – PPMw – Lo Word R I

205 Moisture – mg/m3 – Hi Word R I

206 Moisture – mg/m3 – Lo Word R I

207 Moisture – Pa – Hi Word R I

208 Moisture – Pa – Lo Word R I

209 Moisture – lb/mmscf – Hi Word R I

210 Moisture – lb/mmscf – Lo Word R I

211 Dew point Hi Word in set unit R I

212 Dew point Lo Word in set unit R I

213 Enclosure Temperature in set unit R B2

214 Ext Pressure Reading in set unit R See App A

215 DeltaF Hi Word R I

216 DeltaF Lo Word R I

217 Beat Frequency Hi Word R I

218 Beat Frequency Lo Word R I

219 Oven Temperature in set unit R B3

220 Flow Rate in ml/m R A2

221 Heater Power in % R A2

222 RTC Hours/Minutes R H

223 RTC Seconds R A1

224 RTC Day/Month/Year R J

QMA401 User’s Manual

1000 to 15000 (NOT

USED)

1000 to 15000 (NOT

USED)

32 bit Integer HI

Word

32 bit Integer LO

Word

1 to 4294967296

Write to set SCF value

to use (0.2500 to

4.000)

(NOT USED

CURRENTLY)

“

70 97450 Issue 2, March 2018

QMA401 User’s Manual

225 Ref Seconds Countdown R A1

226 Pressure Reading of cell in set unit R See App A

227 Sample Seconds Countdown R A1

228 Cal Settling / Calibration Cycles Countdown R Q

229 System Status Register R L

230 Warning Flags Register R M

231 Current Flow Correction value R A4

232 Moist Gen Value Read After Cal – Hi Word R I For cal use

233 Moist Gen Value Read After Cal – Lo Word R I For cal use

234 Countdown to Next Cal HHDD R P2

235 Countdown to Next Cal MMSS R Q

236 10 Sample Averaged DeltaF Hi Word R I

237 10 Sampled Averaged DeltaF Lo Word R I “

238 10 Sample Averaged Ppmv Hi Word R I

239 10 Sampled Averaged Ppmv Lo Word R I “

240 Oven Temperature Live Averaged ADC Val R A1

241 Internal Pressure Live Averaged ADC Val R A1

242 External Pressure Live Averaged ADC Val R A1

243

244

245

246

247

248

249

250

251

252 DeltaF Log t0 Hi Word R I For cal use

253 DeltaF Log t0 Lo Word R I For cal use

254 DeltaF Log t1 Hi Word R I For cal use

255 DeltaF Log t1 Lo Word R I For cal use

256 DeltaF Log t2 Hi Word R I For cal use

257 DeltaF Log t2 Lo Word R I For cal use

258 DeltaF Log t3 Hi Word R I For cal use

259 DeltaF Log t3 Lo Word R I For cal use

260 DeltaF Log t4 Hi Word R I For cal use

261 DeltaF Log t4 Lo Word R I For cal use

262 DeltaF Log t5 Hi Word R I For cal use

263 DeltaF Log t5 Lo Word R I For cal use

264 DeltaF Log t6 Hi Word R I For cal use

265 DeltaF Log t6 Lo Word R I For cal use

266 DeltaF Log t7 Hi Word R I For cal use

267 DeltaF Log t7 Lo Word R I For cal use

Dryer Capacity Used / Moist Gen Capacity

Used

Ethernet Settings – IP Address – Upper

Bytes

Ethernet Settings – IP Address – Lower

Bytes

Ethernet Settings – Def Gateway – Upper

Bytes

Ethernet Settings – Def Gateway – Lower

Bytes

Ethernet Settings – Subnet Mask – Upper

Bytes

Ethernet Settings – Subnet Mask – Lower

Bytes

R/W Q

R/W Q “

APPENDIX C

Average of 10 deltaF

Logs - For cal use

Average of 10 ppmv

Logs - For cal use

Volatile – Cannot write

via Modbus, only via

display

Michell Instruments 71

APPENDIX C

268 DeltaF Log t8 Hi Word R I For cal use

269 DeltaF Log t8 Lo Word R I For cal use

270 DeltaF Log t9 Hi Word R I For cal use

271 DeltaF Log t9 Lo Word R I For cal use

272 Ppmv Log t0 Hi Word R I For cal use

273 Ppmv Log t0 Lo Word R I For cal use

