Michell Instruments Easidew DryCheck User manual

Easidew DryCheck
OnLine Dew-Point Hygrometer
User’s Manual
97108 Issue 13
July 2017

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© 2017 Michell Instruments
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Easidew DryCheck

Easidew DryCheck User’s Manual
iv 97108 Issue 13, July 2017
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 / ppmVRange ............................................................... 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 ppmVSet-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

Easidew DryCheck User’s Manual
Michell Instruments v
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 ppmV
)...................................................................18
Figure 14 Set-up Data Communications Parameters...................................................20
Figure 15 Sensor Removal .......................................................................................23
Figure 16 Inspection/Cleaning..................................................................................24
Figure 17 System Drawings......................................................................................29
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
Tables
Table 1 Monitor Front Panel Controls and Indicators ..................................................4
Table 2 Function Keys..............................................................................................5
Table 3 Summary of Electrical Connections ...............................................................7

Easidew DryCheck User’s Manual
vi 97108 Issue 13, July 2017
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 specified 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 offices’ 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 specification.

Easidew DryCheck User’s Manual
Michell Instruments vii
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.

Easidew DryCheck User’s Manual
viii 97108 Issue 13, July 2017
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.
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

Easidew DryCheck User’s Manual
Michell Instruments 1
INTRODUCTION
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:
23
4
1
Figure 2 Unpacking Method
Open the box and unpack carefully (see 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.

Easidew DryCheck User’s Manual
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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.
Sample
Block
Easidew
TX Sensor
Easidew
Online Gas Inlet
Gas Outlet
Needle
Valve Flowmeter
Figure 3 Gas Flow Diagram
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.
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 (ppmV),
range 0 to 3000 ppmV. This option requires the transmitter to be set-up for ppmVeither
at the time of ordering or subsequently via Michell application software. NOTE: No
specific ppmVLED indicator is provided on the monitor; ppmVis selected if
neither the °Cdp nor the °Fdp temperature indicators are illuminated.

Easidew DryCheck User’s Manual
Michell Instruments 3
INSTALLATION
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 (ALr2) is brought to the terminal strip.
2.4 Monitor Panel Layout
Easidew Hygrometer
6
Figure 4 Monitor Panel Layout

Easidew DryCheck User’s Manual
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INSTALLATION
Item Description
1
°Fdp
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, ppmVis selected.
2
°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, ppmVis selected.
3
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 ErrH (error high) and temperature reading for high
temperature over-range.
4
ALr1 Output
Only available directly from the back of the Monitor panel.
5
ALr2
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.
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 ALr2 trip points.
6PSET
The four function keys are used for setting up the
monitor.
Table 2 describes the operation of the keys.
Table 1 Monitor Front Panel Controls and Indicators

Easidew DryCheck User’s Manual
Michell Instruments 5
INSTALLATION
2.5 Function Keys
The function key panel is shown in Figure 4 .
Table 2 describes the operation of the keys.
Item Description
PP(Program) key
This key is used to access the programming menus and to select sub-
menus 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
SET key
Depending upon the context, this key is used to access the set value
of the selected process field and as an Accept key for new parameter
values.
Table 2 Function Keys
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) . A cable gland is provided, through which the power supply cable should be
passed.
The power supply cable should then be connected to the terminal strip which is mounted
on the right hand side.
Terminals are marked:
7 8 9 101112
Earth Not Used Neutral Not used Live Not used

Easidew DryCheck User’s Manual
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INSTALLATION
2.8 Signal Output Connections
The Easidew DryCheck has 1 signal output Alarm 2 (ALr2) and the re-transmitted
input signal (4-20 mA or 0-20 mA current loop signal depending upon instrument
configuration).
Loosen the 2 screws and remove the access cover at the lower front of the instrument
(Figure 5) . The signal cable should then be connected to the terminal strip which is
mounted on the left hand side.
Terminals are marked:
For Alarm Connections For mA Signal
Connections
123456
Normally
Closed
Normally
Open COM Not used + mA - mA
Figure 5 Alarm and Communications
The signal outputs will be connected to external systems that
can potentially influence the operation of the process.
Alarm level signals could be at mains potential so it is essential
that, before connecting these signal lines, checks are made
to ensure that these inputs are not live and that it is safe to
handle them.
Alarm Output
Alarm 2 comprises a set of changeover contacts. Connect incoming signal lines to
terminal 3(common), terminal 2(normally open) and terminal 1(normally closed).
Figure 6 shows the relevant rear panel connections. Table 3 shows a summary of all the
electrical connections to the monitor.

Easidew DryCheck User’s Manual
Michell Instruments 7
INSTALLATION
Figure 6 Monitor Rear Panel Connections
Re-transmission Output
The re-transmission output is current sourcing. Connect the positive output to terminal
14 and the negative output to terminal 13. Use appropriately colored wires eg. red
(positive), black (negative).
Terminal Wire Color Signal Supply Information
1 Blue 0 V (GND)
3 Green 4-20 mA loop current Default 4-20 mA
4Red
Transmitter loop supply
(+ve) +24 V DC w.r.t. terminal 1
7 User defined ALr2 (normally closed)
9
7
8
8 User defined ALr2 (normally open)
9 User defined ALr2 (common)
13 User defined Current loop out (-ve) Default 4-20 mA
14 User defined Current loop out (+ve) Default 4-20 mA
16 User defined ALr1 (common)
16
17
17 User defined ALr2 (normally open)
23 (AC Version) Blue Power in (neutral) 100 – 240 V, 50/60 Hz
24 (AC Version) Brown Power in (live) 100 – 240 V, 50/60 Hz
23 (DC Version) Black Negative (-) 0 V
24 (DC Version) Red Positive (+) 24 V
NOTE: There are no terminals in positions
5, 6, 10, 11, 12, 15, 18, 19, 20, 21 and 22
Table 3 Summary of Electrical Connections

Easidew DryCheck User’s Manual
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INSTALLATION
3 OPERATION
As supplied, the instrument is ready for operation and has been set-up with default
parameters. This section describes both the general operation of the instrument and
the method of setting it up and changing the default parameters should this become
necessary.
The default parameters are as follows:
• Span -100 to +20°Cdp (-148 to +68°Fdp), -60 to +60°Cdp (-76 to
140°Fdp) / -50 to +50°Cdp (-58 to 122°Fdp) or 0 to 3000 ppmV
• Temperature units °Cdp
• Current loop input, 4-20 mA (7.5°C/mA or 13.5°F/mA)
• Re-transmission current loop output, 4-20 mA (7.5°C/mA or 13.5°F/mA)
• Alarm 2 set-point -40°Cdp (-40°Fdp)
For the supplied dew-point transmitter, the span and current loop input setting should
not be changed. The span will require changing if the instrument is to be ranged in °F,
if a different transmitter is employed, if the user chooses to re-range the transmitter or
if ppmVis selected.
The instrument must also have been installed as detailed in Section 2 and connected to
a sample gas supply that is representative of the process being monitored.
3.1 General Operational Information
Operation of the Easidew DryCheck is completely automatic and, once set-up, requires
little or no operator intervention.
The dew-point transmitter is designed to operate in a flowing gas stream of between 1
to 5 Nl/min (2.1 to 10.6 scfh) when mounted in a sample block, at operating pressures
up to a maximum of 10 barg (145 psig).
The sample gas is taken into the sample block via the Gas In port and, in flowing
through the sample block, comes into contact with the dew-point transmitter which,
in turn, produces a current loop output signal proportional to the measured dew-point
temperature. This output signal is converted to a dew-point temperature reading by the
monitor.
If necessary, gas flow through the sample block must be controlled outside the
instrument, typically by means of a needle valve located in the sample gas input line.

