Page 1
65-2422RK-05
Hydrogen Sulfide Transmitter
Operator’s Manual
Part Number: 71-0114RK
Revision: B
Released: 7/18/14
www.rkiinstruments.com
Page 2
WARNING
Read and understand this instruction manual before operating
detector . Improper use of the dete ctor could result in bodily harm
or death.
Periodic calibration and maintenance of the detector is essential
for proper operation and correct readings. Please calibrate and
maintain this detector regularly! Frequency of calibration
depends upon the type of use you have and the sensor types.
T ypical calibration frequencies for most applications a re between
3 and 6 months, but can be required more often or less often
based on your usage.
65-2422RK-05 H2S Transmitter
Page 3
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 not assu m e i ndemnification fo r a ny accident or dama ge caused by the op e r a t ion of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
65-2422RK -05 H2S Transmitter
Page 4
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mounting the H2S Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring the H
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
S Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Replacing Components of the H
S Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
65-2422RK-05 H2S Transmitter
Page 5
Overview
!
This manual describes the hydrogen sulfide (H2S) transmitter. This manual also describes
how to install, start up, maintain, and calibrate the transmitter. A parts list at the end of
this manual lists replacement parts and accessories for the H
Specifications
WARNING: Do not use this product in a manner not specified in thi s instruction
manual.
S transmitter.
2
Table 1 lists specification s f or th e H
S transmitter.
2
Table 1: Specifications
Target Gas Hydrogen sulfide (H
S)
2
Area Classification Explosionproof for Class I, Groups B, C, and D
Temperature Code T6
Installation Category Installation Category 1. Signal level, special equipm ent or parts of
equipment, telecommunication, electronic, etc., with smaller
transient overvoltages than Installati on Category (Overvoltage
Category) II (ref. IEC 664).
Input Voltage 11 VDC - 30 VDC
Sampling Method Diffusion
Signal Output 4 to 20 mA
Detection Range 0 to 100 PPM (parts per million)
Accuracy ± 5% of reading or ± 2 ppm H
S Detector Signal Output 0.3 mA at 0 ppm H2S nominal
H
2
2.5 mA at 100 ppm H
S nominal
2
S (whichever is greater)
2
Response Time 90% in 30 seconds
Operating Temperature -40°F to 104°F (-40°C to 40°C)
NOTE: The following symbol on the detector label is a caution to the user to refer to this
documentation for installation and operation instructions:
WARNING: When using the 65-2422RK-05, you must follow the instructions and
warnings in this manual to assure proper and safe opera tion of the
65-2422RK-05 and to minimize the risk of personal injury. Be sure to
maintain and periodically calibrate the 65-2422RK-05 as described in this
manual.
65-2422RK-05 H2S Transmitter • 1
Page 6
Description
)
This section describes the components of the H2S transmitter. The transmitter consists of
S detector, amplifier, and junction box.
the H
2
3/4" Conduit Hub
Test P oint (-)
Factory Set
Potentiometer
Zero
Potentiometer
Span
Potentiometer
Jumper Block
Installed To Toxic
Select Header
Detector
Terminal Stri p
TP
ZERO
SPAN
OXY
TO XIC
Hydrogen Sulfide
Detector
BATT
TO XIC
RD
Interconnect
Terminal Strip
+
+
FB
4/20
24V
TP +
Test Point (+
OXY
WG
BK
Hydrogen
Sulfide
Amplifier
Securing
Screw(2)
Figure 1: H
2 • 65-2422RK-05 H2S Transmitter
S Transmitter Component Location
2
Page 7
H2S Detector
r
The H2S detector includes the detector housing body, detector housing cap, cap gasket,
rubber boot, spacer, and the plug-in H
Detector Housing Body
Cap Gasket
S sensor.
2
H2S Plug-inSensor
Spacer
Rubber Boot
Detector
Housing Cap
Flame
Arresto
Guard
Figure 2: H
S Detector Component Location
2
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
S detector into the 3/4” NPT
2
hub on the bottom of the junction box. Two wires extend from the top of the detector
housing body. Use these wires to connect the H
S detector to the amplifier. One of the
2
wires is red and one of the wires is black.
The housing includes a four-socket pattern. This socket pattern accepts the sensor’s four
pins to secure the sensor within the detector housing. A pre-amplifier, located between the
sockets and two interconnect wires, conditions the sensor’s signal before the signal
reaches the controller.
Housing Cap & Cap Gasket
The housing cap screws onto the detector housing. It retains the plug-in sensor and
protects it from damage. The housing cap also includes a flame arrestor which contains
any sparks that may occur within the detector and a flame arrestor guard which protects
the flame arrestor fro m damage. Unscrew the detector cap to access the plug-in sensor for
maintenance or replacement. A cap gasket seals the interface between the housing and
cap.
Rubber Boot and Spacer
A rubber boot and spacer are installed between the detector housing cap and the sensor.
They help ensure that the detector remains plugged into the detector housing body.
Plug-In H
The sensor is secured within the sensor housing by the four pins. Through a series of
S Sensor
2
65-2422RK-05 H2S Transmitter • 3
Page 8
chemical and electrical reactions, the sensor produces an electrical output that is
proportional to the detector range of the transmitter.
Amplifier
The amplifier converts the electrical output from the sensor to a 4 to 20 mA signal (that is
proportional to the detection range) and transmits the signal to a gas monitoring
controller. The amplifier includes the amplifier type selector, detector terminal strip,
interconnect terminal strip, span pot, zero pot, and test points (see Figure 1).
Amplifier Type Selector
The amplifier type selector is near the bottom left corner of the amplifier. It is to the left of
the detector terminal strip and below the span potentiometer.
The amplifier included with the H
S transmitter is designed for use with RKI’s toxic gas
2
and oxygen transmitters. The amplifier type selector determ ine s fo r wh ich t ransm i tte r th e
amplifier is intended. For H
S transmitters, a jumper block is installed over the TOXIC
2
selector (see Figure 1).
Detector Terminal Strip
The detector terminal strip is the four-point terminal strip near the bottom of the
amplifier. Use the detector terminal st rip to connect the H
S detector to the amplifier.
2
NOTE: The H2S detector is factory-wired to the amplifier. See the Installation section of
this manual for all wiring procedures related to the transmitter.
Interconnect Terminal Strip
The interconnect terminal strip is the four-point terminal strip near the to p of the
amplifier. Use the interconnect terminal strip to connect the amplifier to a controller.
Span Pot
The span pot is on the left side of the amplifier. Of the three potentiometers, the span pot
is bottom most. Use the span pot to adjust the transmitter’s response output during the
calibration procedure.
Zero Pot
The zero pot is above the span pot. Use the zero pot to adjust the transmitter’s target gasfree output during the start-up and calibration procedures.
CAUTION: The third potentiometer is factory-set. Do not adjust it.
Test Points
The test points (labeled TP- and TP+) are on the left and right side of the interconnect
terminal strip. The test points produce a 100 to 500 mV output that is proportional to the
transmitter’s 4 to 20 mA output. Use the test points and a voltme ter to mea sure the
transmitter’s output during the start-up and calibrat ion procedures.
Junction Box
Use the junction box to install the H2S transmitter at a mounting site that is remote from
the controller. The junction box also protects the amplifier and wiring connections made
to the amplifier. Use the two 3/4 in. conduit hubs to mount the detector to the junction
box (bottom hub) and connect wiring from the amplifier to the controller (top hub).
4 • 65-2422RK-05 H2S Transmitter
Page 9
NOTE: The H2S detector and amplifier are factory-mounted to the junction box.
)
Installation
Use the junction box’s two mounting holes to mount the H
S transmitter to a vertical
2
surface at the monitoring site. Use the cover on the front of the junction box to access the
interior of the junct ion box.
This section describes procedures to mount the H2S transmitter in the monitoring
environment and wire the transmitter to a controller.
Mounting the H2S Transmitter
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 transmitter is not likely to be bumped or disturbed. Make
sure 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.
NOTE: If your application does not require a specific mounting site, mo unt the
transmitter at approximately breathing level.
3.94
5.2
2.75
Ø .25 Mouting Holes (2X
3/4 Conduit Hub
6.1
1.1
5.46
Figure 3: Mounting the H
S Transmitter
2
8.5 max
3.2 max
65-2422RK-05 H2S Transmitter • 5
Page 10
If the H2S detector is mounted to the junction box, skip to step 5. If not, continue with
step 2.
NOTE: The H2S detector is normally provided with a Killark HKB junction b ox and an
HFC lid rated explosion proof for Class I, Groups B, C, and D. This combination
is shown in Figure 2 above. Any junction box with an internal volume less than
or equal to 69 cubic inches and rated explosion pr oof for ClassI, Gr oups B, C, and
D may be used.
2. Remove the junction box cover.
3. Guide the two wires that extend from the top of the H
S detector through the bottom
2
conduit hub of the junction box.
4. Screw the H
S detector into the bottom conduit hub of the junction box.
2
5. At the monitoring site, use #10 screws through the junction box’s two mounting holes
to secure the junction box to a vertical surface.
CAUTION: Mount the H2S transmitter with the detector facing down (see Figu re 2).
Wiring the H2S Transmitter to a Controller
WARNING: Always verify that the power source is OFF bef ore you make wiring
connections.
1. Turn off the controller.
2. Turn off or unplug incoming power at the controller.
3. Remove the junction box cover.
4. Verify that the detector leads are wired to the amplifier’s detector terminal strip.
If necessary, connect the detector leads to the detector terminal strip as shown in
Figure 3.
5. V erify that the jumper block is installed over the TOXIC selector of t he am p l ifier type
selector as shown in Figure 3.
6. Guide a two-conductor, shielded cable or two wires in conduit through the top
conduit hub of the junction box.
W ARNI NG: To maintain the explosion proof classification of the H2S detector/junction
box combination, a conduit seal must be used within 18 inches of the
junction box conduit hub used for wir ing to the controller.
7. Connect the two wires to the interconnect terminal strip as follows (see Figure 3).
• Connect the positive wire to the terminal labeled 24V +.
• Connect the feedback wire to the terminal labeled 4/20 FB.
6 • 65-2422RK-05 H2S Transmitter
Page 11
CAUTION: If using shielded cable, leave the drain wire insulated and disconne cted at the
transmitter. You will connect the opposite end of the cable’s drain wire at the
controller.
8. Secure the junction box cover to the junction box.
Factory Set Pot
Amplifier
9. Route the cable or wires leading from the H
S transmitter through one of the conduit
2
hubs at the controller housing.
CAUTION: Do not route power and transmitter wiring through the same conduit hub. The
power cable may disrupt the transmission of the tran smitter signal to t he controller.
10. Connect the wires to the to the applicable controller transmitter terminal strip as
shown in Figure 3.
Not Used
+
+
FB
OXY
24V4/20
TP +
+ 24 VDC
GWRD BK
4-20mA In (FB)
ZERO
SPAN
OXY
TOXIC
TP
BATT
TOXIC
Jumper Block
Instal led T o Toxic
Select Header
Black
11. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)
Cont ro ller or Rec ording
Device
Red
H2S Detector,
Factory Wired
Figure 4: Wiring the H
S Transmitter to a Controller
2
ground at the controller. RKI controllers typically have a ground stud that can be used
to ground the cable’s drain wire.
65-2422RK-05 H2S Transmitter • 7
Page 12
Start Up
This section describes procedures to start up the H2S transmitter and place the transmitter
into normal operation.
Introducing Incoming Power
1. Complete the installation procedures described earlier in this manual.
2. Verify that the power wi ring to the controller is correct and secure. Refer to the
controller instruction manual.
3. Turn on or plug in the incoming power at the power source end, then turn on the
controller.
4. Verify that the controller is on an d op erating properly. Refer to the controller
instruction manual.
CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the next
section, “Setting the Zero Signal”.
Setting the Zero Signal
WARNING: Do not remove the sensor cap or junction box cover while the circuits are
energized unless the area is determined to be non-hazardous. Keep the
sensor cap and junction box cover tightly closed during operation.
NOTE: If you can verify that the detector is in a fresh air environment (environment
known to be of normal oxygen content and free of toxic and combustible gases),
it is not necessary to apply zero air when verifying or setting the fresh air
reading.
The procedure below describes applying zero emission air, usually called zero air , 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.
1. Unscrew and remove the junction box cover from the junction box.
2. Set a voltmeter to measure in the millivolt (mV) range.
3. Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead
into the test point labeled TP+; plug the ne gative lead into the test point labeled TP-.
4. Screw the calibration cup onto the bottom of the detector.
5. Screw the regulator into the zero air calibration cylind er.
6. Use the sample tubing to connect the regulator to the calibration cup.
7. Turn the regulator’s on/off knob coun terclockwise to open it. Gas will begin to flow.
8. Allow the gas to fl ow for 2 minutes.
9. Verify a voltmeter reading of 100 mV (±2 mV).
10. If necessary, use a flat-blade screwdriver to adjust the span pot until the voltmeter
reading is 100 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.
8 • 65-2422RK-05 H2S Transmitter
Page 13
12. Unscrew the calibration cup from the detector.
13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave
14. Store the components of the calibration kit in a safe and conve nient place.
15. Remove the voltmeter leads from the test points.
16. Secure the junction box cover to the junction box.
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
the sample tubing connected to the regulator and the calibration cup.
S transmitter. It includes daily, monthly, and quarterly procedures.
2
Verify a display reading of 0 PPM H
S at the controller. Investigate signif icant changes in
2
the display reading.
Monthly
This procedure describes a test to verify that the H
S transmitter responds properly to
2
hydrogen sulfide. It describes the test using a calibration kit that includes a calibration
cup, calibration gas, sample tubing, and a fixed f low regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulat or.
NOTE: Performing a response te st on the H2S transmitter 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.
If the display reading is not zero, set the zero reading of the transmitter as described
in the Start Up section of this manual, then continue this procedure.
3. Screw the calibration cup onto the bottom of the H
S detector.
2
4. Screw the regulator into the calibration cylinder.
5. Use the sample tubing to connect the regulator to the calibration cup.
6. Set a voltmeter to measure in the millivolt (mV) range.
WARNING: Do not remove the sensor cap or junction box cover while the circuits are
energized unless the area is determined to be non-hazardous. Keep the
sensor cap and junction box cover tightly closed during operation.
7. Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier.
Plug the positive lead into the test point labeled TP+; plug the negative lead into the
65-2422RK-05 H2S Transmitter • 9
Page 14
test point labeled TP-.
8. Use the following formula to determine the correct test points output for the test
sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a test sample of 25 PPM H
S and a fullscale setting of
2
100 PPM, the correct output is 200 mV.
200 (mV) = (25/100) X 400 +100
Performing the response test
1. Turn the regulator on/off knob counterclockwise to open it. The sample will begin to
flow.
2. Allow the gas to flow for two min utes, then verify that the reading is within ± 20% of
the response reading you determined earlier.
NOTE: If the readings are not within ± 20% of the correct response reading, calibrate the
affected transmitter(s) as described in the Calibration section of this manual.
3. Turn the regulator on/off knob clockwise to close it.
4. Unscrew the regulator from the calibration cylinder.
5. Unscrew the calibration cup from the H
S detector.
2
6. Remove the voltmeter leads from the amplifier test points.
7. Reinstall the junction box cover.
8. When the controller display reading falls below the alarm setpoints, return the
controller to normal operation.
Quarterly
Calibrate the H
S transmitter as described in the Calibration section of this manual.
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 transmitter problems only. See the
controller instruction manual for problems you may encoun ter with the
controller.
Fail Condition
Symptoms
• The controller indicates a fail condition.
Probable causes
• The transmitter wiring is disconnecte d or misconnected.
• The transmitter’s zero reading is low enough to cause a fail condition.
• The transmitter is malfunctioning.
S transmitter.
2
10 • 65-2422RK-05 H2S Transmitter
Page 15
Recommended action
• Verify that the transmitter wiring is correct and secure.
• Calibrate the transmitter.
• If the fail condition continues, replace the H
S sensor.
2
• If the fail condition continues, contact RKI for further instruction.
Slow or No Response/Difficult or Unable to Calibrate
Symptoms
• The transmitter respon ds slowly or does not respond during the monthly response
test.
• Unable to accurately set the zero or response reading during the calibration
procedure.
• The tra nsmitte r requires frequent calibration.
NOTE: Under “normal” circumstances, the transmitter requires calibration once every
three months. Some applications may require a more frequent calibration
schedule.
Probable causes
• The calibration cylinder is low, out-dated, or defective.
• The transmitter is malfunctioning.
Recommended action
1. Verify that the calibration cylinder con t ai ns an ade qu at e suppl y of a fresh test sample.
2. If the calibration/response difficulties continue, replace the H
S sensor as described
2
later in this section.
3. If the calibrat ion/response difficulties continue, contact RKI Instruments, Inc. for
further instruction.
Replacing Components of the H2S Transmitter
This section includes procedure to replace the H2S sensor and amplifier. A procedure to
replace the entire detector assembly is at the end of this section. In most cases, it is not
necessary to replace the entire detector assembly.
Replacing the Sensor
CAUTION: The sensor contains electrolyte which is a dilute acid. Do not dis assemble the sens o r
when replacing it with a new one. If sensor electrolyte comes in co ntact with your
skin, wash affected area thoroughly with soap and water.
1. Turn off the controller.
2. Turn off or unplug incoming power at the controller.
3. Unscrew the bottom section of the H
4. Unplug and remove the H
S sensor with the rubber boot and spacer attached.
2
5. Remove the rubber boot and spacer from the old sensor.
6. Install the spacer and rubber boot onto the replacement sensor’s face.
S detector housing from the top section.
2
65-2422RK-05 H2S Transmitter • 11
Page 16
7. Carefully plug the replacement sensor into the socket pattern that is located in the top
section of the detector housing.
NOTE: Match the sensor’s male pins with the four female sockets as you plug the sensor
into the socket.
8. Screw the bottom section of the detector housing onto the top section.
9. Turn on or plug in incoming power at the power source end.
10. Turn on the controller.
CAUTION: Allow the r ep la cem ent sens or to w arm up for 5 m inu tes before you continue with the
next step.
11. Calibrate the replacement sensor as described in the Calibration section of this
manual.
Replacing the Amplifier
1. Turn off the controller.
2. Turn off or unplug incoming power at the power source end.
3. Remove the junction box cover.
4. Disconnect the detector leads from the de te ctor terminal strip.
5. Unscrew and remove the two screws that secure the amplifier to the junction box.
The screws are at the top left and bottom right of the amplifier.
6. Remove the amplifier.
7. Place the new amplifier in the same po sition as the old amplifier.
8. Use the two screws you removed in step 5 to secure the new amplifier to the junction
box.
9. V erify that the jumper block is installed over the TOXIC selector of t he am p l ifier type
selector as shown in Figure 3.
10. Reconnect the wiring from the controller to the interconnect terminal strip as shown
in Table 2 and Figure 3.
Table 2: Reconnecting the H
Amplifier
Interconnect Terminal Strip
S Amplifier to a Controller
2
Controller Transmitter
Terminal Strip (typical)
4/20 FB 4 -20 (FB)
24V + + V (11 - 30 VDC)
12 • 65-2422RK-05 H2S Transmitter
Page 17
11. Reconnect the detector leads to the detector terminal strip as shown in Table 3 and
Figure 3.
Table 3: Reconnecting the H
S Detector Lead
H
2
S Detector to the Amplifier
2
Amplifier
Interconnect Terminal Strip
Black TOXIC BK
Red TOXIC RD
12. Reinstall the junction box cover.
13. Turn on or plug in incoming power at the power source end.
14. Turn on the controller.
CAUTION: Allow the sensor to warm up for 5 minutes before you continue with the next step.
15. Calibrate the H
Replacing the H
S transmitter as described in the Calibration sectio n of this manual.
2
S Detector
2
NOTE: In most cases, it is only necessary to replace the H2S sensor.
1. Turn off the controller.
2. Turn off or unplug incoming power at the power source end.
3. Remove the junction box cover.
4. Disconnect the detector leads from the detector terminal strip. Note the position of the
color-coded leads as you remove them.
5. Unscrew the detector from the junction box.
6. Guide the detector leads of the replacement detector through the bottom conduit hub
of the junction box, then screw the mounting threads of the detector into the conduit
hub.
7. Connect the detector leads to the detector terminal strip as shown in Table 4 and
Figure 3.
Table 4: Connecting the Replacement H
S Detector Lead
H
2
S Detector to the Amplifier
2
Amplifier
Interconnect Terminal Strip
Black TOXIC BK
Red TOXIC RD
8. Reinstall the junction box cover.
9. Turn on or plug in incoming pow er at the controller.
10. Turn on the controller.
65-2422RK-05 H2S Transmitter • 13
Page 18
CAUTION: Allow the replacement detecto r to warm up for 5 minutes before you continue wit h
the next step.
11. Calibrate the replacement detector as described in the Calibration section of this
manual.
12. Secure the junction box cover to the junction box.
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, and calibration adjustments a re minima l 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,
then more frequent calibration than every 3 months may be necessary.
S transmitter applications.
2
S transmitter.
