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65-2495RK/65-2498RK
Hydrogen Sulfide Detector
Operator’s Manual
Part Number: 71-0155RK
Revision: P1
Released: 8/17/09
www.rkiinstruments.com
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Product Warranty
RKI Instruments, Inc., warrants gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year fr o m date of shipment
from RKI Instruments, Inc. Any parts found defective withi n tha t period will be repaired
or replaced, at our option, free of charge. This warranty does not apply to those items
which by their nature are subject to deterioration or consumption in normal ser v ice, and
which must be cleaned, repaired, or replaced on a routine basis. Examples of such items
are:
W arranty is voided by abuse including mechanical damage, alteration, rough handling, or
repair procedures not in accordance with the operator’s manual. This warranty indicates
the full extent of our liability , a nd we are not r esponsible for removal or r eplacement costs,
local repair costs, transportation costs, or contingent expenses incurred without our prior
approval.
a) Absorbent cartridges d) Batteries
b) Pump diaphragms and valves e) Filter elements
c) Fuses
THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY AND ALL OTHER
WARRANTIES AND REPRESENTATIONS, EXPRESSED OR IMPLIED,
AND ALL OTHER OBLIGATIONS OR LIABILITIES ON THE PART OF
RKI INSTRUMENTS, INC., INCLUDING BUT NOT LIMITED TO, THE
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL RKI INSTRUMENTS,
INC., BE LIABLE FOR INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
LOSS OR DAMAGE OF ANY KIND CONNECTED WITH THE USE OF
ITS PRODUCTS OR FAILURE OF ITS PRODUCTS TO FUNCTION OR
OPERATE PROPERLY.
This warranty covers instruments and parts sold to users by authorized distributors,
dealers, and representatives as appointed by RKI Instruments, Inc.
We do no t as su me indemnif ic a t ion for any accident or d amage caused b y t he op e r a t ion of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
65-2495RK/65-2498RK H2S Detector • 2
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Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
65-2495RK H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mounting the H2S Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Wiring the H
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Setting the Zero (Fresh Air) Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
S Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Replacing Components of the H
S Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Setting the Zero (Fresh Air) Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Response Reading (Span) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
65-2495RK/65-2498RK H2S Detector • 3
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Overview
This manual describes the 65-2498RK hydrogen sulfide (H2S) detector. This manual also
describes how to install, start up, maintain, and calibrate the H
S detector when used with
2
a gas monitoring controller. A parts list at the end of this manual lists replacement parts
and accessories for the H
S detector.
2
The 65-2498RK H
manual may also be used for the 65-2495RK H
S detector includes the 65-2495K H2S detector and a junction box. This
2
S detector which does not include a
2
junction box and is normally mounted in one of a controller’s conduit hubs. If yo u are
using a 65-2495RK H
S detector, disregard all references to the junction box and junction
2
box terminal strip.
Specifications
WARNING: Do not use this product in a manner not specified in thi s instruction
manual.
Table 1 lists specifications for the 65-2495RK and 65-2498RK H
Table 1: Specifications
Target Gas Hydrogen sulfide (H
Sampling Method Diffusion
Detection Range 0 to 100 PPM (parts per million)
Response Time 90% in 30 seconds
Accuracy ± 5% of detection range
S)
2
S detectors.
2
Operating Temperature -4°F to 113°F (-20°C to 45°C)
65-2495RK/65-2498RK H2S Detector • 4
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Description
This section describes the components of the 65-2495RK and 65-2498RK detectors. The 652498RK includes the 65-2495RK H
S detector and a junction box. A two point terminal
2
strip is provided inside the junction box for detector connections. The 65-2495RK does not
include a junction box. Figure 1 below shows the components of the 65-24 98RK.
3/4 NPT Conduit Hub
Junction Box
Rubber Spacer, 3X
HS Detector
2
Not e: The r e i s a two point
ter m inal s trip insid e t h e
junction box for detector
connections.
Figure 1: 65-2498RK Component Location
65-2495RK H2S Detector
The 65-2495RK H2S detector consists of the detector housing body, detector housing cap,
cap gasket, and the plug-in sensor.
