Kahn Easidew User manual

Easidew
Dewpoint Transmitter
User’s Manual
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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 Transmitter User’s Manual
2Issue 9.1 December 2012
Contents
Safety ................................................................................................................................iii
Electrical Safety ...........................................................................................................iii
Pressure Safety............................................................................................................iii
Toxic Materials .............................................................................................................iii
Repair and Maintenance ...............................................................................................iii
Calibration...................................................................................................................iii
Safety Conformity ........................................................................................................iii
Abbreviations......................................................................................................................iv
Warnings ............................................................................................................................iv
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 ............................................................................................... 4
2.4 Electrical Schematic............................................................................................ 4
2.4.1 Electrical Boundaries ..................................................................................... 5
2.5 Transmitter Mounting.......................................................................................... 5
2.5.1 Transmitter Mounting - Sample Block (Optional).............................................. 6
2.5.2 Transmitter Mounting - Direct Pipeline Connection........................................... 7
3 OPERATION ......................................................................................................8
4 MAINTENANCE ..................................................................................................9
Figures
Figure 1 Transmitter Unpacking Method ....................................................................2
Figure 2 Connector Terminal Block Removal ..............................................................3
Figure 3 Wiring Connections.....................................................................................3
Figure 4 Connector Installation.................................................................................4
Figure 5 2-Wire Connection Diagram.........................................................................4
Figure 6 Maximum Load of Easidew - Including Cable Resistance................................5
Figure 7 Transmitter Mounting - Sensor Block............................................................6
Figure 8 Transmitter Mounting - Pipe or Duct.............................................................7
Figure 9 Installation Location ...................................................................................8
Figure 10 Indication of Dead Space ............................................................................8
Figure 11 Replacement of HDPE Guard .......................................................................9
Figure 12 Dimensions - Easidew ..............................................................................12
Appendices
Appendix A Technical Specications ............................................................................. 11
Appendix B UL Certication..........................................................................................13
Appendix C EC Declaration of Conformity...................................................................... 14

Easidew Transmitter User’s Manual
Kahn Instruments 3
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 specied safe working pressure is 5000 psig. Refer to the Technical Specications in Appendix A.

Easidew Transmitter User’s Manual
4Issue 9.1 December 2012
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
g grams
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
T temperature
V Volts
Ω Ohms
ø diameter
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 Transmitter User’s Manual
Kahn Instruments 1
INTRODUCTION
1 INTRODUCTION
The Easidew dew-point transmitter has been manufactured, tested and calibrated to the
highest available standards and should be in good working order, ready for installation
into a gas measurement application. If there are any questions about the instrument or
how to install and operate it, please contact a Kahn representative (for Kahn Instruments’
contact information go to www.kahn.com).
1.1 Features
The Easidew dew-point transmitter is a continuous on line 4-20mA transmitter for the
measurement of moisture content in air and other non-corrosive gases. The key features
are:
• 4-20 mA 2-wire loop powered connection
• Dew-point OR parts per million (moisture content) in volume (ppmV)
measurements
• Accuracy (±3.6ºFdp (±2ºCdp))
• Repeatability (0.9ºFdp (0.5ºCdp))
• Dew-point values traceable to international standards (NIST)
• Excellent sensor protection (rugged 316 stainless steel NEMA 4
construction)
• Interchangeability

Easidew Transmitter User’s Manual
2Issue 9.1 December 2012
INSTALLATION
2 INSTALLATION
2.1 Unpacking the Instrument
On delivery, please check that all the following standard components are in the packing
box:
• Easidew Transmitter
• Bonded Seal
• Certicate of Calibration
• Connector (for sensor/cable)
Unpack the dew-point transmitter box as follows:
87653 421
Figure 1 Transmitter Unpacking Method
1. Remove 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. These plastic items must be removed for the operation
of the transmitter.
NOTE: Keep the connector (2) in a safe place until the transmitter is ready
for wiring.

Easidew Transmitter 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).
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 pry it clear.

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.
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 manufactured by Kahn Instruments:
SCALE 2:1


SHORT
AS POSSIBLE

1
3
24
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 3 Wiring Connections
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.

Easidew Transmitter User’s Manual
4Issue 9.1 December 2012
INSTALLATION
2.3 Cable Connection
When installing the connector, and to insure that full ingress protection is achieved, the
retaining screw (with the O-ring and washer) must be tightened to a minimum torque
setting of 2.5 ft-lbs (3.4 Nm). The sensor cable used must be a minimum diameter of
0.2” (4.6mm).
Figure 4 Connector Installation
2.4 Electrical Schematic
NOTE: The screen/shield should be connected for maximum performance
and to avoid interference.
3
1
Max Load
250R @ 12V
500R @ 24V
Supply
12V Min
28V Max
+
Screen/
Shield
Figure 5 2-Wire Connection Diagram

Easidew Transmitter User’s Manual
Kahn Instruments 5
INSTALLATION
2.4.1 Electrical Boundaries
100
200
300
400
500
600
12 14 16 18 20 22 24 26 28
Resistance (ohms)
Supply Voltage
Figure 6 Maximum Load of Easidew - Including Cable Resistance
2.5 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 sensor before
installation (handle the transmitter by the main body only, avoiding contact with the
sensor guard).
The Easidew can be mounted into either a ow-through sensor sampling block (optional)
or directly inserted into a pipe or duct and can be operated at pressures of up to 5000
psig when installed with the bonded seal provided.
The recommended gas ow rate, when mounted in the optional sampling block, is 2 to
10 scfh (1 to 5 Nl/min). However, for direct insertion applications, gas ow can be from
static to 33 fps (10 m/sec).
NOTE: Place the bonded seal over the 5/8”- 18 UNF mounting thread and
assemble into the sampling location by hand using the wrench ats only. DO
NOT grip and twist the sensor cover when installing the sensor.
When installed, fully tighten using a wrench until the seal is fully compressed and to the
following torque setting:
5/8” - 18 UNF 22.5 ft-lbs (30.5 Nm)

Easidew Transmitter User’s Manual
6Issue 9.1 December 2012
INSTALLATION
2.5.1 Transmitter Mounting - Sample Block (Optional)
The following procedure must be carried out by a
qualied installation technician.
To mount the transmitter into the sensor block (preferred method), proceed as follows,
refer to Figure 7.
1. Insure that the protective cover (2), and its desiccant capsule (2a), have
been removed from the tip of the transmitter.
2. Install the bonded seal (4) over the threaded part of the transmitter body.
WARNING: Under no circumstances should the sensor
guard be handled with the ngers.
3. Screw the transmitter (1) into the sample block (3) and tighten to a
minimum torque setting of 22.5 ft-lbs (30.5 Nm). NOTE: Use the ats
of the hexagonal nut and not the sensor body.
4. Attach the transmitter cable/connector assembly (6) to the plug located
on the base of the transmitter and tighten the retaining screw (7) (see
Section 2.3).
Figure 7 Transmitter Mounting - Sensor Block