Michell Instruments QMA401 Operating Manual

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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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

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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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QMA401 User’s Manual

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

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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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QMA401 User’s Manual

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

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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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