2
Calibration
This section describes how to calibrate the H2S transmitter. It includes procedures to
prepare for calibration, set the zero reading, set the response reading, and return to
normal operation. It describes th e te st using a calibration kit that includes a calibration
cup, calibration gas, sample tubing, and a fixed f low regulator with an on/off knob. RKI
Instruments, Inc. recommends using a 0.5 LPM (liters per minute) fixed flow regulat or.
Prepari ng for Ca libration
NOTE: Calibrating the H2S transmitter may cause alarms. Be sure to put the controller
into its calibration program or disable external alarms before calibration.
1. Screw the calibration cup onto the bottom of the H
2. Screw the regulator into the zero air calibration cylind er.
3. Use the sample tubing to connect the fixed flow regulator to the calibration cup.
4. Set a voltmeter to measure in the millivolt (mV) range.
WARNING: Do not remove the sensor cap or junction box cover while the circuits are
energized unless the area is determined to be non-hazardous. Keep the
sensor cap and junction box cover tightly closed during operation.
S detector.
2
5. Remove the junction box cover, then plug the voltmeter leads into the test points on
the amplifier.
Plug the positive lead into the test point labeled TP+; plug the negative lead into the
test point labeled TP-.
14 • 65-2422RK-05 H2S Transmitter
Page 19
6. Use the following formula to determ ine the correct test points output for the
calibrating sample.
Output (mV) = (calibrating sample/fullscale) X 400 + 100
For example, with a calibrating sample of 25 PPM H
100 PPM, the correct output is 200 mV.
200 (mV) = (25/100) X 400 +100
S and a fullscale set t ing of
2
Setting the Zero Reading
NOTE If you can verify that the H2S transmitter is in a fresh air environment, you do not
need to apply zero air to the detector before adjusting the zero reading.
1. Turn the regulator on/off knob counterclockwise to open it. Gas will automatically
begin to flow.
2. Allow the gas to flow for two minutes.
3. Verify a reading of 100 mV (± 2mV).
4. If necessary , use the zero pot on the amplifier to adjust the reading to 100 mV (± 2mV).
5. Unscrew the regulator from the zero air calibration cylin d er.
Leave the sample tubing connected to the regulator and the calibration cup.
Setting the Response Reading
1. Screw the regulator into the calibration cylinder. Verify that the calibration gas is
representative of the transmitter’s target gas.
2. Turn the regulator on/off knob counterclockwise to open it.
3. Allow the gas to flow for two minutes.
4. V erify that the reading matches the response reading (± 2mV) you determined earlier.
5. If necessary, use the span pot on the amplifier to adjust the reading to match the
correct response reading.
6. Turn the regulator on/off knob clockwise to close it.
7. Unscrew the regulator from the calibration cylinder.
8. Unscrew the calibration cup from the detector.
NOTE: For convenience, leave the components of the calibration kit connected by the
sample tubing.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Secure the junction box cover to the junction box.
3. When the display reading falls below the alarm setpoints, return the controller to
normal operation.
4. Verify that the controller display reading decreases and stabilizes at 0 ppm.
5. Store the components of the calibration kit in a safe and convenient place.
65-2422RK-05 H2S Transmitter • 15
Page 20
Parts List
Part Number Description
06-1248RK Sample tubing (order by the foot)
07-0033RK Detector housing cap gasket
07-0203RK Rubber retaining boot
14-2101RK Spacer between sensor and rubber boot
18-0405RK-01 Junction box (without cover; pre drilled for amplifier)
18-0406RK Junction box cover
57-1060RK Amplifier (specify target gas when ordering)
Table 5 lists replacement parts and accessories for the H2S transmitter.
Table 5: Parts List
65-2422RK-05 H
65-2423RK-05 H
71-0113RK 65-2422RK-05 H
S transmitter (includes detector and amplifier), CSA classified
2
S replacement detector assembly (i ncludes sensor), CSA classified
2
S Transmitter Operator’s Manual (this document)
2
81-0076RK-01 Zero air calibration cylinder (34 liter steel)
81-0151RK-04 Calibration cylinder (25 PPM H
S in nitrogen; 34 liter aluminum)
2
81-1050RK Regulator with gauge and knob, 0.5 LPM, for 17 liter and 34 liter steel cali-
bration cylinders
81-1051RK Regulator with gauge and knob, 0.5 LPM, for 34 liter aluminum calibration
cylinders and 58 liter and 103 liter steel calibration cylinders
81-1117RK Calibration cup
ES-1537-H2S H
S replacement sensor
2
16 • 65-2422RK-05 H2S Transmitter
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