Easidew DryCheck User’s Manual
Michell Instruments 9
OPERATION
3.2 Preparation For Operation
3.2.1 First Time Operation
To commence operation, proceed as follows:
1. Check that electrical power supply and the relevant analog and alarm
outputs are connected to external systems as required and as described
in Section 2.8.
2. Check that the gas sample flow rate through the sample block, or the
pipeline in which the transmitter is located, is within the operational
limits. (Adjust any external flow control valves, located in the gas sample
input line to the instrument to achieve required flow rate.)
3. Switch on the power supply to the instrument. The instrument display
will now come on, typically showing the default parameters and units as
detailed in
Figure 7 .
The instrument is now operational and after a few seconds, in which all the segments of
the display are tested, the monitor will display the measured dew-point temperature as
a steady reading within the range -100 to +20°Cdp (-148 to +68°Fdp), -60 to +60°Cdp
(-76 to 140°Fdp) / -50 to +50°Cdp (-58 to 122°Fdp) or 0 to 3000 ppmVdepending upon
how the instrument has been set-up. The default setting is °C.
In the absence of any error indications the instrument will now be operational using the
default parameters.
Easidew Hygrometer
Figure 7 Typical Display
If the display is flashing, a fault condition exists. The following operational error
conditions may be encountered:
ErrL - If the display is alternately flashing (e.g.) ErrL and -103.3, this
indicates that the measured dew point is outside the lower operational limit
(-100°Cdp/-148°Fdp).
If the display is alternately flashing ErrL and -129.9 (-199.9 if set-up to read
temperature in °F), this could be an indication that the input current loop to
the monitor is open or that there may be a transmitter fault. Check that the
transmitter is wired correctly as detailed in Section 2.8.
ErrH - If the display is alternately flashing (e.g.) ErrH and 021.4, this
indicates that the measured dew point is outside the upper operational
limit (+20°Cdp/+68°Fdp).

Easidew DryCheck User’s Manual
10 97108 Issue 13, July 2017
OPERATION
3.3 System Alarms
3.3.1 Alarm Switching Logic (Default)
The Easidew DryCheck has one alarm output. As supplied, the default alarm set-point
and the alarm switching logic are as follows (the default temperature units are degrees
Celsius):
Alarm 2 (High Alarm) is set to switch ON when the temperature reading is higher (gas
wetter) than its set-point value. For the default set-points therefore, the operation of
this alarm would be as follows:
Alarm 2 Temp < -40 Alarm 2 = OFF
Temp > -40 Alarm 2 = ON
Depending upon the application, if required, it is possible to reverse the switching logic
for either or both of the alarm channel outputs to provide the following alarm output
configurations:
Alarm 2 Temp < -40 Alarm 2 = ON
Temp > -40 Alarm 2 = OFF
Section 3.3.2 describes the method for reversing the default switching logic and Section
3.3.3 describes the method for setting up individual alarm set-points.
3.3.2 Reversal of Alarm Switching Logic
As described in Section 3.3.1, the switching logic for the alarm channel may, if required,
be reversed.
Starting at the default state, the method of reversing the switching logic for the alarm
is as follows:
1. Press the
Pkey once and the display will read tECH.
2. Press the
SET key and the display will flash between ConF and PinP.
3. Press the key three times and the display will flash between ConF and
Alr2.
4. Press the
SET key twice to display Alt2.
5. Press the key once to display a flashing 4 digit number. For the Alarm
2 default setting this will be 0000.
6. Press the key once to change the display to 0001.
7. Press the
SET key to store the new value.
8. Press the
Pkey twice to return.

Easidew DryCheck User’s Manual
Michell Instruments 11
OPERATION
P
SET
x3
P
P
SET
SET
x2
Main
Display
Main
Display
Figure 8 Change Alarm Switching Logic

Easidew DryCheck User’s Manual
12 97108 Issue 13, July 2017
OPERATION
3.3.3 Alarm Level Set-Up
Figure 9
Set-up Alarm Levels
SET
SET
Set x2
Current
Value
New
Value
P to exit
without
setting
Main display
P
The alarm set-point levels are set-up
from the program menu as follows
(to exit to the Main Display without
saving any new settings press the P
key):
Figure 9 shows the operational key
sequence.
To set-up the alarm set-point:
1. Press the
SET key twice.
2. Press the key to display the
flashing current Alarm 2 set-point
(-40°C in this example).
3. Use the or keys to set the
required value (-50°C in this
example).
4. Press the
SET key once to store the
new value for Alarm 2. The display
then returns to the main dew-point
temperature display.