Easidew I.S.
Dew-Point Transmitter
User’s Manual
Kahn Instruments, Inc. 2015
This document is the property of Kahn Instruments and may not, either in part or whole, be copied or
otherwise reproduced, communicated in any way to third parties nor stored in any data processing
system, without the written authority of Kahn Instruments, Inc.
Easidew I.S.
For Kahn Instruments' contact information please go to
www.kahn.com
© 2015 Kahn Instruments
This document is the property of Kahn Instruments, Inc. 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 Kahn Instruments, Inc.
Easidew I.S. User’s Manual
Kahn Instruments 3
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 ................................................................................................1
1.1 Features ............................................................................................................ 1
2 INSTALLATION ..................................................................................................2
2.1 Unpacking the Instrument ................................................................................... 2
2.2 Preparation of the Sensor Cable .......................................................................... 3
2.3 Cable Connection ............................................................................................... 5
2.4 Electrical Schematic ............................................................................................ 5
2.4.1 Electrical Boundaries ..................................................................................... 6
2.5 Transmitter Mounting .......................................................................................... 6
2.5.1 Transmitter Mounting - Sample Block (Optional) .............................................. 7
2.5.2 Transmitter Mounting - Direct Pipeline Connection ........................................... 8
2.5.3 Transmitter Mounting - With Additional Process Connection Adapter ................ 9
3 OPERATION ....................................................................................................10
4 MAINTENANCE ................................................................................................11
4.1 O-Ring Replacement ......................................................................................... 12
Figures
Figure 1 Transmitter Unpacking Method ....................................................................2
Figure 2 Connector Terminal Block Removal ..............................................................3
Figure 3 Bare Wires .................................................................................................3
Figure 4 Crimped Wires ...........................................................................................3
Figure 5 Cut to 5mm ...............................................................................................4
Figure 6 Connection to Connector Terminal Block .......................................................4
Figure 7 Wiring Connections .....................................................................................4
Figure 8 Connector Installation .................................................................................5
Figure 9 2-Wire Connection Diagram .........................................................................5
Figure 10 Electrical Connections .................................................................................5
Figure 11 Maximum Load of Easidew - Including Cable Resistance ................................6
Figure 12 Transmitter Mounting ..................................................................................7
Figure 13 Transmitter Mounting - Pipe or Duct.............................................................8
Figure 14 Transmitter Mounting with Adapter .............................................................9
Figure 15 Installation Location .................................................................................10
Figure 16 Indication of Dead Space ..........................................................................10
Figure 17 Replacement of HDPE Guard .....................................................................11
Figure 18 Dimensions .............................................................................................15
Easidew I.S. User’s Manual
4 97099 Issue 13.4, August 2015
Appendices
Appendix A Technical Specications ............................................................................. 14
A.1 Dimensions .................................................................................15
Appendix B System Drawings ....................................................................................... 17
B.1 Baseefa Approved System Drawing ...............................................17
B.2 FM Approved System Drawing ......................................................18
B.3 CSA Approved System Drawing .....................................................19
Appendix C Hazardous Area Certication ......................................................................21
C.1 Product Standards .......................................................................21
C.2 Product Certication ....................................................................21
C.3 Global Certicates/Approvals ........................................................21
C.4 Terminal Parameters ....................................................................21
C.5 Special Conditions of Use .............................................................22
C.6 Maintenance and Installation ........................................................ 22
Appendix D EC Declaration of Conformity ...................................................................... 24
Easidew I.S. User’s Manual
Kahn Instruments 5
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 insure 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 specied safe working pressure is 6500 psig (450 barg / 45 MPa). Refer to the Technical
Specications 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 by Kahn Instruments, Inc.. Refer to www.kahn.com for contact
details.
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,
Kahn Instruments Inc., or one of their accredited service agents for re-calibration.
Safety Conformity
This product meets the essential protection requirements of the relevant US and European standards
and directives. Further details of applied standards may be found in the Technical Specications in
Appendix A.
Easidew I.S. User’s Manual
6 97099 Issue 13.4, August 2015
Abbreviations
The following abbreviations are used in this manual:
barg pressure unit (=100 kP or 0.987 atm) (bar gauge)
°C degrees Celsius
°F degrees Fahrenheit
DC direct current
dp dew point
fps feet per second
ft-lbs feet per pounds
g grams
lbs/in pounds per inch
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
ppm
V
parts per million by volume
psig pounds per square inch
RH relative humidity
scfh standard cubic feet per hour
V Volts
Ω Ohms
ø diameter
“ inch(es)
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.
Easidew I.S. User’s Manual
Kahn Instruments 1
INTRODUCTION
1 INTRODUCTION
The Easidew I.S. dew-point transmitter has been manufactured, tested and calibrated
to the highest available standards and should be in perfect working order, ready for
installation into a gas measurement application. If, after reading this manual, there are
any questions about the instrument or how to install and operate it, please contact Kahn
Instruments. Inc. Refer to www.kahn.com for contact details.