274 Ppmv Log t1 Hi Word R I For cal use

275 Ppmv Log t1 Lo Word R I For cal use

276 Ppmv Log t2 Hi Word R I For cal use

277 Ppmv Log t2 Lo Word R I For cal use

278 Ppmv Log t3 Hi Word R I For cal use

279 Ppmv Log t3 Lo Word R I For cal use

280 Ppmv Log t4 Hi Word R I For cal use

281 Ppmv Log t4 Lo Word R I For cal use

282 Ppmv Log t5 Hi Word R I For cal use

283 Ppmv Log t5 Lo Word R I For cal use

284 Ppmv Log t6 Hi Word R I For cal use

285 Ppmv Log t6 Lo Word R I For cal use

286 Ppmv Log t7 Hi Word R I For cal use

287 Ppmv Log t7 Lo Word R I For cal use

288 Ppmv Log t8 Hi Word R I For cal use

289 Ppmv Log t8 Lo Word R I For cal use

290 Ppmv Log t9 Hi Word R I For cal use

291 Ppmv Log t9 Lo Word R I For cal use

292

293

294 Log Buffer Latest Log Pointer R A1

295 Log Buffer Main Val Min – Hi_Word R I

296 Log Buffer Main Val Min – Lo_Word R I

297 Log Buffer Main Val Max – Hi_Word R I

298 Log Buffer Main Val Max – Lo_Word R I

299 Log1 - Hours/Minutes R H

300 Log1 - Day/Month/Seconds R J

301 Log1 - Main Value - Hi_Word R I

302 Log1 - Main Value - Lo_Word R I

303 Log1 - System Status Register R L

304 Log1 - Warning Flags Register R M

305 Log2 - Hours/Minutes R H

306 Log2 - Day/Month/Seconds R J

307 Log2 - Main Value - Hi_Word R I

308 Log2 - Main Value - Lo_Word R I

309 Log2 - System Status Register R L

310 Log2 - Warning Flags Register R M

>>> >>> To log288 R As above

QMA401 User’s Manual

Points to start of latest

log

* Factory Calibration Data

Table 11 Modbus Register Map

72 97450 Issue 2, March 2018

QMA401 User’s Manual

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

A1 — Unsigned Short. Range = 0 to 65535 A2 — Unsigned Short/10. Range = 0 to 6553.5 A3 — Unsigned Short/100. Range = 0 to 655.35 A4 — Unsigned Short/1000. Range = 0 to 65.535 A5 — Unsigned Short/1000. Range = 0 to 65.535

Conversion: Float*x = unsigned integer

Unsigned integer/x = ﬂ oat Or cast: Float value to read = ((ﬂ oat)(value))/x;

Unsigned short value to write = (unsigned short)(value*x)

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

B1 — Signed Short. Range -32768 to +32767 B2 — Signed Short/10. Range -3276.8 to +3276.7 B3 — Signed Short/100. Range -327.68 to +327.67 B4 — Signed Short/1000. Range -32.768 to +32.767 B5 — Signed Short/10000. Range -3.2768 to +3.2767

Most languages will cast from one type to another

Values to write into register manually:

If value is a negative number: (value*x)+65536 If value is 0 or a positive number: value*x E.g. for type B3:

(-5.39*100)+65536 = 64997 (2.01*100) = 201

Or cast: (Unsigned short)(value*x)

Reading Values from register manually:

If value in register is greater than 32767: (value-65536)/x If vaue in register is less than or equal to 32767: value/x E.g. for type B3:

(64997-65536)/100 = -5.39 201/100 = 2.01

Or cast: ((ﬂ oat)((signed short)value))/x;

Michell Instruments 73

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

PT PT IA IA IA IA IA IA IA IA

Instrument Address (IA) Protocol Type (PT)

1 to 31 (1=def) 00=RS485

01=USB VCP 10= Ethernet

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

DC DC CP CP CP CP PS PS PU PU PU TU TU NE

Temperature/Dew Point units (TU) Pressure for Dew-Point Calculations (PS)

