Michell Instruments XTC601 Operating Manual
XTC601
Thermal Conductivity Analyzer
User’s Manual
97400 Issue 2
July 2015
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XTC601
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© 2015 Michell Instruments
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.
XTC601 User’s Manual
Contents
Safety ...............................................................................................................................vii
Electrical Safety ..........................................................................................................vii
Hazardous Area Safety .................................................................................................ix
Pressure Safety ............................................................................................................ x
Temperature Safety ...................................................................................................... x
Toxic Materials ............................................................................................................. x
Repair and Maintenance ............................................................................................... x
Calibration ................................................................................................................... x
Safety Conformity ........................................................................................................ x
Abbreviations ......................................................................................................................xi
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 2
1.2 Applications ....................................................................................................... 3
1.3 O-Ring Selection ................................................................................................. 3
2 OPERATION ......................................................................................................4
2.1 Preparation ........................................................................................................ 4
2.2 Powering up the Analyzer .................................................................................... 5
2.3 User Interface .................................................................................................... 6
2.3.1 Interface Controls ......................................................................................... 6
2.3.2 ‘ESC’ Button .................................................................................................. 7
2.3.3 ‘Up/Down Arrow’ Buttons ............................................................................... 7
2.3.4 ‘ENTER’ Button ............................................................................................. 7
2.4 Menu Structure .................................................................................................. 8
2.4.1 Menu Map .................................................................................................... 9
2.5 Front Pages (No Passcode Required) .................................................................... 9
2.5.1 Main Page .................................................................................................. 10
2.5.2 Chart Page ................................................................................................ 11
2.5.3 Secondary Parameters Page ......................................................................... 12
2.5.4 Target Gas Min/Max Page ........................................................................... 12
2.5.5 Alarms Log Pages ....................................................................................... 13
2.6 Info Page ........................................................................................................ 13
2.7 User Set-Up Variables (Passcode Required) ........................................................ 14
2.7.1 Settings Page .............................................................................................. 15
2.7.2 Human Machine Interface (HMI) Page .......................................................... 16
2.7.3 Reset Page ................................................................................................. 16
2.7.4 Outputs Page .............................................................................................. 17
2.7.5 External Compensation Page ........................................................................ 18
2.7.6 External Sensor Page .................................................................................. 19
2.7.7 Clock Page .................................................................................................. 20
2.7.8 Field Cal Page ............................................................................................. 20
2.7.9 Status LED or Light Guide ............................................................................ 21
3 CALIBRATION ..................................................................................................22
3.1 1 Point Calibration ............................................................................................ 23
3.2 2 Point Calibration ........................................................................................... 24
3.3 Field Calibration Reset ...................................................................................... 25
4 INSTALLATION ................................................................................................26
4.1 Unpacking ........................................................................................................ 27
4.2 System Components ......................................................................................... 27
4.2.1 Casing ........................................................................................................ 28
4.3 Set-Up ............................................................................................................. 28
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XTC601 User’s Manual
4.4 Mechanical Installation ...................................................................................... 29
4.4.1 Gas Connection Tape ................................................................................... 30
4.4.2 Sample Gas Requirements ........................................................................... 30
4.4.3 Calibration Gases ........................................................................................ 30
4.5 Electrical Installation ......................................................................................... 31
4.5.1 Power Supply and Input/Output Signal ......................................................... 31
4.5.2 Power Supply (PL9 - Green) ........................................................................ 31
4.5.3 Analog Output ............................................................................................ 31
