Michell Instruments DryCheck Operating Manual
Easidew DryCheck
OnLine Dew-Point Hygrometer
User’s Manual
97108 Issue 13
July 2017
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.
Instrument
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Instrument
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Instrument
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Easidew DryCheck
For Michell Instruments' contact information please go to
www.michell.com
© 2017 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.
Easidew DryCheck User’s Manual
Contents
Safety ................................................................................................................................vi
Electrical Safety ...........................................................................................................vi
Pressure Safety ............................................................................................................vi
Toxic Materials .............................................................................................................vi
Repair and Maintenance ...............................................................................................vi
Calibration ...................................................................................................................vi
Safety Conformity ........................................................................................................vi
Abbreviations .....................................................................................................................vii
Warnings ...........................................................................................................................vii
1 INTRODUCTION ............................................................................................VIII
1.1 General ............................................................................................................ viii
1.2 Features .......................................................................................................... viii
2 INSTALLATION ..................................................................................................1
2.1 Unpacking the Instrument ................................................................................... 1
2.2 DryCheck System Configuration ........................................................................... 2
2.3 Monitor .............................................................................................................. 2
2.4 Monitor Panel Layout .......................................................................................... 3
2.5 Function Keys ..................................................................................................... 5
2.6 Mounting ........................................................................................................... 5
2.7 Power Supply .................................................................................................... 5
2.8 Signal Output Connections ................................................................................. 6
3 OPERATION ......................................................................................................8
3.1 General Operational Information ......................................................................... 8
3.2 Preparation For Operation ................................................................................... 9
3.2.1 First Time Operation ...................................................................................... 9
3.3 System Alarms ................................................................................................. 10
3.3.1 Alarm Switching Logic (Default) ................................................................... 10
3.3.2 Reversal of Alarm Switching Logic ................................................................ 10
3.3.3 Alarm Level Set-Up ..................................................................................... 12
3.3.4 Re-Transmitted Output Current Range Set-Up ............................................... 13
3.4 Operating Temperature / ppmV Range ............................................................... 14
3.4.1 Temperature Range Default ......................................................................... 14
3.4.2 Span and Unit Settings ............................................................................... 15
3.4.3 Alarm Set-Point Limit Configuration .............................................................. 16
3.4.4 Scale Units to ppmV Set-Up .......................................................................... 17
3.4.5 Monitor Limits When Unit Scaled to ppmV .................................................... 18
3.5 Digital Communication Parameters Set-Up .......................................................... 19
3.6 Monitor – Reading the Displayed Value Using Modbus RTU Over RS232 ................ 21
4 GOOD MEASUREMENT PRACTICE .....................................................................22
5 MAINTENANCE ................................................................................................23
5.1 General Maintenance Guidelines ........................................................................ 23
5.2 Calibration ....................................................................................................... 23
5.3 Transmitter Maintenance ................................................................................... 23
5.4 Inspection/Cleaning .......................................................................................... 24
5.5 Fault Conditions ............................................................................................... 25
iv 97108 Issue 13, July 2017
Easidew DryCheck User’s Manual
Figures
Figure 1 Easidew DryCheck ................................................................................... viii
Figure 2 Unpacking Method ......................................................................................1
Figure 3 Gas Flow Diagram ......................................................................................2
Figure 4 Monitor Panel Layout ..................................................................................3
Figure 5 Alarm and Communications .........................................................................6
Figure 6 Monitor Rear Panel Connections ..................................................................7
Figure 7 Typical Display ...........................................................................................9
Figure 8 Change Alarm Switching Logic ...................................................................11
Figure 9 Set-up Alarm Levels ..................................................................................12
Figure 10 Configure Analog Output ...........................................................................13
Figure 11 Span and Unit Settings .............................................................................15
Figure 12 Set-up Alarm Set-Point Limits ....................................................................16
Figure 13 Set-up Monitor (to read ppm
Figure 14 Set-up Data Communications Parameters ...................................................20
Figure 15 Sensor Removal .......................................................................................23
Figure 16 Inspection/Cleaning ..................................................................................24
Figure 17 System Drawings ......................................................................................29
) ...................................................................18
V
Tables
Table 1 Monitor Front Panel Controls and Indicators ..................................................4
Table 2 Function Keys ..............................................................................................5
Table 3 Summary of Electrical Connections ...............................................................7
Appendices
Appendix A Technical Specifications .............................................................................. 27
Appendix B System Drawing ........................................................................................ 29
Appendix C Quality, Recycling & Warranty Information ................................................... 31
Appendix D Return Document & Decontamination Declaration ........................................ 33
Appendix E EU Declaration of Conformity...................................................................... 35
Michell Instruments v
Easidew DryCheck 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
competent personnel using good engineering practice for all procedures in this manual.