00 = C (def) 01 = F

00= Atmospheric (def) 01 = Fixed pressure (User input value) 10 = External Line pressure (Ext sensor)

QMA401 User’s Manual

Pressure Units (PU) Number of cal points to use (CP)

000 = Bar.G (def) 001 = Bar.A 010 = Psi.G 011 = Psi.A 100 = MPa.G 101 = mmHg 110 = MPa.A

Dew-Point Calculation method to use (DC) NAMUR Error level preference

00=IGT 01=ISO 10=Ideal Gas (def)

Note: when a pressure unit or temperature unit is changed then the user must manually change the values for the following to the value in the new selected unit (if relevant).

Minimum 3 and maximum is 12. Any other value is also 12.

0 = low error (3.0mA) 1 = high error (22.0mA)

• Fixed pressure for dew-point calculation

• External line pressure sensor min and max

• Alarm set-points

• Analog output ranges (low and high)

74 97450 Issue 2, March 2018

QMA401 User’s Manual

Note: Alarm 4 is a system fault/warning alarm and is configured in register 9 (Configuration M)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 L4 L3 L2 L1 A3 A3 A3 A3 A2 A2 A2 A2 A1 A1 A1 A1

Alarm1 Parameter (A1) Alarm2 Parameter (A2)

0000 = Moisture – PPMv (def) 0001= Moisture - PPMw 0010 = Moisture – MGM3 0011 = Moisture – PA (wvp) 0100 = Moisture - LBMMSCF 0101 = Dew point 0110 = Oven temperature 0111 = Flow rate 1000 = Cell Pressure 1001 = Ext Line Pressure

Alarm3 Parameter (A3) Alarm Latch Control (L1 to L4)

0000 = Moisture – PPMv 0001= Moisture - PPMw 0010 = Moisture – MGM3 0011 = Moisture – PA (wvp) 0100 = Moisture - LBMMSCF 0101 = Dew point 0110 = Oven temperature 0111 = Flow rate (def) 1000 = Cell Pressure 1001 = Ext Line Pressure

0000 = Moisture – PPMv 0001= Moisture - PPMw 0010 = Moisture – MGM3 0011 = Moisture – PA (wvp) 0100 = Moisture - LBMMSCF 0101 = Dew point 0110 = Oven temperature (def) 0111 = Flow rate 1000 = Cell Pressure 1001 = Ext Line Pressure

L1 = 1 = Alarm1 latch L2 = 1 = Alarm2 latch L3 = 1 = Alarm3 latch L4 = 1 = Alarm4 latch L1 = 0 = Alarm1 don’t latch L2 = 0 = Alarm2 don’t latch L3 = 0 = Alarm3 don’t latch L4 = 0 = Alarm4 don’t latch

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

T2 T1 O2 O2 O2 O2 O1 O1 O1 O1

Ouput1 Parameter (O1) Output2 Parameter (O2)

Michell Instruments 75

APPENDIX C

QMA401 User’s Manual

0000 = Moisture – PPMv (def) 0001 = Moisture - PPMw 0010 = Moisture – MGM3 0011 = Moisture – PA 0100 = Moisture - LBMMSCF 0101 = Dew point 0110 = Oven temperature 0111 = Flow rate 1000 = Cell Pressure 1001 = Ext Line Pressure

Output Type – (T1 to T2)

0 = 4–20 mA 1 = 1–5V

0000 = Moisture – PPMv 0001= Moisture - PPMw 0010 = Moisture – MGM3 0011 = Moisture – PA 0100 = Moisture - LBMMSCF 0101 = Dew point (def) 0110 = Oven temperature 0111 = Flow rate 1000 = Cell Pressure 1001 = Ext Line Pressure

(Where T1 is CH1 and T2 is CH2)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

HH HH HH HH HH HH HH HH MM MM MM MM MM MM MM MM

Hours Number (HH) Minutes Number (MM)

00 to 23 00 to 59

IEEE-754 single precision floating point format. This format is 'Big Ended' which means that the high byte is at a lower address in memory than the Lo byte, and is represented as such in the register memory map. The IEEE-754 format is shown below.

