Easidew
Dew-Point Transmitter
User’s Manual
97504 Issue 3.1
May 2019
Please fill out the form(s) below for each instrument that has been purchased.
Use this information when contacting Michell Instruments for service purposes.
Transmitter
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Transmitter
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Transmitter
Code
Serial Number
Invoice Date
Location of Instrument
Tag No
Easidew
For Michell Instruments' contact information please go to www.michell.com
© 2019 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 Transmitter User’s Manual |
|
|
||
|
|
||
Contents |
|
||
Safety........................................................................................................................................ |
|
v |
|
|
Electrical Safety................................................................................................................... |
v |
|
|
Pressure Safety................................................................................................................... |
v |
|
|
Toxic Materials.................................................................................................................... |
v |
|
|
Repair and Maintenance...................................................................................................... |
v |
|
|
Calibration |
v |
|
|
Safety Conformity................................................................................................................ |
v |
|
Abbreviations............................................................................................................................ |
vi |
||
Warnings................................................................................................................................... |
|
vi |
|
1 |
INTRODUCTION........................................................................................................... |
1 |
|
2 |
INSTALLATION............................................................................................................. |
2 |
|
|
2.1 |
Unpacking .........................................................................................the Instrument |
2 |
|
2.2 Preparation .................................................................................of the Sensor Cable |
3 |
|
|
2.3 |
Cable ......................................................................................................Connection |
4 |
|
2.4 |
Electrical ...................................................................................................Schematic |
5 |
|
2.4.1 |
............................................................................................ |
6 |
|
2.4.2 |
............................................................. |
6 |
|
2.5 |
Transmitter ..............................................................................................Installation |
6 |
|
2.5.1 |
...................................................................................... |
6 |
|
2.5.2 |
.................................................................................................... |
8 |
|
2.5.3 |
......................................................................................... |
11 |
|
2.5.3.1 .................................................................................... |
11 |
|
|
2.5.3.2 .................................................................................. |
12 |
|
|
2.5.3.3 ..................................................................................... |
12 |
|
|
2.5.3.4 .................................................. |
12 |
|
3 |
MAINTENANCE........................................................................................................... |
14 |
|
Figures |
|
|
|
Figure 1 |
.......................................................... |
2 |
|
Figure 2 |
.................................................................... |
3 |
|
Figure 3 |
.......................................................................................... |
3 |
|
Figure 4 |
...................................................................................... |
4 |
|
Figure 5 |
...................................................................................... |
5 |
|
Figure 6 |
.............................................................................. |
5 |
|
Figure 7 |
..................................... |
6 |
|
Figure 8 |
......................................................................................... |
7 |
|
Figure 9 |
................................................................. |
8 |
|
Figure 10 |
...................................................................... |
9 |
|
Figure 11 |
................................................................................................. |
10 |
|
Figure 12 |
................................................................ |
11 |
|
Figure 13 |
................................................................ |
13 |
|
Figure 14 |
.......................................................................... |
14 |
|
Figure 15 |
................................................................................... |
17 |
|
Appendices |
|
||
Appendix A |
.................................................................................... |
17 |
|
Appendix B |
......................................................... |
20 |
|
Appendix C |
.............................................. |
22 |
|
Appendix D |
....................................................................................... |
24 |
|
iv |
97504 Issue 3.1, May 2019 |
Easidew Transmitter 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 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. For Michell Instruments’ contact information please go to www.michell.com.
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 and US standards and directives. Further details of applied standards may be found in the Technical Specifications in Appendix A.
Michell Instruments |
v |
Easidew Transmitter User’s Manual
Abbreviations
The following abbreviations are used in this manual:
barg |
pressure unit (=100 kP or 0.987 atm) gauge |
ºC |
degrees Celsius |
ºF |
degrees Fahrenheit |
DC |
direct current |
ft-lbs |
foot-pound force |
ggrams
in |
inch(es) |
µm |
micrometer |
m/sec |
meters per second |
mA |
milliampere |
max |
maximum |
mm |
millimetres |
MPa |
megapascal |
Nl/min |
normal liters per minute |
Nm |
Newton meter |
oz |
ounces |
ppmV |
parts per million by volume |
psig |
pounds per square inch |
RH |
relative humidity |
scfh |
standard cubic feet per hour |
scfs |
standard cubic feet per second |
Ttemperature
VVolts
ΩOhms
ødiameter
Warnings
The following general warning listed below is applicable to this instrument. It is 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.
vi |
97504 Issue 3.1, May 2019 |
Easidew Transmitter User’s Manual |
INTRODUCTION |
|
|
|
|
1 INTRODUCTION
The Michell Instruments Easidew is a 4-20mA loop-powered dew-point transmitter, designed to make dew point measurements in a flowing sample. The Easidew transmitter is available with 3 different process connections:
•5/8" - 18 UNF : Easidew 2-wire, Easidew M12
•3/4" - 16 UNF : Easidew 34, Easidew M12
•G1/2 : Easidew M12
The Easidew 2-wire is available with a choice of electrical connections:
•DIN 43650 Form C
•M12 5-Pin
Michell Instruments |
1 |
INSTALLATION |
Easidew Transmitter User’s Manual |
|
|
|
|
2 INSTALLATION
2.1Unpacking the Instrument
On delivery, please check that all the following standard components are in the packing tube:
•Easidew Transmitter
•Certificate of Calibration
•Connector (for sensor/cable)
The Transmitter will also be supplied with a process seal, which will be fitted to the unit. Depending on the version, this will either be a bonded seal (5/8" or G1/2" thread versions) or an o-ring seal (3/4" thread versions).
Unpack the dew-point transmitter tube as follows:
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
Figure 1 DIN43650 Transmitter Unpacking Method
1.Unscrew the cap (1) from the packing tube (8).
2.Remove the foam block (3) containing the connector (2).
3.Pull out the transmitter (5) from the tube, complete with the two foam covers (6) and (7) and the red protective cap (4).
4.Remove the foam covers from the transmitter but leave the blue plastic protective cover (5) and the red cap (4) 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.
NOTE: Keep the connector (2) in a safe place until the transmitter is ready for wiring.
2 |
97504 Issue 3.1, May 2019 |
Easidew Transmitter User’s Manual |
INSTALLATION |
|
|
|
|
2.2Preparation of the Sensor Cable
The sensor cable is NOT supplied as standard. Cables can be obtained by contacting your local Michell Instruments representative (see www.michell.com for details).
DIN 43650 Version
Cable connection to the Easidew 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.
|
O-ring |
and washer |
Figure 2 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.
The sensor cables are terminated as per the following diagram:
GN
RD
BL
|
|
|
BRAID |
SCREEN |
BRAID |
|
|
GREEN |
|
|
|
|
|
SHORT POSSIBLE |
|
|
|
|
|
|
SIGNAL (SOURCE) |
GREEN |
|
||||
|
|
|
||||
|
|
1 |
|
|
YELLOW |
|
|
3 |
BLUE |
|
BLUE |
||
|
|
|
|
|||
AS |
RED |
GND |
|
|
RED |
|
+POWER |
2 4 |
|
|
|
|
|
|
|
|
|
|
|
|
VIEW ON REAR
OF CONNECTOR
SCALE 2:1
GREEN 4-20 mA
RED + POWER
BLUE - GND / SCREEN
GREEN 4-20 mA (SOURCE)
BLUE - GND / SCREEN RED + POWER
Figure 3 Wiring Connections
Note: The screen should only be connected to a ground point at either the transmitter installation side, or at the receiving equipment. Failure to observe this precaution can result in ground loops and equipment malfunction.
Michell Instruments |
3 |
INSTALLATION |
Easidew Transmitter User’s Manual |
|
|
|
|
Always connect the 4-20 mA return signal to a suitable load (see Figure 3) before the power is applied. Without this connection, the transmitter may be damaged if allowed to operate for prolonged periods.
M12 5-Pin Version
Cables with moulded M12 connectors are available from Michell Instruments in the following lengths:
•0.8m
•2m
•5m
|
4-20 mA 2-wire |
PIN 1 |
Modbus B |
PIN 2 |
Modbus A |
PIN 3 |
4-20 mA |
PIN 4 |
Power supply |
PIN 5 |
0V |
|
M12 5-WAY |
|
A CODED |
2 |
1 |
|
5 |
3 |
4 |
Figure 4 Sensor Connector Installation
The other end of the sensor cable is unterminated, for straightforward connection into the desired monitoring system.
|
|
CABLE ASSEMBLY CONNECTIONS |
||
FUNCTION |
|
PIN |
|
WIRE COLOUR |
MODBUS B |
|
1 |
|
BROWN |
MODBUS A |
|
2 |
|
WHITE |
4 - 20 mA |
|
3 |
|
BLUE |
POWER SUPPLY |
|
4 |
|
BLACK |
Ov |
|
5 |
|
GREY |
|
Figure 5 |
Cable connections |
||
If longer cable runs are required, off-the-shelf 5-pin M12 cables can be connected between the Easidew transmitter and the cable provided by Michell Instruments.
Note: The screen should only be connected to a ground point at either the transmitter installation side, or at the receiving equipment. Failure to observe this precaution can result in ground loops and equipment malfunction.
4 |
97504 Issue 3.1, May 2019 |
Easidew Transmitter User’s Manual |
INSTALLATION |
|
|
|
|
2.3Cable Connection
DIN 43650 Version
To ensure the specified ingress protection is achieved, when installing the connector, the securing screw (with the O-ring and washer) must be tightened to a minimum torque of 3.4 Nm (2.5 ft-lbs). The sensor cable used must be a minimum diameter of 4.6mm (0.2”).
O-ring |
|
|
and washer
Figure 6 Connector Installation
M12 5-Pin Version
The connector should be installed by aligning the locating pin on the transmitter with the slot on the cable. The connector can then be pushed into place and rotated until finger-tight.
2.4Electrical Schematic
Note: The screen should only be connected to a ground point at either the transmitter installation side, or at the receiving equipment. Failure to observe this precaution can result in ground loops and equipment malfunction.
3
1
|
|
+ |
Supply |
|||
|
|
|||||
|
|
|
Max Load |
12V |
Min |
|
Screen/ |
|
|
200R @ 12V |
|||
|
|
28V |
Max |
|||
Shield |
|
|
500R @ 24V |
|||
|
|
|
|
|||
|
|
|
|
|
|
|
Figure 7 2-Wire Connection Diagram
Michell Instruments |
5 |
Loading...