4.5.4 Serial Output .............................................................................................. 32
4.5.5 Analog (4-20 mA) Outputs and Communications (PL5 - Green) ....................... 32
4.5.6 Alarm Relay Contacts (PL1- Black) ................................................................ 32
4.5.7 Analog (4-20 mA) Inputs and Sensor Excitation Voltage (PL4 - Green) ............ 33
4.5.8 Light Guide ................................................................................................. 33
Figures
Figure 1 XTC601 Thermal Conductivity Analyzer Versions ..........................................1
Figure 2 Initializing Screen .......................................................................................5
Figure 3 Main Page ..................................................................................................5
Figure 5 XTC601 Application Software .......................................................................6
Figure 4 User Interface ............................................................................................6
Figure 6 ESC Button ................................................................................................7
Figure 7 Up/Down Arrow Buttons .............................................................................7
Figure 8 ENTER Button ............................................................................................7
Figure 9 Menu Map ..................................................................................................9
Figure 10 1 Point Calibration Page ............................................................................23
Figure 11 2 Point Calibration Page ............................................................................24
Figure 12 XTC601 Showing Major Components ..........................................................27
Figure 13 XTC601 Lid Removal .................................................................................28
Figure 14 XTC601 Gas Connections and Cable Entries ................................................29
Figure 15 Terminal Block Locations ...........................................................................31
Figure 16 2 Port Dimensional Drawings .....................................................................38
Figure 17 4 Port Dimensional Drawings .....................................................................39
Michell Instruments v
XTC601 User’s Manual
Appendices
Appendix A Technical Specifications .............................................................................35
Appendix B Dimensional Drawings...............................................................................38
Appendix C Relative Thermal Conductivity Table ...........................................................41
Appendix D Modbus Register Map ...............................................................................43
Appendix E Hazardous Area Certification .....................................................................50
E.1 Product Standards ...................................................................... 50
E.2 Product Standards ...................................................................... 50
E.3 Global Certicates/Approvals ....................................................... 50
E.4 Special Conditions....................................................................... 50
E.5 Maintenance and Installation .......................................................51
Appendix F EU Declarations ........................................................................................53
F.1 EU Declaration of Conformity - GP Version .................................... 53
F.2 EU Declaration of Conformity - EX Version .................................... 54
Appendix G Quality, Recycling & Warranty Information ..................................................56
G.1 Pressure Equipment Directive (PED) 97/23/EC .............................. 56
G.2 Recycling Policy ......................................................................... 56
G.3 WEEE Compliance ....................................................................... 56
G.4 RoHS2 Compliance .....................................................................57
G.5 Warranty .................................................................................... 57
G.6 REACH Compliance ..................................................................... 58
G.7 Return Policy .............................................................................. 58
G.8 Calibration Facilities ....................................................................59
G.9 Manufacturing Quality ................................................................. 59
G.10 FCC (EMC Requirements for North America) ................................. 59
Appendix H Analyzer Return Document & Decontamination Declaration .........................61
vi 97400 Issue 2, July 2015
XTC601 User’s Manual
Safety
The manufacturer has designed this equipment to be safe when operated using the procedures
detailed in this manual. The user must not use this equipment for any other purpose than that
stated. Do not apply values greater than the maximum value stated.
This manual contains operating and safety instructions, which must be followed to ensure the safe
operation and to maintain the equipment in a safe condition. The safety instructions are either
warnings or cautions issued to protect the user and the equipment from injury or damage. Use
qualified personnel and good engineering practice for all procedures in this manual.
Where this 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.
Electrical Safety
WARNING:
During the installation of this product ensure that all applicable
national and local electrical safety regulations are observed.
WARNING:
Isolate the power prior to installation.
WARNING:
Always ensure that power is switched off prior to accessing the
product for any purpose other than normal operation or prior to
disconnecting any cables.
In compliance with IEC 61010 Electrical Safety Standard the following applies to this product:
Equipment ratings:
This equipment must be supplied with a voltage of 24 V DC, 1.5 A (36 W).
The power is connected via PL9 on the mother board (see Section 4.5).
All input and output connectors are 2-part pcb mounted type.
The detachable, screw terminal half of each connector is designed to accept 24 -12 AWG stranded
or solid conductors.
Michell Instruments vii
XTC601 User’s Manual
Ensure suitably rated power supply cables and glands are used to ensure that electrical safety is
maintained. Connect to the POWER IN each of the Live (L), Neutral (N) and Earth [Ground] (E)
conductors to the similarly marked terminals (L, N, E). Ensure the power supply can deliver sufficient
power consumption requirement.
Ensure any power supply terminals and voltages are suitably separated from the other I/O
requirements of this product.
Before applying power, perform a continuity test to ensure that the power supply cable and product
are effectively connected to the protective Earth.