Bit 31 Bits 30 to 23 Bits 22 to 0

Sign bit 0 = + 1 = -

Exponent Field Has a +127 bias value

mantissa Decimal representation of binary. Where 1.0 <= value < 2.0

Examples of floating point to HEX are shown below:

1. +10.3

sign bit = 0 Exponent = 3, therefore exponent field = 127 + 3 = 130 , and bits 30 to 23 = 1000 0010 The mantissa = 1.2875 which in binary representation = 1010 0100 1100 1100 1100 1101

Adjusting the mantissa for the exponent moves the decimal point to the right if positive and to the left if negative.

As the exponent is = 3 then the mantissa becomes = 1010 0100 1100 1100 1100 1101, therefore:

1010 = (1x23) + (0x22) + (1x21) + (0x20) = 10 and 0100 1100 1100 1100 1101 = (0x2-1) +(1x2-2) + -- + (1x2-20) = 0.3

Therefore the word value = 0100 0001 0010 0100 1100 1100 1100 1101 = 4124CCCD

76 97450 Issue 2, March 2018

QMA401 User’s Manual

Consequently hi word= 4124 and lo word = CCCD

2. - 0.0000045

sign bit = 1 Exponent = -18, therefore exponent field = 127 + (-18) = 109 , and bits 30 to 23 = 0110 1101 The mantissa = 1.179648 which in binary representation = 1001 0110 1111 1110 1011 0101

i.e. (1x2-18) + (1x2-21) + (1x2-23) etc. = 0.0000045

Therefore the word value = 1011 0110 1001 0110 1111 1110 1011 0101 = B696FEB5

APPENDIX C

Michell Instruments 77

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

DD DD DD DD DD MM MM MM MM YY YY YY YY YY YY YY

Date Number (DD) Month Number (MM)

1 to 31 1 to 12

Year Number (YY) or Seconds

00-99 for year or 00-59 for seconds

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MA IE UE CF CF CF CF CF CF CF CF CF CF CF CF

QMA401 User’s Manual

Correction Factor (CF) Manual or Auto (MA)

1 to 4000 /1000.0 = 0.2500 to 4.000 0=Manual

1=Automatic

Internal or External (IE) User Entry (UE)

0=Internal 1=External

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 A4 A4 A3 A3 A2 A2 A1 A1 SS PS DH SM SM CP CP

Cycle Phase (CP) System Mode (SM)

00= Reference phase 01= Sample Phase 10 = Cal Phase (internal or external)

Relay Alarm Status ﬂ ags (A1, A2, A3, A4) Setup Status (SS)

Example: A1 = 00=OK (relay de-energised) A1 = 01=High (or Fault)(relay energised) A1 = 10=Low (relay energised) A1 = 11= Latched (relay latched but condition now ok)

Purge Status (PS) Current Data Hold Status

0=Not purging 1=Purging (System in Setup mode and only REF solenoid is energised)

1= CF manually written by user 0 = CF generated via calibration

00= Standby 01= Measurement 10 = Calibration

0 = Setup mode is OFF 1 = Setup mode is ON

0 = Data is currently not held 1 = Data is currently held

78 97450 Issue 2, March 2018

QMA401 User’s Manual

APPENDIX C

1=Warning or fault, 0=OK

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Bit HEX Warning Condition

Oven temperature unstable. Oven temperature has not been

0 0001

stable within ±0.01C of setpoint for continuous 5 minutes. (Process alarms de-energized, both analog outputs at fault condition

1 0002

2 0004

Enclosure temperature too high. Enclosure (System) temperature too high. (> Oven temperature setpoint -2°C)

Flow control error. MFC Flow control error (by >5ml/m of ﬂ ow

target) 3 0008 Cell pressure sensor error. (under 4 mA, over 20 mA or no signal) 4 0010 Ext Press sensor error. (under 4 mA, over 20 mA or no signal)

Field cal error. Internal moist generator drift, instrument excessive

5 0020

drift or desiccant dryer deterioration requiring very large corr. factor

(<0.2500 or >4.000). In this case the correction factor would be set

to 1.0. (Checked after ﬁ eld calibration)