Detector H ousing Body
Cap Gasket
H2S P lug-in Sensor
Detector
Housing Ca p
Hydrophobic
Membrane
Figure 2: 65-2495RK H
S Detector Component Location
2
65-2495RK/65-2498RK H2S Detector • 5
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Detector Housing Body
The detector housing body protects the electronic components within the housing. Use the
mounting threads at the top of the housing to screw the H
Two wires extend from the top of the detector housing body. Use these wires to connect
the detector to a controller. One of the wires is black and one of the wires is red.
The housing body includes a four-socket pattern at the bottom of the housing body. The
plug-in sensor mates to this socket pattern. A pre-amplifier located between the so ckets
and the two wires conditions the sensor’s sig na l before the signal reaches the controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the sensor and protects it
from damage. A foam gasket inside the housing cap seals against the face of the sensor
when the cap is screwed on the housing body. A hydrophobic membrane on the outside of
the cap face keeps water and particulates away from the sensor face behind the cap.
Unscrew the detector cap to access the sensor for replacement. A cap gasket seals the
interface between the housing and cap.
Plug-in Sensor
The plug-in sensor is secured in the dete ctor assembly by the housing cap. Through a
series of chemical and electrical reactions, the sensor produces an electrical output that
corresponds to the detection range of the detector.
S detector into a 3/4” NPT hub.
2
Junction Box
Installation
The junction box allows you to insta ll the H2S detector at a mounting site that is remote
from a controller and protects the dete ctor wiring connections. Two conduit hubs allow
you to mount the detector to the junction box and connect the wiring from the detector to
a controller. Three spacers installed on the back of the junction box control the distance of
the junction box from a mounting surface and insure that there is enough room to install a
calibration cup on the detector during calibration. A terminal block within the junct ion
box facilitates the wiring connections. A cover on the front of the junction box allows
access to the interior of the junction box.
This section describes procedures to mount the H2S detector in the monitoring
environment and wire the detector to a controller.
Mounting the H2S Detector
NOTE: If you are installing a 65-2495RK, it does not include a junction box and is usually
factory installed in one of a controller’s conduit hubs or may be field installed
using the 3/4” NPT threads on the end with the wir es. The 65-2498RK includes a
junction box as shown in Figure 3 below.
1. Select a mounting site that is representative of the monitoring environment. Consider
the following when you select the mounting site.
• Select a site where the detector is not likely to be bumped or disturbed. Ma ke sur e
there is sufficient room to perform start-up, maintenance, and calibration
procedures.
• Select a site where the target gas is likely to be found first.
65-2495RK/65-2498RK H2S Detector • 6
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NOTE: If your application does not require a specific mounting site, mount the detector
at approximately breathing level.
+
7.30 .25
.75
1.32
1 1/2-20 Thread for
65-2495RK
3/4" NPT
Ø 1.75
Calibration Cup
Figure 3: Outline & Mounting Dimensions, 65-2495RK & 65-2498RK
3.65
3/4 NPT
Conduit Hub
6.80 Max
Junction
1 1/2-20 Thr ead for
Calibr ation Cup
65-2498RK
Box
2.70
.75
.38
Rubber
Spacer, 3X
H S
2
Detector
2. At the mounting site you select, hang or mount the junction box with the detector
facing down (see Figure 3).
CAUTION: Mount the H2S detector with the detector facing down (see Figure 3.)
Wiring the H2S Detector to a Controller
WARNING: Always verify that power to the controller is OFF before you make wiring
connections.
1. Turn off the controller.
2. Turn off or unplug p ower to the controller.
3. If the detector is mounted remotely from a controller using the junction box, proceed
to step 4.
If the detector is mounted directly to a controller, it is normally factory wired. Confirm
that the detector’s black and red wires are connected to the appropriate controller
detector terminals and skip to “Start Up” on page 9. See Figure 4, the controller
operator’ s manual, and the controller’s detector head specification sheet for the 652495RK detector for the wiring connections.
4. Remove the junction box cover.
65-2495RK/65-2498RK H2S Detector • 7
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5. Guide a two-conductor, shielded cable or two wires in conduit through the unused
conduit hub of the junction box. Use appropriate conduit fittings and construction
technique for the environmental rating of the junction box. The junction box is rated
NEMA 4X.