The product enclosure is supplied with an external Earth stud at the lower right hand side. At
installation, connect this Earth stud to plant Earth by a minimum 4mm2 earthing bonding.
Fuse - A replacement fuse can be obtained by contacting Michell Instruments' technical support.
Michell order number - XTP601-26149.
This product is designed to operate, as a minimum, between a temperature range of -5 to +40°C (+23
to +104°F), in maximum 80% relative humidity for temperatures up to +31°C (+87°F) decreasing
linearly to 50% RH at 50°C (122°F). Supply voltages of ±10% and transient over voltages up
to Overvoltage Category II. Pollution Degree 2. Altitudes up to 2,000 mtrs. Outdoor mounting is
permitted using suitably rated glands equivalent to NEMA 4 / IP66. See Technical Specifications
(Appendix A) in this manual for full operating parameters. Do not remove or exchange any of the
cables or electrical components supplied with this product. To do so will invalidate all warranties.
There are no additional or special electrical safety requirements other than those referred to in this
manual.
Location and mounting arrangements. Refer to the relevant sections of this manual for the location
and mounting details.
Installation of this equipment should include the provision of a suitable and locally positioned power
isolation switch or circuit breaker.
Ensure this equipment and all power isolation devices are installed in a location and position that
allows safe and easy access to their operation and is adequate to rigidly support the equipment.
Do not install this equipment in a location that would expose it to impact or high levels of vibration.
Operation of this equipment, other than in a manner as specified by the manufacturer, may impair
the safety protections provided.
The safe installation of this equipment and any system incorporating this equipment is the
responsibility of the installer. Ensure local regulations and requirements are referred to prior to any
installation commencing.
viii 97400 Issue 2, July 2015
XTC601 User’s Manual
Hazardous Area Safety
Appendix E of this manual refers to the EX version and the Hazardous Area Certification of this
product.
This product is fitted with a marking label that contains Hazardous Area information pertinent to the
suitable location and installation.
During all installation and operation activities local regulations and permitted working routines must
be observed. Installation should only be performed by competent personnel and in accordance with
IEC/En 60079-14:2008 or local equivalent.
Repair and servicing of this equipment must only be carried out by the manufacturer.
WARNING:
This product is certied safe for use in a Zone 1 and Zone 2 area
only. This product must not be installed or used within a Zone 0
area.
WARNING:
This product must not be operated within an explosive
atmosphere greater than 1.1 bar absolute.
WARNING:
This product must not be operated with oxygen above 21% in a
hazardous area.
WARNING:
This product must not be operated outside of
the temperature range of -20 to +55°C (-4 to +131°F).
Michell Instruments ix
XTC601 User’s Manual
Pressure Safety
WARNING:
This product is used in conjunction with pressurized gases.
Observe pressurized gas handling precautions.
WARNING:
Pressurized gas is dangerous.
Pressurized gas should only handled by suitably trained
personnel.
The XTC601 measurement chamber requires pressurized gas to be connected to it. Observe
pressurized gas handling regulations. Suitably trained personnel only should carry out tasks that
include the use of pressurized gas mediums.
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specified safe working pressure for this instrument is 3 barg (43 psig) max.
Temperature Safety
During operation some internal parts of the instrument may be at high temperature.
Toxic Materials
The use of hazardous materials in the construction of this instrument has been minimized. During
normal operation it is not possible for the user to come into contact with any hazardous substance
which might be employed in the construction of the instrument. Care should, however, be exercised
during maintenance and the disposal of certain parts.
Long exposure to, or breathing of the calibration gases, may be dangerous.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. For
Michell Instruments’ worldwide offices contact information go to www.michell.com.
Calibration
The recommended calibration interval for the analyzer is 1 to 3 months.
Safety Conformity
This product carries the CE mark and meets the requirements of relevant European safety directives.
x 97400 Issue 2, July 2015
XTC601 User’s Manual
Abbreviations
The following abbreviations are used in this manual:
A Ampere
AC alternating current
bara pressure in bar (absolute)
barg pressure in bar (gauge)
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
kg kilogram
kPa Kilopascal
lb pound
max maximum
mA milliampere
ml/min milliliters per minute
mm millimeters
μm micrometer
ppm parts per million
psig pounds per square inch
scfh standard cubic feet per hour
V Volt
" inches
Ω ohm
% percentage
Michell Instruments xi
XTC601 User’s Manual
1 INTRODUCTION
This manual will show how to measure binary or pseudo-binary gases easily using the
XTC601 Thermal Conductivity Analyzer.
The following sections contain information about:
• Analyzer components
• Operating instructions
• Calibration and maintenance of the analyzer
• Installation
Please read this manual carefully and pay special attention to the safety warnings and
notifications.
NOTE: Warnings and important notifications are marked with bold text.
The 4 versions of the XTC601 available (with two or four gas ports) are shown below:
INTRODUCTION
GP1 or EX1 Version GP3 or EX3 Version
Analyzer with touch screen Transmitter
(capacitive buttons)
Back. Gas: CH4
%
55.1 C02
Cell T Not Stable
Figure 1
XTC601 Thermal Conductivity Analyzer Versions
The XTC601 Thermal Conductivity Analyzer is based on Michell Instruments’ advanced
proprietary technology. It measures the percentage levels of a Target Gas in a selection
of background gases, including nitrogen, hydrogen, carbon dioxide, methane and
biogas. The sensor is housed in a weather-proof (GP version) or explosion-proof (EX
version) casing - both IP66 & NEMA 4 rated. It is suitable for a range of applications in
safe or hazardous areas.
Michell Instruments 1
INTRODUCTION
1.1 Features
• There are 2 casing versions of the XTC601 available, all of which can be
configured with 2 port (sealed reference) or 4 port (flowing reference):
• The XTC601 provides 2 off 4-20 mA analog output signals that are
proportional to the Target Gas concentration. The primary 4-20
mA output is locked on the calibrated range of the instrument. The
secondary output is user-selectable within the calibrated range.
• Modbus RTU over RS485 protocol serial communications are provided
as standard.
• Accuracy of 2% for standard ranges.
• Zero and span stability of 0.5% of span per month.
XTC601 User’s Manual
Analyzer with display and touch screen (capacitive) buttons
Transmitter
• The sensor used in the XTC601 Thermal Conductivity Analyzer has no
moving parts. This reduces sensitivity to vibration and movement.
• The robust and weather-proof enclosure (IP66 rated) allows the XTC601
to be installed on-site, at the point of measurement. The EX version
is housed in an explosion-proof casing, and is certified to II 2GD Ex d
IIB+H2 T3 Gb, Ex tb IIIC T137°C Db IP66 T amb -40°C to +55°C.
• All of the analyzer functions can be accessed via the touch screen
(capacitive) buttons, or via the Application Software.
• Low cost of ownership due to minimal maintenance. When required,
the casing unscrews to allow for easy access to the sensor, enabling
maintenance to be carried out quickly and easily.
• The XTC601 is certified to ATEX, IECEX, cCSAus & TC TR Ex for use in
hazardous areas.
• 2 x single pole change-over relay alarms for Target Gas concentration,
supplied as standard.
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XTC601 User’s Manual
1.2 Applications
The XTC601 binary gas analyzer is designed for use in process environments.
A sample system may be required to ensure that a clean, dry gas with no particles
or oil-mist is delivered to the XTC601. This will ensure the sensor is not damaged or
contaminated by the process. Michell Instruments is able to supply a quotation for such
a system.
Examples of applications include:
• H2 generator cooling systems (Power Generation)
INTRODUCTION
• H
• CO
• CO
in heat treatment furnaces (Metals)
2
in fermentation process (Food)
2
in biogas
2
• Ethylene Oxide sterilization process (Food)
• H
• H
in blast furnace top gas (Steel)
2
in hydrocarbons (Petrochemical)
2
• He recovery (Industrial Gas)
• N
• SF
in CO2 (Industrial Gas)
2
in switchgear
6
1.3 O-Ring Selection
The XTC601 has only one elastomeric seal in the gas path. There are 3 types of O-rings
available to offer greater flexibility with material compatibility. The Viton O-ring is fitted
as standard. The EKRAZ O-ring is available for solvent resistance. For extremely low
temperatures there is a closed cell Silicone O-ring.
To comply with Hazardous Area certification, the material used in the EX1 & EX3 versions
is dependent on the lowest ambient temperature of the area the units are to be installed
in:
Ambient operating range:
-40°C to +55°C (-40°F to +131°F) (for Silicone O-ring)
-15°C to +55°C (+5°F to +131°F) (for Viton O-ring) - Standard
-10°C to +55°C (+14°F to +131°F) (for Ekraz O-ring)
Michell Instruments 3
OPERATION
2 OPERATION
This analyzer has been manufactured within our quality procedures and is configured
according to the purchase order. When it is installed and used as per the manufacturer’s
guidelines, it will operate within the stated specification.
Before starting operation it is recommended that the user becomes familiar with this
manual in which all the equipment controls, indicators, the elements of the display and
the overall menu structure are described.
XTC601 User’s Manual
The XTC601 is not certied for use with enriched Oxygen
samples in a hazardous area.
2.1 Preparation
Zero and Span gas cylinders with correct regulation and flow control should be in place
before installing and powering up the analyzer. Commissioning should include a check
with both gases and, if necessary, a field calibration performed.
All analyzers will be calibrated with an inlet pressure of 1 barg (14 psig) with an
atmospheric vent and flow rate of 300 ml/min (0.63 scfh). The calibration gas applied
to the analyzer should be at the same pressure and flow rate as the process gas being
sampled.
• Sample Inlet Pressure: 0 to 3 barg (0 to 43 psig) with atmospheric vent
Before applying power and beginning the ow of gas,
please ensure that the system has been properly installed
following the instructions in Section 4.
Check that the wiring has been completed correctly.
• Sample Flow Rate: 100 to 600 ml/min (0.2 to 1.27 scfh)
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XTC601 User’s Manual
2.2 Powering up the Analyzer
After all the preparation work has been done and the
installation and wiring have been checked, turn on the
analyzer and wait for at least 45 minutes (or until
T Not Stable
analyzer to reach its operating temperature of +50°C
(122°F) and protect it from any condensation forming in
There is no power switch on the XTC601 Thermal Conductivity Analyzer. It is turned on
automatically once a 24 V DC power source is applied. After the analyzer is powered
up, the display will be illuminated. The analyzer takes up to 5 seconds to initialize, and
during this period will display the product type and firmware version number.
OPERATION
Cell
message disappears). This will allow the
the sensor.
Background
Gas
CO2
Concentration
Status Bar
XTC601
Ver. *.**
Figure 2
Back. Gas: CH4
Initializing Screen
55.1 C02
Cell T Not Stable
Figure 3
%
Main Page
Once initialized, the analyzer will show the Main Page which displays the Target Gas
concentration and the background gas that the unit has been calibrated in.
During warm-up (less than 30 minutes) a heating symbol will flash in the top right
hand corner of the page. This symbol will remain for a minimum of 15 minutes until the
temperature has stabilized. The analyzer will be ready for use within 45 minutes from
power-up.
Michell Instruments 5
OPERATION
2.3 User Interface
2.3.1 Interface Controls
XTC601-EX1
Thermal Conductivity Analyzer
XTC601 User’s Manual
Backlit LCD
ESC
ESC
Button
Up/Down
Arrow
Buttons
Figure 4
ENTER
ENTER
Button
User Interface
Blue LEDs
The diagram above illustrates the user interface, which consists of a backlit Liquid
Crystal Display and 4 touch-sensitive pads that facilitate user interaction through the
glass of the enclosure.
All versions have Application Software to monitor or adjust parameters.
Figure 5
XTC601 Application Software
6 97400 Issue 2, July 2015
XTC601 User’s Manual
2.3.2 ‘ESC’ Button
OPERATION
ESC
The ESC button is used to exit the current menu and to return to the previous menu.
From the Main Page, pressing
2.3.3 ‘Up/Down Arrow’ Buttons
Figure 7
The Up () and Down () buttons are used to change pages, scroll through lists and
adjust values.
Figure 6
ESC Button
ESC will access the Info Page.
Up/Down Arrow Buttons
In the Reset and Field Calibration Menus, pressing the
confirm a selection.
2.3.4 ‘ENTER’ Button
The ENTER button is used to select or de-select the highlighted item in a menu and to
confirm a value.
From the Main Page, pressing
Up () button 3 times will
ENTER
Figure 8
ENTER Button
ENTER will access the Passcode Page.
Michell Instruments 7
OPERATION
2.4 Menu Structure
The EX1 and GP1 versions of the XTC601 have front pages that do not require a
passcode but allow the user to scroll through and view Target Gas concentration, recent
trend, internal parameters, minimum & maximum concentration and alarm history.
In order to change any settings on the User Menu pages, the user must enter a passcode.
There is also a separate passcode for service engineers to allow factory setting changes.
XTC601 User’s Manual
To access the User Menu press the
passcode prompt. Use the
each value.
The User Passcode is:
From the Main Page the user can press the ESC button to view the Info Page. This page
shows the firmware version, hours used, last calibration date, calibration pressure and
the received Modbus code.
The user will be able to set up and access all functions of the transmitter versions via
the Application Software supplied. The passcode is the same as with the EX1 and GP1
versions (
The passcode is stored for one minute to allow access back into the User Menu, if
necessary.
1919). The Application Software will be supplied on a CD with the unit.
Up () and Down () buttons and press ENTER after
1919
ENTER button from the Main Page to call up a
8 97400 Issue 2, July 2015
XTC601 User’s Manual
2.4.1 Menu Map
ENTER
FIELD CAL
EXT COMP
LIMIT 0-100%
MODBUS ID
CONTRAST
BRIGHTNESS
TEMPR UNIT
EXT PRESS UNIT
CHART INTVAL
DATE
MIN/MAX
FIELD CAL
LO ALARM SP
HI ALARM SP
CH2 OUT ZERO
CH2 OUT SPAN
COMP 20%
COMP 40%
COMP 60%
COMP 80%
COMP 100%
EXT.SENS PV
EXT.SENS MIN
EXT.SENS MAX
UNIT
HOURS
MINS
DAY
MONTH
YEAR
LIVE CLOCK
CAL TYPE
REF GAS 1
ACTUAL 1
REF GAS 2
ACTUAL 2
LIVE % TG
SETTINGS
HMI
RESET
OUTPUTS
USER SETUP PAGES
EXT COMP.
EXT SENS.
CLOCK
FIELD CAL
USER MENU
ON/OFF
ON/OFF
ON/OFF
1-128
SETTINGS
O-100%
O-100%
C/F/K
psia, bara, kpa
4-60s
US/Non US
HMI
RESET?
DELETE?ALARM LOGS
DELETE?
RESET
0.00-100.00%
0.00-100.00%
0.00-100.00%
0.00-100.00%
OUTPUTS
0.50-2.00
0.50-2.00
0.50-2.00
0.50-2.00
0.50-2.00
EXT COMP
TEMPR, etc
-50.0
100.0
ºC, etc
EXT SENS
00-23
00-59
1-31
1-12
00-99
**:**:**
CLOCK
1/2 POINT
0.00-100.00
0.00-100.00
0.00-100.00
0.00-100.00
FIELD CAL
Passcode
1919
OPERATION
XTC601
Ver: 1.01
INT. SCREEN
Back. Gas: CH4
55.1 C02
Cell T Not Stable
58
ESC
%
52
t-4
CELL T ºC 50.0
PCB TEMP, ºC 28
COMP I/P OFF
EXT I/P OFF
MINIMUM 0.00 %C02
D 12/01 T 19:29:44
MAXIMUM 0.00 %C02
D 12/01 T 19:29:44
ALARM DATE TIME P1
ALARM DATE TIME P1
LOW 02/01 12:50:40
LOW 02/01 12:50:40
HIGH 02/01 11:10:32
HIGH 02/01 11:10:32
LOW 02/01 11:00:29
LOW 02/01 11:00:29
HIGH 02/01 10:20:00
HIGH 02/01 10:20:00
%
or
or
or
or
FRONT PAGES
ENTER
t
ESC
Firmware Ver
Hours Used
Last Cal Date
ModBus Rx Code
INFO PAGE
Enter PassCode
0 0 0 0
PASSCODE PAGE
1.01
125
04:01:14
---
Figure 9
Menu Map
2.5 Front Pages (No Passcode Required)
The EX1 and GP1 versions of the XTC601 have 5 front pages that the user can display
without the need for a passcode. NOTE: These are for display of information only
and there is no way of adjusting any settings on these pages.