6 0040

7 0080 ppmV over range. ppm

Beat freq. out of range. Beat frequency Under/Over acceptable

range (<1500 Hz, >20000 Hz)

over instrument range (>2000ppmV)

Oven temperature sensor fault. Oven temperature sensor fault 8 0100

(Process Alarms de-energized, Fault Alarm Active, both Analog

outputs at fault condition (ADC <10, >4000 counts) 9 0200 mA output 1 error. (o/c or high resistance at output)

10 0400 mA output 2 error. (o/c or high resistance at output)

11 0800

12 1000

13 2000

14 4000

15 8000

Oscillator board comms error. Oscillator board comms. error or

board not present (checked on startup)

Ethernet board comms. error. Ethernet Board comms. error or

board not ﬁ tted (checked on startup)

Dryer due for service. Desiccant Dryer due for service or

replacement (>5000000ppm

)

Moisture generator due for service. Internal Moisture Generator

due for service or replacement (>1030days)

Calibration Alarm

In calibration mode or data held (or both)

Analyzer Status Alarm selection mask (in Register 9) allows user to set which condition(s) trigger status relay alarm 4.

Michell Instruments 79

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MA IE DH MG AC AC AC AC AC AC AC AC

Manual or Auto (MA) Internal or External (IE)

0 = Manual 1 = Auto

Data Hold (DH) Data Hold Additional Cycles (AC)

0 = oﬀ 1 = on

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

IH IH IH IH IH ID ID ID ID ID ID ID ID ID ID

0 = Internal 1 = External

0 to 240 cycles

QMA401 User’s Manual

Hour of Day (IH) Interval Days (ID)

0 to 23 1 day to 365 days

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

MS MS MS MS MS MS MS MS MS MS MS GN GN GN GN GN

MFC Span in ml/m (MS) Gas Number (GN)

0 to 2000 ml/m 0 to 23 Gases (see Appendix D.1 for details).

Writing relevant number to this register initiates associated setting, calibration or test function

* Means only for Michell Factory use

** Put is setup mode first and then after test put back into measurement mode

2 = Set Cell Pressure 4 mA ADC Value*

3 = Set Cell Pressure 20 mA ADC Value*

4 = Set Ext Pressure 4 mA ADC Value*

5 = Set Ext Pressure 20 mA ADC Value*

80 97450 Issue 2, March 2018

QMA401 User’s Manual

6 = Send Test String to Sensor Comms Channel*

7 = Send Test String to Display Comms Channel*

10 = Force Analog Output 1 to 4 mA**

11 = Force Analog Output 1 to 20 mA**

12 = Force Analog Output 2 to 4 mA**

13 = Force Analog Output 2 to 20 mA**

14 = Force Analog Output 1 to 12 mA**

15 = Force Analog Output 2 to 12 mA**

19 = All Alarm Relays de-energised

20 = Set Alarm Relay1**

21 = Set Alarm Relay2**

22 = Set Alarm Relay3**

23 = Set Alarm Relay4**

25 = Set REF Solenoid* (uses 100% power to solenoid)**

APPENDIX C

26 = Set SAMPLE Solenoid* (uses 100% power to solenoid)**

27 = Set CAL Solenoid* (uses 100% power to solenoid)**

28 = All Solenoids Off* (uses 100% power to solenoid)**

30 = Set RTC Calibration ppm error value*

35 = Set Defaults Osc Board*

36 = Set Defaults Main Board* (Does not default the main board calibration values).

50 = Set System Mode to Standby (all solenoids off and no phase countdown)*

51 = Set System Mode to Measurement if in Cal mode (i.e. Abort Cal) OR Set to Manual Cal if in Auto cal countdown mode

52 = Set System Mode to Calibration if manual cal option set OR Start Auto Cal countdown mode if Auto Cal option set. (Only if oven temperature has become stable).