Electrical Safety
The instrument is designed to be completely safe when used with options and accessories supplied
by the manufacturer for use with the instrument.
Pressure Safety
DO NOT permit pressures greater than the safe working pressure to be applied to the instrument.
The specifi ed safe working pressure is 10 barg (145 psig).
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.
Repair and Maintenance
The instrument must be maintained either by the manufacturer or an accredited service agent. Refer
to www.michell.com for details of Michell Instruments’ worldwide offi ces’ contact information.
Calibration
The recommended calibration interval for this instrument is 12 months unless it is to be used in a
mission-critical application or in a dirty or contaminated environment in which case the calibration
interval should be reduced accordingly. The instrument should be returned to the manufacturer,
Michell Instruments Ltd., or one of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives. Further
details of applied standards may be found in the product specifi cation.
vi 97108 Issue 13, July 2017
Easidew DryCheck User’s Manual
Abbreviations
The following abbreviations are used in this manual:
AC alternating current
barg pressure unit (=100 kP or 0.987 atm)
°C degrees Celsius
°F degrees Fahrenheit
dp dew point
Hz Hertz
mA milliampere
Nl/min normal liters per minute
psig pound(s) per square inch (gauge)
V volts
VA volt-ampere
Warnings
The following general warnings listed below are applicable to this instrument. They are
repeated in the text in the appropriate locations.
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.
Michell Instruments vii
APPENDIX D
1 INTRODUCTION
1.1 General
The Easidew DryCheck is an instrument designed for continuous, online measurement
of moisture content in compressed air and other gases over an operating range of over
either -100 to +20°Cdp (-148 to -4°Fdp) / -60 to +60°Cdp (-76 to 140°Fdp) / -50 to
+50°Cdp (-58 to 122°Fdp). The Easidew DryCheck is protected within an IP65-rated,
wall-mounted enclosure with a hinged lid. The lid allows access to a panel-mounted,
process indicator with a °C dew-point display.
Easidew DryCheck User’s Manual
Figure 1
Easidew DryCheck
1.2 Features
Integrated instrument and sampling system
• Simple installation
• Wide measurement range
• Dew point or moisture content
• Analog output, display and alarm
• IP65 (NEMA 4x) enclosure
viii 97108 Issue 13, July 2017
Easidew DryCheck User’s Manual
2 INSTALLATION
2.1 Unpacking the Instrument
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel.
The Easidew DryCheck instrument and its accessories are packed into a box and the
method of unpacking is shown as follows:
1
INTRODUCTION
4
2
3
Figure 2
Open the box and unpack carefully (see
Unpacking Method
Figure 2)
:
1. Remove the accessories box (4).
2. Lift out the instrument (2) together with its end packing pieces (1) and
(3).
3. Remove the end packing pieces and set the instrument down at the site
of installation.
Save all the packing materials for the purpose of returning the instrument for
re-calibration or any warranty claims.
The accessories box (4) should contain the following items
:
• Traceable calibration certificate
• User manual
• Country specific power cable
On delivery please check that all the standard components shown above are present in
the packing box. Immediately report any shortages to Michell Instruments.
Michell Instruments 1
INSTALLATION
2.2 DryCheck System Configuration
The DryCheck sampling system includes a 0.3 m particulate filter element, a monolithic
sampling block to house the transmitter, and a valve and flowmeter for setting the sample
flow. The filter element is easily replaceable to ensure that the sensor is protected. All
components are rated to 1 MPa (10 barg) and the DryCheck can be configured for
measurement of dew point at either system or atmospheric pressure.
All components are housed in a rugged IP65 (NEMA 4x) rated polycarbonate case. This
can easily be wall mounted at a convenient point close to the gas sample.
A clear cover protects the display and the sample flowmeter. Gas connection (gas in and
gas out) is provided using quick connect push fittings suitable for use with 6mm (¼”)
OD Teflon tubing. Mains power input and connection to the 4-20 mA analog output and
the two user programmable voltage free relay contacts are all easily accessible behind
the lower panel.
Easidew DryCheck User’s Manual
NOTE: The DryCheck is designed to measure dew point at standard instrument
air pressure or 7 barg.
A barometric version is available on request, please contact Michell Instruments (see
www.michell.com for contact details).
2.3 Monitor
The controls and indicators associated with the Easidew DryCheck are located on the
front panel of the monitor.