From the Main Page (Target Gas concentration) the rest of the front pages can be
accessed using the
() button the required amount of times or press the
Down () button. To return to the Main Page, either press the Up
ESC button.
Michell Instruments 9
OPERATION
2.5.1 Main Page
Main Page Description
XTC601 User’s Manual
Back. Gas: CH4
%
55.1 C02
Cell T Not Stable
Background Gas
Target Gas
Heating Symbol
Status Bar
Status Message Table
Message
(Trigger Condition)
Displays the background gas the unit was calibrated in
Target Gas reading in %
Display Resolution = 0.1
This flashes until cell temperature is stable at set point ±0.15°C
for minimum of 15 minutes
Flashes any system warnings and error messages (see below)
Out of range
(beyond calibration range, e.g. 0-25%)
Low alarm ON
High alarm ON
Comp i/p signal error
(input < 3.6 mA or > 21 mA)
Ext sens signal error
(input < 3.6 mA or > 21 mA)
Status LED
N/A
ORANGE1 ON (app s/w only)
ORANGE2 ON (app s/w only)
RED FLASH
(priority2)
RED FLASH
(priority2)
Cell T not stable
(not within ±0.15ºC of set point for continuous period
of 15 minutes)
Cell T sensor error
(cell temp measures <-50 or >+80ºC)
Sensor error
(Vcomp <3400 or >7000)
PCB temp too high
(PCB temp > cell temp set point)
10 97400 Issue 2, July 2015
RED ON
(priority1)
RED ON
(priority1)
RED ON
(priority1)
RED ON
(priority1)
XTC601 User’s Manual
2.5.2 Chart Page
• This indicative chart is continuously running at the set Chart Interval (2
to 60 seconds).
• It is auto ranging with an auto range resolution of 1%.
• It is reset if the Chart Interval is changed or the instrument power is
cycled.
25
%
0
t-4
OPERATION
t
• Chart buffer size is 60 values and therefore the chart duration changes
according to interval chosen.
• Chart duration in seconds = (Chart interval * 60).
• Chart data is only stored in volatile memory and therefore is not saved.
Chart interval is saved and available in a Modbus register.
• Chart data is not available via serial comms or in the blind unit as the
Application Software is able to perform more sophisticated charting
functions.
NOTE: This data is not available via the Modbus
Michell Instruments 11
OPERATION
2.5.3 Secondary Parameters Page
CELL T, °C 50.0
PCB TEMP, °C 28
COMP I/P OFF
EXT I/P OFF
Parameter Description
XTC601 User’s Manual
CELL T
PCB TEMP
COMP I/P
Sensor cell temperature display in set unit (°C, °F or Kelvin)
Display Resolution = 0.1
Temperature display of Microcontroller in selected temperature unit
This gives an indication of the internal GUB temperature
Display Resolution = 1 unit
Accuracy = ±2ºC
The value of compensation input (mA i/p channel 1) as a %
(4 mA=0% and 20 mA=100%)
OFF displayed instead of value if external compensation is turned off
Value of the external input in the selected parameter and unit
EXT I/P
2.5.4 Target Gas Min/Max Page
(DEWP, TEMPR, PRESS, OTHER or NONE)
OFF displayed instead of value if external compensation parameter is set
to
NONE
MINIMUM 0.00 %CO2
D12/01 T 19:29:44
MAXIMUM 0.00 %CO2
D12/01 T 19:29:44
This indicates the minimum and maximum Target Gas values measured, along with date/
time of occurrence. The value is reset manually via the Reset Page in the User Menu.
This data is not saved in NV memory and is not available via serial communications or
in the blind unit.
12 97400 Issue 2, July 2015
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