This manual covers the following Easidew I.S. (Intrinsically Safe) dew-point products:
Easidew I.S. with 5/8” UNF thread
Easidew I.S. with 3/4” UNF thread
Easidew I.S. with G 1/2” BSP thread
1.1 Features
The Easidew I.S. dew-point transmitter is a continuous, on-line, 4-20 mA transmitter
for the measurement of dew-point temperature or moisture content in air and other
non-corrosive gases. It is designed specically for use within Zone 0, 1 and 2 hazardous
areas.
The key features are:
• IECEx, CSA, FM, ATEX certied transmitter for use in hazardous areas
• 5/8” or 3/4” UNF, G1/2” BSP, process connection
• Dew-point or ppmV moisture content
• 2-wire loop powered connection
• Rugged 316 stainless steel IP66 construction
• Measurement ranges -148 to +68°Fdp (-100 to +20°Cdp)
-166 to +68°Fdp (-110 to +20°Cdp)
• Accuracy ±2°Cdp
• Calibration Certicate (NPL, NIST)
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2 97099 Issue 13.4, August 2015
INSTALLATION
2 INSTALLATION
2.1 Unpacking the Instrument
On delivery, check that all the following standard components are in the packing tube:
• Easidew I.S. Transmitter
5/8” UNF and G 1/2” BSP version - Bonded seal tted over threaded part of
transmitter body
OR
3/4” UNF version - Recessed sensor O-ring seal
• Quantity 3 cable crimps
• Sensor connector
• Packing tube, and foam protectors (not needed for operation - save all
the packing materials for the purpose of returning the instrument for recalibration or any warranty claims)
• Certicate of calibration
NOTE: If any component is not present in the packing box, contact Kahn
Instruments immediately.
Unpack the dew-point transmitter packing tube as follows (see
Figure 1).
G 1/2“ BSP (black)
3/4” UNF (green)
5/8” UNF (blue)
98764 5321
Figure 1
Transmitter Unpacking Method
1. Unscrew the cap (1) from the packing tube (9).
2. Remove the bag containing 3 cable crimps (2).
3. Remove the foam block (4) containing the connector (3).
4. Pull out the transmitter (6) from the tube, complete with the two foam
covers (7) and (8) and the red protective cap (5).
5. Remove the foam covers from the transmitter but leave the green, blue or
black plastic protective cover (6) and the red cap (5) in place until ready
for installation.
NOTE: The transmitter sensing element is protected while in transit by a black,
green or 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 (3) in a safe place until the transmitter is ready
for wiring.
Easidew I.S. User’s Manual
Kahn Instruments 3
INSTALLATION
2.2 Preparation of the Sensor Cable
The sensor cable is NOT supplied as standard. A cable can be obtained by contacting
Kahn Instruments (see www.kahn.com for details).
The crimps supplied must be tted onto any cable installed
into the connector in order to comply with Hazardous Area
Certication of the product.
If making a cable assembly it is important that the cable is correctly terminated. See
Figures 3 to 6
.
Cable connection to the Easidew I.S. 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 pry it off.
O-ring
and washer
Figure 2
Connector Terminal Block Removal
Caution: When removing the central screw insure that the small
sealing O-ring and the washer are retained on the screw and
are present during re-installation.
NOTE:
Figure 3
to
Figure 6
shown below, should be followed in detail. The
crimps should be applied such that there is no possibility of a conductor
strand of a core becoming free (see
Figure 4)
.
Figure 3
Bare Wires
Figure 4
Crimped Wires
Easidew I.S. User’s Manual
4 97099 Issue 13.4, August 2015
INSTALLATION
When the crimp is made it should have a minimum of 2 positions of crimping. After the
crimp is made it should be trimmed to a length of 5mm (see
Figure 5)
. When the crimps
are installed into the connector terminal block insure they are fully inserted, as shown
in
Figure 6
, before tightening the terminal clamping screw.
10
mm
1
2
3 4
Figure 5
Cut to 5mm
Figure 6
Connection to Connector Terminal Block
When all wire connections are made, insure that there is a minimum clearance distance
and a minimum creepage distance in air of 0.8” (2mm) between each terminal.
For the transmitter to work properly, and to achieve maximum performance, the sensor
cable must be connected to the sensor connector as shown in the drawing below.
Note: The drawing below shows the identity of the connector terminals and
wiring connections of the cable supplied by Kahn Instruments.
SCALE 2:1
SHORT
AS POSSIBLE
1
3
2
4
BLUE
BRAID
BRAID
GREEN - 4-20 mA
(SOURCE)
SCREEN
RED
+POWER
GND
VIEW ON REAR
OF CONNECTOR
GREEN
SIGNAL (SOURCE)
GREEN
YELLOW
BLUE
RED
BLUE - SCREEN
RED + POWER
GREEN - 4-20 mA
BLUE - SCREEN
RED + POWER
GN
RD
BL
Figure 7
Wiring Connections
Always connect the 4-20 mA return signal to a suitable load
(see
Figure 7)
before the power is applied. Without this
connection, the transmitter may be damaged if allowed to
operate for prolonged periods.
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