60 = Start on board SD Logging (Open log file)*

61 = Stop on board SD logging (Close log file)*

65 = Enter Board Setup Mode* (Normal measurement cycle and output/alarm updates are stopped)

66 = Exit Board Setup Mode*(Normal measurement cycle and output/alarm updates are re-started)

67 = Reset Ram Log Buffer and Stats to zeros

68 = Set Ethernet Settings (to values in Registers 245 to 250) – (Command not allowed via modbus)

70 = Reset Dryer Service flag and ppm sum register to 0.0ppm

71 = Reset Moist Generator Service flag and hours used counter to 0hr

74 = Clear Alarm1 Latch

75 = Clear Alarm2 Latch

76 = Clear Alarm3 Latch

77 = Clear Alarm4 (Fault) Latch

78 = Start Purge (Ref solenoid energised, all others de-energised. System in Setup mode)

79 = Stop Purge (System reverts to normal measurement mode)

Michell Instruments 81

APPENDIX C

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

RL RL RL RL DP DP DP DP

DeltaF and ppmV Log Interval in cycles (DP) Ram Buﬀ er Log parameter (RL)

Range is 1 to 15 cycles. (for CAL use, def = 1) 0000 = Moisture – PPMv (def)

0001= Moisture - PPMw 0010 = Moisture – MGM3 0011 = Moisture – PA (wvp) 0100 = Moisture - LBMMSCF 0101 = Dew point 1111 = No logging

QMA401 User’s Manual

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

DC DC DC DC DC DC DC DC ML ML ML ML ML ML ML ML

Dryer Capacity or Used (DC) – in ppm Moisture Gen Capacity or Used (ML) – in

0 to 255 x 100,000 represents 0 to 25,500,000 in 100,000 steps.

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

BeatF Median Filter (BF) Setting DeltaF Median Filter (DF) Sample size

5 sample Median ﬁ lter to remove spikes

1=Median of 1 (middle value) 3=Median of 3, averaged (default)

V — Internal Logging Configuration/Service Interval Days

Days

0 to 255 x 10 Represents 0 to 2,550 days (61200 hours) in 10 day steps

BF BF DF DF DF DF DF

4-24 = Sample size of ﬁ lter to smooth signal (default=12)

< 4 or >24 = OFF

Any other value = OFF

82 97450 Issue 2, March 2018

QMA401 User’s Manual

APPENDIX C

C.1 Set Points and Ranges

Set points and ranges for Analog Outputs, Alarms, Fixed User Pressure, Cell Pressure and External (line) Pressure sensor.

Unit

ppm

Adjustment Range/Res.

Default Values Register Range Register Type

0.0 to 3000.0 0.0 to 2000.0 0-30000 A2 (unsigned short/10)

ppm

0 to 40000 0 to 40000 0 to 40000 A1 (unsigned

short)

mgm

0 to 20000 0 to 20000 0 to 20000 A1 (unsigned

short)

Pa 0.0 to 3000.0 0.0 to 3000.0 0 to 30000 A2 (unsigned

short/10)

dew point degC -120.0 to +20.0 -100.0 to 0.0 -1200 to 200 B2 (signed

short/10)

dew point degF -184.0 to +68 -148.0 to 32.0 -1840 to 680 B2 (signed

short/10)

lbmmscf 0 to 60000 0 to 60000 0 to 60000 A1 (unsigned

short)

Oven T degC -50.0 to +100.0 59.9 to 60.1 -500 to 1000 B2 (signed

short/10)

Oven T degF -58.0 to +212.0 139.8 to 140.2 -580 to +2120 B2 (signed

short/10)

Flow, ml/m 0.0 to 300.0 90.0 to 110.0 0 to 3000 A2 (unsigned

short/10)

Pressure, Psi.G 0.0 to 3000.0 0.0 to 3000.0 0 to 30000 A2 (unsigned

short/10)

Pressure, Psi.A 14.7-3014.7 15.0-3015.0 147 to 30147 A2 (unsigned

short/10)

Pressure, Bar.G 0.00 to 204.08 0.00 to 204.00 0 to 20408 A3 (unsigned

short/100)

Pressure, Bar.A 1.00 to 205.08 1.00 to 205.00 1 to 20508 A3 (unsigned

short/100)

Pressure, MPa.G 0.01 to 20.78 0.01 to 21.00 1 to 2078 A3 (unsigned

short/100)

Pressure, mmHg 750 to 65535

(limited)

750 to 65000 0 to 65535

(limited)

A1 (unsigned short)

Pressure, MPa.A 0.01 to 20.78 0.01 to 21.00 1 to 2078 A3 (unsigned

short/100)

Pressure MPa.A 0.01 to 20.78 0.01 to 21.00 1 to 2078 A3 (unsigned

short/100)

Michell Instruments 83

APPENDIX C

C.2 Gases for Gas Correction Values

Gases for gas correction values, indexed 0 to 23. If a USER gas is selected then the instrument will use the gas correction values that are set in the respective registers 38, 39 and 40 for the Flow correction and at registers 41, 42 and 43 for the molecular weights.