Easidew
Online
Easidew
TX Sensor
Sample
Block
Gas Inlet
Figure 3
Needle
Valve
Flowmeter
Gas Flow Diagram
Gas Outlet
Connections to the monitor and the external power supply are made to the rear panel
of the monitor and are replicated on two terminal blocks.
Figure 4
shows the layout of these controls and Tables 1 and 2 describe their respective
operational functions.
Dew-point temperature units are displayed by one of the two LEDs located to the left
of the display. On delivery, °Cdp is set-up as standard. If required, the units can be
changed to °F. The method of configuring the unit for °F is described in Section 3.4.
Optionally, the instrument can be set-up to read dew point in parts per million (ppm
range 0 to 3000 ppm
. This option requires the transmitter to be set-up for ppmV either
V
V
at the time of ordering or subsequently via Michell application software. NOTE: No
specific ppm
LED indicator is provided on the monitor; ppmV is selected if
V
neither the °Cdp nor the °Fdp temperature indicators are illuminated.
2 97108 Issue 13, July 2017
),
Easidew DryCheck User’s Manual
Two temperature alarm indications are provided by two LEDs located on the right hand
side of the display. These are marked ALr1 (low) and ALr2 (high). Access to the alarm
relay contacts is provided on the rear panel. The connection for the ALr2 contact is
shown in Section 2.8.
NOTE: Every monitor is factory fitted with 2 alarm relays as standard. On the
DryCheck product only 1 relay (
2.4 Monitor Panel Layout
Easidew Hygrometer
INSTALLATION
ALr2) is brought to the terminal strip.
6
Figure 4
Monitor Panel Layout
Michell Instruments 3
INSTALLATION
Item Description
°Fdp
Easidew DryCheck User’s Manual
1
2
3
4
When illuminated, this LED indicates that the displayed dew-point reading is in degrees
Fahrenheit.
NOTE: If neither the °Fdp or °Cdp LED is lit, ppm
°Cdp
When illuminated, this LED indicates that the displayed dew-point reading is in degrees
Celsius.
NOTE: if neither the °Cdp nor °Fdp LED is lit, ppm
Main dew-point temperature display
Flashes to alternately indicate ErrL (error low) and temperature reading for low
temperatures under-range (lower than -100°Cdp (-148°Fdp) or -129.9°Cdp (199.9°Fdp)
for an open loop condition).
Flashes to alternately indicate
temperature over-range.
ALr1 Output
Only available directly from the back of the Monitor panel.
ALr2
ErrH (error high) and temperature reading for high
is selected.
V
is selected.
V
When illuminated this LED indicates that the dew-point temperature programmed for
Alarm 2 has exceeded the programmed threshold. Under these conditions the alarm
relay changeover contacts associated with this alarm will change state and will remain in
this state until the temperature moves back to within the programmed operational limit.
5
Alarm 2 is usually allocated to the High Alarm setting.
These changeover relay contacts are rated at 240 V, 3 A and are connected as shown
in Section 2.8.
Section 3.4.3 details the setting up of
6
P
Table 1 Monitor Front Panel Controls and Indicators
SET
ALr2 trip points.
The four function keys are used for setting up the
monitor.
Table 2 describes the operation of the keys.
4 97108 Issue 13, July 2017
Easidew DryCheck User’s Manual
2.5 Function Keys
INSTALLATION
The function key panel is shown in
Table 2 describes the operation of the keys.
Item Description
Figure 4
P (Program) key
P
This key is used to access the programming menus and to select submenus within the list.
Left arrow (decrement) key
This key is used to access sub-menus and, within individual sub-menus,
to decrease the numeric value of the selected parameter.
Right arrow (increment) key
This key is used to access sub-menus and, within individual sub-menus,
to increase the numeric value of the selected parameter.
SET key
SET
Depending upon the context, this key is used to access the set value
of the selected process fi eld and as an Accept key for new parameter
values.
.
2.6 Mounting
The instrument is designed for wall or panel-mounting and has 3 fixing points. Mounting
fasteners are not supplied. See the System Drawing in Appendix B for wall-mount fixing
points.
2.7 Power Supply
A single-phase mains power supply of 100 to 240 V (-15% / +10%), 50/60 Hz, 6 VA is
required to power the Easidew DryCheck.
Loosen the 2 screws and remove the access cover at the lower front of the instrument
(Figure 5)
passed.
The power supply cable should then be connected to the terminal strip which is mounted
on the right hand side.
. A cable gland is provided, through which the power supply cable should be
Table 2 Function Keys
Terminals are marked:
7 8 9 101112
Earth Not Used Neutral Not used Live Not used
Michell Instruments 5
Loading...