6. Connect the two wires to the detector using the terminal block.
CAUTION: If using shielded cable, leave the drain wire insulated and disconne cted at the
detector. You will connect the opposite end of the cable’s drain wire at the controller.
7. Secure the junction box cover to the junction box.
8. Route the cable or wires leading from the H
S detector through one of the conduit
2
hubs at the controller housing. Use appropriate conduit fitt ings and construction
technique for the environmental rating of the controller. RKI controllers are typically
rated NEMA 4X.
CAUTION: Do not route power and detector wiring through the same conduit hub. The power
cable may disru pt the transmission of the detect or signal to the controller.
9. Connect the wires to the applicable controller terminal strip. See the controller
operator’ s manual and the controller’s detector head specification sheet for the 652498RK detector.
Controller Detector Terminals,
Typical Designations
Controller Housing
+
S
Shielded Cable
Figure 4: Wiring the H
10. If using shielded cable, connect the cable’s drain wire to an available chassis ground at
the controller. RKI controllers typically have a ground stud that is a convenient
grounding location.
11. Reinstall the junction box cover.
65-2495RK/65-2498RK H2S Detector • 8
Terminal Strip
Black
HSDetector
2
S Detector to a Controller
2
Red
Page 9
Start Up
This section describes procedures to start up the H2S detector and place the detector into
normal operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wiring to the controller is correct and secure. Refer to the
controller operator’s manual.
3. Turn on or plug in the incoming power, then turn on the controller.
4. Verify that the controller is on and operating properly. Refer to the controller
operator’s ma nual.
CAUTION: Allow the detector to warm up for 5 minutes before you continue with the next
section, “Setting t he Zero (Fresh Air) Reading”
Setting the Zero (Fresh Air) Reading
CAUTION: If you suspect the presence of H2S in the monitoring en vironment, use the
calibration kit and a zero air calibration cylinder to introduce “fresh air” to the H
detector and verify an accurate zero setting. See “Calibration” on page14 for
instructions to introduce zero air to the H2S detector.
2
S
1. Verify that the H
free of toxic and combustible gases, and of normal oxygen content, 20.9%).
2. Verify a reading of 0 p pm at the cont roller.
If the display reading is 0 ppm, start up is complete. The H
operation. If the display reading is not 0 ppm, continue with step 3.
3. Perform a zero (fresh air) adjustment operation at the controller. See the controller
operator’s manual for instructions.
S detector is in a fresh air environment (environment known to be
2
S detector is in normal
2
65-2495RK/65-2498RK H2S Detector • 9
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Maintenance
This section describes maintenance procedures. It includes preventive maintenance,
troubleshooting, and component replacement procedures.
Preventive Maintenance
This section describes a preventive maintenance schedule to ensure the optimum
performance of the H
Daily
Verify a display reading of 0 ppm at the controller. Investigate significant changes in the
display reading.
Monthly
S detector. It includes daily, monthly, and quarterly procedures.
2
This procedure describes a test to verify that the H
S detector responds properly to the
2
target gas. It describes the test using a calibration kit that includes a calibration cup,
calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
WARNING: Failure to use the recommended calibration gas flow rate will result in an
inaccurate r e ad in g.
NOTE: Performin g a response te st on the H2S detector may cause alarms. Be sure to put
the controller into its calibration program or disable external alarms before
performing this test.
Preparing for the response test
1. Place the controller into its calibration program or disable external alarms.
2. Verify that the controller display reading for the channel you are testing is 0 ppm.
If the display reading is not 0 ppm, set the zero (fresh air) reading of the detector as
described in the Start Up section of this manual, then continue this procedure.
3. Screw the regulator into the calibration cylinder. Make sure the regulator is off. It is off
when the on/off knob is turned all the way clockwise.
4. Screw the calibration cup onto the bottom of the H
S detector.
2
5. Use the sample tubing to connect the regulator to the calibration cup.
Performing the response test
1. Turn the regulator’s on/off knob counterclockwise to open the regulator. Gas will
begin to flow.