0 = Air - Mixture 12 = He - Helium 1 = Ar - Argon 13 = Kr - Krypton 2 = CH4 - Methane 14 = N2 - Nitrogen 3 = C2H2 - Ethyne 15 = Ne - Neon 4 = C2H4 - Ethelyne 16 = NH3 - Ammonia 5 = C2H6 - Ethane 17 = NO - Nitrogen Oxide 6 = C3H6 - Propylene 18 = N2O - Nitrous Oxide 7 = C3H8 - Propane 19 = O2 - Oxygen 8 = C4H10 - Butane 20 = XE - Xenon 9 = CO - Carbon Monoxide 21 = UserGas1 10 = CO2 - Carbon Dioxide 22 = UserGas2 11 = H2 - Hydrogen 23 = UserGas3

QMA401 User’s Manual

84 97450 Issue 2, March 2018

QMA401 User’s Manual

Appendix D

APPENDIX D

Quality, Recycling

& Warranty

Information

Michell Instruments 85

APPENDIX D

QMA401 User’s Manual

Appendix D Quality, Recycling, Compliance & Warranty Information

Michell Instruments is dedicated to complying to all relevant legislation and directives. Full information can be found on our website at:

www.michell.com/compliance

This page contains information on the following directives:

• ATEX Directive

• Calibration Facilities

• Conflict Minerals

• FCC Statement

• Manufacturing Quality

• Modern Slavery Statement

• Pressure Equipment Directive

• REACH

• RoHS2

• WEEE2

• Recycling Policy

• Warranty and Returns

This information is also available in pdf format.

86 97450 Issue 2, March 2018

QMA401 User’s Manual

Appendix E

APPENDIX E

Return Document &

Decontamination Declaration

Michell Instruments 87

APPENDIX E

QMA401 User’s Manual

Appendix E Return Document & Decontamination Declaration

'HFRQWDPLQDWLRQ&HUWL¿FDWH

IMPORTANT NOTE: Please complete this form prior to this instrument, or any components, leaving your site and being returned to us, or, where applicable, prior to any work being carried out by a Michell engineer at your site.

Instrument Serial Number Warranty Repair? YES NO Original PO # Company Name Contact Name

Address

Telephone # E-mail address Reason for Return /Description of Fault:

Has this equipment been exposed (internally or externally) to any of the following? Please circle (YES/NO) as applicable and provide details below

Biohazards YES NO Biological agents YES NO Hazardous chemicals YES NO Radioactive substances YES NO Other hazards YES NO Please provide details of any hazardous materials used with this equipment as indicated above (use continuation sheet

if necessary)

Your method of cleaning/decontamination

Has the equipment been cleaned and decontaminated? YES NOT NECESSARY Michell Instruments will not accept instruments that have been exposed to toxins, radio-activity or bio-hazardous

PDWHULDOV)RUPRVWDSSOLFDWLRQVLQYROYLQJVROYHQWVDFLGLFEDVLFÀDPPDEOHRUWR[LFJDVHVD VLPSOHSXUJHZLWKGU\ JDVGHZSRLQW&RYHUKRXUVVKRXOGEHVXI¿FLHQWWRGHFRQWDPLQDWHWKHXQLWSULRUWRUHWXUQ

Work will not be carried out on any unit that does not have a completed decontamination declaration.

Decontamination Declaration

I declare that the information above is true and complete to the best of my knowledge, and it is safe for Michell personnel to service or repair the returned instrument.

Name (Print) Position

Signature Date

F0121, Issue 2, December 2011

88 97450 Issue 2, March 2018

NOTES

QMA401 User’s Manual

90 97450 Issue 2, March 2018

Michell Instruments QMA401 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual