Michell Instruments Cermet II User manual

Cermet II
Hygrometer
User’s Manual
97049 Issue 25.3
October 2016
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© 2016 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.
For Michell Instruments' contact information please go to
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Cermet II User’s Manual
iv 97049 Issue 25.3, October 2016
1 INTRODUCTION ................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking the Instrument................................................................................... 2
2.1.1 Unpacking the Cermet II Transmitter.............................................................. 3
2.1.2 Unpacking the Cermet II Monitor ................................................................... 4
2.1.3 Accessories Pack .......................................................................................... 4
2.2 Cermet II Components ....................................................................................... 5
2.3 Monitor.............................................................................................................. 6
2.4 Monitor Panel Layout .......................................................................................... 6
2.5 Preparation of the Transmitter Cable.................................................................... 7
2.6 Transmitter Mounting.......................................................................................... 8
2.6.1 Transmitter Mounting - Sample Block and Gas Connections (Optional) .............. 9
2.6.2 Transmitter Mounting - Direct Pipeline Connection......................................... 11
2.6.3 Transmitter Mounting - With Additional Process Connection Adapter .............. 12
2.7 Monitor Mounting ............................................................................................. 13
2.8 Electrical Connections ....................................................................................... 14
2.8.1 High Voltage Power Supply Input ................................................................. 14
2.8.2 Low Voltage Power Supply Input ................................................................. 15
2.9 Pressure Transducer Connection (Optional) ........................................................ 15
2.10 Transmitter Cable Connection............................................................................ 16
3 OPERATION - MONITOR...................................................................................17
3.1 Set-Up Security Feature .................................................................................... 17
3.2 Selecting the Engineering Units ......................................................................... 18
3.3 Changing the Setpoint Values ............................................................................ 18
3.4 Hysteresis, Make/Break delay & delay type......................................................... 19
3.5 Analog Output Scaling ...................................................................................... 19
3.6 Display Brightness Adjustment .......................................................................... 20
3.7 Digital Communications..................................................................................... 20
3.8 Pressure Compensation..................................................................................... 21
3.9 Using a Pressure Transducer ............................................................................. 21
3.9.1 Manual Pressure Input Calibration ................................................................ 22
3.10 Automatic Pressure Input Calibration ................................................................. 22
3.11 Using a Fixed Pressure Input in Single Channel Mode.......................................... 23
4 OPERATION - TRANSMITTER............................................................................24
5 MAINTENANCE................................................................................................25
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

Cermet II User’s Manual
Michell Instruments v
Tables
Table 1 Cable Connections.....................................................................................16
Table 2 Operation Access Levels............................................................................. 17
Figures
Figure 1 Unpacking - Monitor and Accessories ...........................................................2
Figure 2 Transmitter Unpacking Method ....................................................................3
Figure 3 Unpacking - Monitor ...................................................................................4
Figure 4 Unpacking - Accessories Pack......................................................................4
Figure 5 Components...............................................................................................5
Figure 6 Control Layout and Functions ......................................................................6
Figure 7 Connector Terminal Block Removal ..............................................................7
Figure 8 Sample Block Gas Connections ....................................................................9
Figure 9 Transmitter Mounting - Sensor Block..........................................................10
Figure 10 Transmitter Mounting - Pipe or Duct...........................................................11
Figure 11 Transmitter Mounting with Adapter ...........................................................12
Figure 12 Mounting the Monitor ...............................................................................13
Figure 13 High Voltage Power Supply Connections.....................................................14
Figure 14 Low Voltage Power Supply Connections......................................................15
Figure 15 Electrical Connection Detail .......................................................................15
Figure 16 Cable Connections....................................................................................16
Figure 17 Connector Installation...............................................................................16
Figure 18 Location of the Lockout Switches...............................................................17
Figure 19 Installation Location .................................................................................24
Figure 20 Indication of Dead Space ..........................................................................24
Figure 21 Replacement of HDPE Guard .....................................................................25
Appendices
Appendix A Technical Specifications.............................................................................. 27
Appendix B Setup Codes .............................................................................................30
Appendix C Register Settings Accessible by Digital Communication ................................ 33
Appendix D EU Declaration of Conformity......................................................................36
Appendix E Quality, Recycling & Warranty Information...................................................38
E.1 Pressure Equipment Directive (PED) 97/23/EC ............................... 38
E.2 Recycling Policy .......................................................................... 38
E.3 WEEE Compliance........................................................................ 38
E.4 RoHS2 Compliance ...................................................................... 39
E.5 Warranty..................................................................................... 39
E.6 REACH Compliance ...................................................................... 40
E.7 Return Policy ............................................................................... 40
E.8 Calibration Facilities ..................................................................... 41
E.9 Manufacturing Quality .................................................................. 41
E.10 FCC (EMC REquirements for North America) .................................. 41
Appendix F Return Document & Decontamination Declaration........................................ 43