2. Allow the gas to flow for two minutes, then verify that the reading is within ± 20% of
the cylinder gas concentration.
NOTE: If the reading is not within ± 20% of the correct response reading, calibrate the
detector as described in “Calibration” on page 14.
3. Turn the regulator’s on/off knob clockwise to close the regulator.
4. Unscrew the regulator from the calibration cylind er.
65-2495RK/65-2498RK H2S Detector • 10
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5. Unscrew the calibration cup from the H2S detector. Make sure that you do not loosen
the detector housing cap when you unscrew the calibration cup.
6. When the controller display reading falls below th e alarm setpoints, return the
controller to normal operation.
Quarterly
Calibrate the H
S detector as described in “Calibration” on page 14.
2
Troubleshooting
The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the H
NOTE: This troubleshooting guide describes detector problems only. See the controller
operator’s manual for problems you may encounte r with the controller.
Fail condition
Symptoms
• The controller indicates a fail condition.
Probable causes
• The detector wiring is disconnected or misconnected.
• The plug-in sensor is not properly plugged into the four-socket pattern in the detector
housing body.
• The detector’s zero reading is low enough to cause a fail condit ion.
• The detector is malfunctioning.
Recommended action
• Verify that the detector wiring is correct and secure.
S detector.
2
• Confirm that the p lug-in sensor is installed properly.
• Perform a zero (fresh air) adjustment. A full calibration is recommended.
• If the fail condition continues, replace the plug-in sensor a s d e scribe d later in this
section.
• If the fail condition continues, contact RKI Instruments, Inc. for further instruction.
Slow or no response/difficult or unable to calibrate
Symptoms
• The detector responds slowly or doe s not respond during the monthly response test.
• Unable to accurately set the zero or response reading during the calibration
procedure.
• The detector requires frequent calibration.
NOTE: Under “normal” circumstances, the detector requires calibration once every three
months. Some applications may require a more frequent calibration schedule.See
“Calibration Frequency” on page 14 for a discussion of the calibration frequency.
65-2495RK/65-2498RK H2S Detector • 11
Page 12
Probable causes
• The plug-in sensor has been replaced and the shorting jumper has not been removed.
• The calibration cylinder is low, out-dated, or defective.
• The incorrect calibration cup or regulator is being used.
• The membrane on the detector housing cap is blocked with dirt or some other
particulate contamination.
• The detector is malfunctioning.
Recommended action
1. Confirm that the shorting jumper on the plug-in sensor pins has been removed.
2. Ver if y that the cal i brat i on cylind er con tai ns an adequate supply of a fresh te st sa mpl e.
3. Confirm that you are using the correct calibration cup and regulator. See “Parts List”
on page 16 for the required calibration cup and regulator.
4. Check the face of the detector housing cap and remove any particulate contamination
from the hydrophobic membrane if necessary. If the membrane appears saturated
with contamination or damaged, replace the membrane as described in “Replacing
the Hydrophobic Membrane” on page 13.
5. If the calibration/response difficulties continue, replace the plug-in sensor as
described later in this section.
6. If the calibration/response difficulties continue, contact RKI Instruments, Inc. for
further instruction.
Replacing Components of the H2S Detector
This section includes a procedure to replace the plug-in H2S sensor, one to replace the
hydrophobic membrane, and one to replace the entire H
cases, it is not necessary to replace the entire detector assembly.
Replacing The Plug-in H2S Sensor
CAUTION: The plug-in sensor contains electrolyte which is a dilute acid. Do not disassemble the
sensor when replacing it with a new one. If sensor electrolyte comes in contact with
your skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug p ower to the controller.
3. Unscrew the detector housing cap from the detector housing body.
4. Unplug and remove the old H
5. Remove the replacement H
S sensor.
2
S sensor from its packagi ng and remove the wire jumper
2
that is shorting the WE and RE sensor pins. This wire jumper is installed on the sensor
pins for shipment or storage but must be removed for the sensor to operate properly
when installed in a detector.
WARNING: The H2S sensor will not operate properly if the wire jumper is not removed.