Cermet II User’s Manual
vi 97049 Issue 25.3, October 2016
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.
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 45 MPa (450 barg / 6500 psig). Refer to the Technical
Specifications in Appendix A.
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 the Cermet II transmitter 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.
Michell Instruments can offer a variety of re-calibration and exchange transmitter schemes to suit
your specific needs. A local representative will be pleased to provide detailed, custom advice.
Safety Conformity
This product meets the essential protection requirements of the relevant EU directives.

Cermet II User’s Manual
Michell Instruments vii
Abbreviations
The following abbreviations are used in this manual:
AC alternating current
atm pressure unit (atmosphere)
barg pressure unit (=100 kP or 0.987 atm) (gauge)
DC direct current
EU European Union
g/m3grams per cubic meter
Hz Hertz
lb pound
lbs/MMSCF pounds per million standard cubic feet
Nl/min liters per minute
mA milliampere
Nm nanometer
ppmVparts per million (by volume)
psig pound(s) per square inch (gauge)
sec second(s)
°C degrees Celsius
°F degrees Fahrenheit
V Volts
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.
DANGER
Electric
Shock Risk
Where this symbol appears in the following sections it is used to
indicate areas of potential risk of electric shock.

Cermet II User’s Manual
Michell Instruments 1
INTRODUCTION
1 INTRODUCTION
The Cermet II hygrometer is an instrument designed for the continuous online
measurement of moisture content in non-corrosive gases, over an operational range
of -100 to +20°C (-148 to +68°F) dew point and equivalent units (see Technical
Specifications, Appendix A).
The system comprises a programmable monitor configured to accept a unique Michell
data string from the Cermet II transmitter. The zero and span of the monitor are set to
cover the dew-point range -100 to +20°Cdp (-148 to +68°Fdp) at operating pressures
up to 45 MPa (450 barg / 6500 psig).
Two alarm outputs are provided for connection to external systems which are user-
configurable both in terms of setpoint and operating mode. Current output is standard
and factory set at 4-20 mA (or optionally set at 0-20 mA or 0-10 V).
The monitor has a pressure input channel for any industry standard 2-wire pressure
transmitter. In addition to providing a pressure measurement, the pressure signal can
be used to provide real-time pressure compensation on the primary channel when
displaying ppm values. The customer can also set a fixed pressure compensation value.
The pressure input only affects the ppmV(parts per million by volume), lbs/MMSCF
(pounds per million standard cubic feet) and g/m3(grams per cubic meter) units. For
dew point, the displayed value is a pressure dew point.
1.1 Features
• Wide measurement range, calibrated -100 to +20°Cdp
• ±1°Cdp measurement accuracy
• Pressure sensor input
• Up to 4 alarm relays
• User selectable units of measurement
• Easy to read display
• Analog and digital outputs

Cermet II User’s Manual
297049 Issue 25.3, October 2016
INSTALLATION
2 INSTALLATION
!
It is essential that the connection of electrical and gas supplies
to this instrument be undertaken by competent personnel.
2.1 Unpacking the Instrument
The Cermet II hygrometer and accessories are packed in a box and the method of
unpacking is shown as follows:
Figure 1 Unpacking - Monitor and Accessories

Cermet II User’s Manual
Michell Instruments 3
INSTALLATION
2.1.1 Unpacking the Cermet II Transmitter
On delivery, check that all the following standard components are in the packing tube:
• Cermet II Transmitter
• Bonded Seal
• Certificate of Calibration
Unpack the dew-point transmitter tube as follows:
7653 421
Figure 2
Transmitter Unpacking Method
1. Unscrew the cap (1) from the packing tube (7).
2. Remove the foam block (2).
3. Pull out the transmitter (4) from the tube, complete with the two foam
covers (5) and (6) and the red protective cap (3).
4. Remove the foam covers from the transmitter but leave the blue plastic
protective cover (4) and the red cap (3) in place until ready for installation.
NOTE: The transmitter sensing element is protected while in transit by a blue
cover containing a small desiccant capsule. The connection pins are protected
by a red plastic cap. None of these plastic items are required for the operation
of the transmitter.

Cermet II User’s Manual
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INSTALLATION
2.1.2 Unpacking the Cermet II Monitor
The monitor (2) is packed, together with its fixing clamps (1) as shown below.
1
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Figure 3 Unpacking - Monitor
2.1.3 Accessories Pack
The accessories pack is shown below:
1
2
3
4
Figure 4 Unpacking - Accessories Pack

Cermet II User’s Manual
Michell Instruments 5
INSTALLATION
2.2 Cermet II Components
On delivery, please check that all the following standard components are present in the
packing box. Report any shortages immediately.
2
6
4
5
98
3
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Cermet II
Hygrometer
User’s Manual
97049 Issue 25.1
June 2015
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Figure 5 Components
1. Cermet II Monitor
2. Clamps
3. Transmitter cable assembly
4. Cermet II Transmitter
5. Screwdriver
6. Power cable
7. User’s manual
8. Calibration certificate
9. Sample block

Cermet II User’s Manual
697049 Issue 25.3, October 2016
INSTALLATION
2.3 Monitor
The monitor has a 5-digit display, set-up on delivery to display a dew-point temperature
range of -100° to +20°Cdp (-148° to +68°Fdp).
Dew-point temperature units are displayed by the last LED located to the far right of
the display. On delivery, °Cdp is set-up. If required, the units can be changed to °F. The
method of configuring the unit for °F is described in Section 3.2.
Optionally, the instrument can be set-up to read moisture content in parts per million
(ppmV), pounds per million standard cubic feet (lbs/MMSCF) or grams per cubic meter
(g/m3). This option requires the hygrometer to be set-up as detailed in Section 3.2.
Four alarm indications are provided by four LEDs located on the bottom of the display.
These are marked SP1, SP2, SP3, SP4. Access to the alarm relay contacts is provided
on the rear panel. The connection for these alarm relay contacts is shown in
Figure 15 .
NOTE: Every monitor is factory fitted with 2 alarm relays as standard.
2.4 Monitor Panel Layout
Figure 6 shows the layout of these controls and their respective operational functions.
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1
2
3
4
h
h
h h
1Increases the value of the displayed parameter; moves through each
displayed parameter
2Decreases the value of the displayed parameter; moves through each
displayed parameter
3 LED annunciations for Setpoints 1 - 4
4 Saves programming settings, moves between programming steps
Figure 6
Control Layout and Functions

Cermet II User’s Manual
Michell Instruments 7
INSTALLATION
2.5 Preparation of the Transmitter Cable
The transmitter cable is supplied as standard. Replacement of additional cables can be
obtained by contacting your local distributor or Michell Instruments (see www.michell.
com for details).
The cable is pre-wired so no user wiring is required. If the cable needs to be re-wired,
see below:
Cable connection to the Cermet II transmitter is made via the removable connector.
Removing the central screw enables the connector terminal block to be removed from
the outer housing by using a small screwdriver to prise it clear.
i
O-ring
and washer
Figure 7 Connector Terminal Block Removal
Caution: When removing the central screw ensure that the
small sealing O-ring and the washer are retained on the screw
and are present during re-installation.

Cermet II User’s Manual
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INSTALLATION
2.6 Transmitter Mounting
Prior to installation of the transmitter, unscrew and remove the blue plastic cover and
retain for future use. Take care to prevent any contamination of the transmitter before
installation (handle the transmitter by the main body only, avoiding contact with the
sensor guard).
The transmitter can be mounted into either a flow-through sampling block (optional) or
directly inserted into a pipe or duct and can be operated at pressures of up to 45 MPa
(450 barg / 6500 psig) when fitted with the bonded seal provided.
The recommended gas flow rate, when mounted in the optional sampling block, is 1 to
5 Nl/min (2.1 to 10.6 scfh). However, for direct insertion applications, gas flow can be
from static to 10 m/sec (32.8 fps).
NOTE: Pass the bonded seal over the 5/8”- 18 UNF mounting thread and
assemble into the sampling location by hand using the wrench flats only. DO
NOT grip and twist the transmitter cover when installing the transmitter.
When installed, fully tighten using a wrench until the seal is fully compressed and to the
following torque setting:
5/8” - 18 UNF 30.5 Nm (22.5 ft-lbs)

Cermet II User’s Manual
Michell Instruments 9
INSTALLATION
2.6.1 Transmitter Mounting - Sample Block and Gas Connections (Optional)
Sample gas connections are made to the Gas In and Gas Out ports on the sample block
see Figure 8. Either port on the sample block may be used as the Gas Input port (i.e.
for connection purposes the ports are interchangeable).
Normally, connections are made via stainless steel pipework, in which case the sensor
block/transmitter assembly will be self supporting. If Teflon tubing is used it may be
necessary to support the assembly with a body clip.
1
1
2
2345
3
4
5
6
1
2
3
4
5
Figure 8 Sample Block Gas Connections
Both the Input and Output gas connections are ⅛” NPT. It is recommended that both
the Gas Input and Output connections are made made via ⅛” NPT to 6mm or ⅛” NPT
to ¼” stainless steel tube adaptors (2 to 5 - Figure 8) . The method of connection to the
sensor block (6) is as follows:
NOTE: The following description relates to 6mm tube fixings. The sample
block ports are both ⅛” NPT female process connections. Tube adaptors are
not supplied with the equipment but can be obtained by contacting your local
distributor or Michell Instruments (see www.michell.com for details).
1. Cut a suitable length of 6mm (¼” U.S.) stainless steel tubing (1) to the
correct length and, if necessary, bend to shape to suit the location of the
sensor block assembly. NOTE: To facilitate ease of connection to the
port, at least 75mm (3”) of the tubing coming out of the Gas In
port must be straight.
2. Clean off any burrs or metal shavings adhering to the tubing.
3. Screw the ⅛” NPT (¼” U.S.) NPT Swagelok adaptor (5) into the ⅛” NPT
(¼” U.S.) NPT inlet port in the sensor block (6) and tighten to a torque
setting of 35 Nm (25 lbf-ft).
4. Pass the stainless steel tubing (1) through the locking nut (2). NOTE:
Threads towards the gas port.
5. Fit the back ferrule (3) over the stainless steel tubing (1) with the bevelled
end facing the back of the front ferrule (4).
6. Place the front ferrule (4) over the stainless steel tubing (1), bevelled end
towards the adaptor (5).

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INSTALLATION
7. Push the stainless steel tubing (1) as far as it will go into the adaptor (5)
and tighten up the locking nut (2) finger tight.
8. Hold the adaptor (5) flats with a spanner and tighten up the locking
nut (2) to a torque setting of 35 Nm (25 lbf-ft) (1¼ turns). This action
compresses the front ferrule (4) and back ferrule (3) onto the tubing to
form a gas tight seal.
9. Connect up the other gas port as described in steps 1 to 8 above.
The following procedure must be carried out by a
qualified installation engineer.
To mount the transmitter into the sample block (preferred method), proceed as follows,
refer to Figure 9.
1. Remove the blue protective cover (2) and its desiccant capsule (2a), from
the tip of the transmitter.
2. Fit the bonded seal (3) over the threaded part of the transmitter body.
WARNING: Under no circumstances should the sensor
guard be handled with the fingers.
3. Screw the transmitter (1) into the sample block (4) and tighten to a
minimum torque setting of 30.5 Nm (22.5 ft-lbs). NOTE: Use the flats
of the hexagonal nut and not the transmitter body.
4. Fit the transmitter cable/connector assembly to the plug located on the
base of the transmitter and tighten the fixing screw (see Section 2.10).
1
2
3
2a 4
Figure 9 Transmitter Mounting - Sensor Block

Cermet II User’s Manual
Michell Instruments 11
INSTALLATION
2.6.2 Transmitter Mounting - Direct Pipeline Connection
The transmitter may be directly mounted into a pipe or duct, as shown in Figure 10.
CAUTION: Do not mount the transmitter too close to the
bottom of a bend where any condensate in the pipeline
might collect and saturate the probe.
The pipe or duct will require a thread to match the transmitter body thread. Fixing
dimensions are shown in Figure 10 . For circular pipework, to ensure the integrity of a
gas tight seal, a mounting flange will be required on the pipework in order to provide a
flat surface to seal against.
The following procedure must be carried out by
competent personnel.
1. Ensure that the blue protective cover (and its desiccant capsule) has been
removed from the tip of the transmitter.
WARNING: Under no circumstances should the
sensor guard be handled with the fingers.
2. Fit a bonded seal (2) over the threaded part of the transmitter body.
3. Screw the transmitter (3) into the pipe (1). Tighten enough to obtain a
gas tight seal. (Torque will depend upon the pipeline material.) NOTE: Do
not overtighten or the thread on the pipework may be stripped.
LV
(1.9”)
1
1
2
2
3
3
48mm
Figure 10 Transmitter Mounting - Pipe or Duct

Cermet II User’s Manual
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INSTALLATION
2.6.3 Transmitter Mounting - With Additional Process Connection Adapter
!The following procedure must be carried out by a qualified
installation engineer.
To mount the adapter into the transmitter, proceed as follows (see Figure 11) :
1. Ensure that the protective cover (2), and its desiccant capsule (2a), have
been removed from the tip of the transmitter.
2. Fit the bonded seal (3) over the threaded part of the transmitter body.
3. Screw the adapter (4) onto the threaded part of the transmitter and tighten
to 30.5 Nm (22.5 ft-lbs). NOTE: Use the flats of the hexagonal nut and
not the transmitter body.
!WARNING: Under no circumstances should the sensor guard be
handled with the fingers.
4. Screw the transmitter (1) with its seal (3) and adapter (4) into the sample
block (see Section 2.6.1) or pipeline (see Section 2.6.2) and fully tighten
using a wrench until the seal is fully compressed and to the following torque
settings:
G 1/2” BSP 56 Nm (41.3 ft-lbs)
3/4” - 16 UNF ` 40 Nm (29.5 ft-lbs)
1/2” NPT Use a suitable sealant e.g. PTFE tape using
correct taping procedures
NOTE: Use the flats of the hexagonal nut and not the transmitter
body.
1
2
34
2a
Figure 11 Transmitter Mounting with Adapter

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Michell Instruments 13
INSTALLATION
2.7 Monitor Mounting
The monitor is designed for panel mounting and requires a panel cut-out of 46 x 92mm
(1.8 x 3.6”). The recommended panel thickness is 2 to 5mm (0.08 to 0.2”).
To mount the unit, proceed as follows:
3
2
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Figure 12 Mounting the Monitor
1. Pass the monitor (1) through the front of the panel (2).
2. Support the monitor and attach mounting fixing brackets onto the
side of the monitor.
3. Tighten the fixing screw (3) finger tight, against the back of the
panel.
4. Ensure that the monitor is sitting flush to the front of the panel (2)
and tighten the fixing screws evenly against the back of the panel.
Caution: Do not overtighten the screws as this could cause the case to crack.