S detector assembly. In most
2
65-2495RK/65-2498RK H2S Detector • 12
Page 13
6. Carefully plug the replacement sensor into the four-socket pattern that is located in
the detector housing body.
WARNING: You must replace the plug-in sensor with the same type of sensor that is
installed. A detector cannot be converted from one type of detector to
another by using a different plug-in sensor. For example, if you are
replacing an H2S sensor, you must replace it with an H2S sensor.
7. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
8. Turn on power to the controller.
9. Turn on the controller.
CAUTION: Allow the replacem ent sens or to warm up for 5 minutes before you continue with the
next step.
10. Calibrate the detector as described in “Calibration” on page 14.
Replacing the Hydrophobic Membrane
1. Turn off the controller.
2. Turn off or unplug incoming power to the controller.
3. Unscrew the detector housing cap from the detector housing body.
4. Gently pry up the edge of the white hydrophobic mem b rane with a small flat blade
screwdriver or a similar tool.
5. Peel off the hydrophobic membrane. It may be necessary to clean off the detector
housing cap face to remove any residue left from the adhesive backed membrane.
6. Install the new membrane in t he recess on the face of the detector housing cap.
7. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
8. Turn on power to the controller.
9. Turn on the controller.
Replacing the H
S Detector
2
NOTE: In most cases, it is only necessary to replace the plug-in sensor.
1. Turn off the controller.
2. Turn off or unplug incoming power to the controller.
3. If the detector is installed directly on a controller, open the controller door.
If the detector is installed remotely from a controller in a junction box, remove the
junction box cove r.
4. If the detector is installed directly on a controller, disconnect the detector leads from
the detector terminal strip in the controller. Note the position of the color-coded leads
as you remove them.
If the detector is installed remotely from a controller in a junction box, disconnect the
detector leads from the terminal block in the junction box. Note the position of the
65-2495RK/65-2498RK H2S Detector • 13
Page 14
color-coded leads as you remove them.
5. Unscrew the detector from the controller conduit hub or junction box conduit hub.
6. Gu ide the detector leads of the replacement detector through the controller conduit
hub or junction box conduit hub, then screw the mounting threads of the detector into
the hub. If necessary for environmental conditions, apply thread sealant or teflon tape
to the hub and/or detector threads to seal them.
7. If the detector is installed directly on a controller, connect the detector leads to the
appropriate detector terminal strip terminals. See Figure 4 on page 8 for wiring to a
generic controller. See the controller operator’s manual and the controller’s detector
head specification sheet for the 65-2495RK detecto r for wiring specific to your
controller.
If the detector is installed remotely from a controller in a junction box, connect the
detector leads to the terminal block the same way the old detector was wired (see
Figure 4 on page 8). See the controller operator’s manual and the controller’s detector
head specification sheet for the 65-2498RK detector to verify the connections to the
controller are correct.
8. If the detector is installed remotely from a controller in a junction box, reinstall the
junction box cove r.
9. Turn on or plug in power to the controller.
10. Turn on the controller.
CAUTION: Allow the replacement detector to warm up for 5 minutes before y o u c o ntinue with
the next step.
11. Calibrate the replacement detector as described in “Calibration” on page 14.
Calibration Frequency
Although there is no particular calibration frequency that is correct for all applications, a
calibration frequency of every 3 months is adequate for most H
Unless experience in a particular application dictates otherwise, RKI Instruments, Inc.
recommends a calibration frequency of every 3 months for the H
If an application is not very demanding, for example detection in a clean, temperature
controlled environment where H
are minimal at calibration, then a calibration frequency of every 6 months is adequate.
If an application is very demanding, for example if the environment is not well controlled
or if H
S is often present, then more frequent calibration than every 3 months may be
2
necessary.
Calibration
S detector applications.
2
S detector.
2
S is not normally present, and calibration adjustments
2
This section describes how to calibrate the H2S detector. It includes procedures to prepar e
for calibrat ion, set the fresh air re ading, set the response reading, and return to norma l
operation. It describes calibration using a calibration kit that includes a calibration cup,
calibration gas, sample tubing, and a fixed flow regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulator.
65-2495RK/65-2498RK H2S Detector • 14
Page 15
WARNING: Not using the recommended calibration cup and sample flowrate will
result in an inaccurate calibration. See“Parts List” on page 16 for the
required calibration cup and regulator.
Prepari ng for Ca libration
1. Screw the calibration cup onto the bottom of the H2S detector.
2. Screw the regulator into the zero air calibration cylinder. Make sure the regulator is
off. It is off when the on/off knob is turned all the way clockwise.
3. Use the sample tubing to connect the regulator to the calibration cup.
NOTE If you can verify that the H2S detector is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the fresh air reading.
4. Put the controller into its calibration program. See the controller operator’s manual
for instructions to enter the calibration program.
Setting the Zero (Fresh Air) Reading
1. Follow the instructions in the controller operator’s manual for setting the zero
reading.
2. When the instructions call for applying z e ro air to the detector, turn the regulator’s
on/off knob counterclockwise to open it. Gas will begin to flow.
3. Allow the gas to flow for two minutes.
4. Set the fresh air reading according to the controller operator’s manual.
5. Turn the regulator’s on/off knob clockwise to close it.
6. Unscrew the regulator from the zero air calibration cylinder. Leave the sample tubing
connected to the regulator and the calibration cup.
NOTE: Depending on the size of your zero air cylinder, it is possible that you will have a
different regulator for the zero air cylinder and the H
to fit the H2S calibration gas cylinder, change the regulator.
S gas cylinder. If necessary
2
Setting the Response Reading (Span)
1. Screw the regulator into the calibration gas cylinder. Make sure the regulator is off. It
is off when the on/off knob is turned all the way clockwise.
2. Follow the directions in the controller operator’s manual for setting the response
(span) reading.
3. When the directions call for exposing the detector to gas, turn the regulator’s on/off
knob counterclockwise to open it. Gas will begin to flow.
4. Allow the gas to flow to the detector for 2 minutes.
5. Set the response reading according to the controller operator’s manual.
6. After setting the response reading, turn the regulator’s on/off knob clockwise to turn
it off.
7. Unscrew the regulator from the cylinder.
8. Unscrew the calibration cup from the H
S detector. Make sure that you do not loosen
2
65-2495RK/65-2498RK H2S Detector • 15
Page 16
Parts List
the detector housing cap when you unscrew the calibration cup.
NOTE: For convenience, leave the regulator and calibration cup connected by the
sample tubing.
9. Allow about 45 seconds for the gas reading to decrease below the alarm points and
then return the controller to normal operation.
NOTE: If you do not allow the gas reading to decrease below the alarm points, then
unwanted alarms may occur.
10. Verify that the controller display reading decreases and stabilizes at 0 ppm.
11. Store the components of the calibration kit in a safe and convenient place.
Table 2 lists replacement parts and accesso ries for the H2S detector.
Table 2: Parts List
Part Number Description
06-1248RK-03 3 foot length of sample tubing for the calibration kit
07-0039RK Detector housing cap gasket
33-0157RK Hydrophobic membrane, adh e sive backed, for detector housing cap
65-2495RK H
71-0155RK 65-2495RK/65-2498RK H
S replacement detector assembly (inc ludes sensor)
2
S Detector Operator’s Manual (this document)
2
81-0076RK Zero air calibration cylinder, 17 liter steel
81-0076RK-01 Zero air calibration cylinder, 34 liter steel
81-0076RK-03 Z ero air calibration cylinder, 103 li te r steel
81-0151RK-02 Calibration gas cylinder, 25 ppm H
81-0151RK-04 Calibration cylinder, 25 PPM H
S in nitrogen, 58 liter aluminum
2
S in nitrogen, 34 liter aluminum
2
81-1050RK Regulator with gauge and knob, 0.5 LPM, for 17 liter and 34 liter steel
calibration cylinders
81-1051RK Regulator with gauge and knob, 0.5 LPM, for 34AL/58/103 liter cali-
bration cylinders
81-1117RK Calibration c u p
ES-1537-H2S H
65-2495RK/65-2498RK H2S Detector • 16
S replacement plug-in sensor
2
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