Page 1
Hydrogen Sulfide Transmitter
Part Number: 71-0176RK
Revision: A
Released: 7/18/14
65-2331RK
Operator’s Manual
RKI Instruments, Inc.
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.
65-2331RK 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 RK I 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 assume i ndemnification for any accident or dama g e ca u s e d by the operation of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.
65-2331RK H2S Transmitter
Page 4
Table of Contents
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
H2S Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Mounting the H2S Transm itter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Wiring the H
Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
S Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Replacing Components of the H
S Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2
Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
65-2331RK H2S Transmitter
Page 5
Overview
!
This manual describes the 65-2331RK explosion-proof hydr ogen 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
transmitter.
Specifications
WARN IN G: Do not use this product in a manner not specified in thi s instruction
manual.
S
2
Table 1 lists specifications for the H
S transmitter.
2
Table 1: Specifications
Target Gas Hydrogen sulfide (H
S)
2
Area Classification Explosion-proof 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 :
W ARNING: When using the 65-2331RK, you must follow the instructions and warnings
in this manual to assure proper and safe operation of the 65-2331RK and to
minimize the risk of personal injury. Be sure to maintain and period ically
calibrate the 65-2331RK as described in t hi s manual.
65-2331RK H2S Transmitter • 1
Page 6
Description
F
This section describes the components of the H2S transmitter. The transmitter consists of
S detector, amplifier, and junction box.
the H
2
actory Adjust Pot
Controller Terminal Strip
Span Pot
Zero Pot
S
ZERO
SPAN
SIG/PWR
TOXI C OXY
Amplifier
+ Test Point (Red)
Detector Terminal Strip
- Test Point (Black)
J-Box
Figure 1: H
2 • 65-2331RK H2S Transmitter
H2S Detector
S Transmitter Component Location
2
Page 7
H2S Detector
r
The H2S detector consists of the detector housing body, detector housing cap, cap gasket,
rubber boot, spacer, and the plug-in sensor.
Detector Housing Body
Cap Gasket
H2S Plug-in Sensor
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 H2S detector into the 3/4” NPT
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 ho using cap and the sensor.
They help ensure that the detector remains plugged into the detector housing body.
65-2331RK H2S Transmitter • 3
Page 8
Plug-In H2S Sensor
The sensor is secured within the detector 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 transmitter.
Amplifier
The amplifier converts the electrical output from the sensor to a 4 to 20 mA signal that
corresponds to the detection range and transmits the signal to a gas monitoring controller .
A foam gasket that orients the amplifier and keeps it from rotating is installed on the
bottom of the amplifier. The amplifier includes the controller terminal strip, detector
terminal strip, zero pot, span pot, and test points (Figure 1).
Controller Terminal Strip
The interconnect terminal strip is a two position plug-in style terminal strip located at the
top edge of the amplifier. Use the controller terminal strip to connect the amplifier to a
controller.
Detector Terminal Strip
The detector terminal strip is a four-point plug-in style terminal strip near the bottom of
the amplifier. U se the detector terminal strip to connect the H
S detector to the amplifier.
2
NOTE: The H2S detector is factory-wired to the detector terminal strip. See the
Installation section of this man ual for all wiring procedures related to the
transmitter.
Zero Pot
The zero pot is located in the upper left corner of the amplifier (see Figure 1). Use a small
flat blade screwdriver to turn the zero pot’s adjustment screw and adjust th e amplifier’s
zero (H
S free) output during the start-up and calibration procedures. Turn the
2
adjustment screw clockwise to increase the zero output and counterclockwise to decrease
the zero output.
Span Pot
The span pot is located to the right of the zero pot (see Figure 1). Use a small flat blade
screwdriver to turn the span pot’s adjustment screw an d adjust the amplifier’s response
output during the calibration procedure. Turn the adjustment screw clockwise to increase
the output and counterclockwise to decrease the output.
CAUTION: The third potentiometer is factory-set. Do not adjust it.
Test Points
The test points (red and black) are on the left side of the amplifier (see Figure 1). The test
points produce a 100mV to 500 mV output that corresponds to the transmitter’s 4 to 20
mA output. Use the test points and a voltmeter to measure the transmitter’s output
during the start-up and calibration procedures. The black test point in the lower left
corner is the negative (-) test point and the red test point below the zero pot is the positive
(+) test point.
4 • 65-2331RK H2S Transmitter
Page 9
Installation
Junction Box
Use the junction box to install the H2S transmitter at a mounting site that is remote from
the controller. The junction box protects the amplifier and wiring connections made to the
amplifier. Use the top 3/4’’ conduit hub to connect wiring from the amplifier to the
controller. Use the cover on the front of the junction box to access the interior of the
junction b ox. Th ree spac ers in stall ed on t he ba ck of the junction box control the distance of
the junction box from a mounting surface and ensure that there is enough room to install a
calibration cup on the detector during calibration.
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 that is at normal breathing level.
65-2331RK H2S Transmitter • 5
Page 10
3/4 NPT
Fem ale
3.65
8.18 Max
3.10
.75
.38
Rubber
Spacers
3X
J-Box
H2S Detector
1 1/ 2- 20 Thread for
Calibration Cup
Figure 3: Mounting the H2S Transmitter
2. At the monitoring site you select, hang or mount th e jun c tion box with the detector
facing down (see Figure 3).
6 • 65-2331RK H2S Transmitter
Page 11
Wiring the H2S Transmitter to a Controller
WARN ING: Always verify that power t o the controller is OFF before you make wiring
connections.
1. Turn off the controller.
2. Turn off power to the controller.
3. Remove the junction box cover.
4. The detector leads are factory wired. Verify that the detector leads are wired to the
amplifier’s detector terminal strip as shown in Figure 4.
5. To gain access to a plug-in terminal strip for wiring, pull it out of its sock et by
grasping the terminal strip and pulling. The detector terminal strip is keyed so that
the controller and detector terminal strips cannot be reversed in advertently.
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.
6. Guide a two-conductor, shielded cable, or two wires in conduit through the top
conduit hub of the junction box.
7. Pull out the controller terminal strip and connect the two wires to the terminal strip as
follows (see Figure 4).
• Connect the positive wire to the terminal labeled SIG/PWR “+” terminal.
• Connect the signal wire to the terminal labeled SIG/PWR “S” terminal.
CAUTION: If shielded cable is used, leave the cable shield’s drain wire insulated and
disconnected at the transmitter. You will connect the opposite end of the cable’s drain
wire to the controller’s chassis (earth) ground.
8. Reinstall the controller terminal strip into its socket.
9. Secure the junction box cover to the junction box.
10. Route the cable or w ires 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 controller conduit hub.
The power cabl e may disrupt the transmission o f the transmitte r signal to the
controller.
65-2331RK H2S Transmitter • 7
Page 12
11. Connect the wires to the applicable detector/transmitter terminal strip at the
controller as shown in Figure 4.
Controller Detector/Transmitter
Terminals, Typical Designations
Controller
S
+
H2S Detector
J-Box
Cable Shield
ZERO
SPAN
S
SI G/ P WR
TOXIC OXY
Black
Red
Figure 4: Wiring the H
12. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)
ground at the controller. RKI controllers typically have a ground stud that can be used
to ground the cable’s drain wire.
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 wiring to the controller is correct and secure. Refer to the
controller operator’s manual.
8 • 65-2331RK H2S Transmitter
S Tran smitter to a Controller
2
Page 13
3. Turn on pow er to the controller.
4. Turn on the controller.
5. Verify that the controller is on and operating properly. Refer to the controller
operator’s ma nual.
CAUTION: Allow the transmitter to warm up for 5 minutes before you continue with the ne xt
section, “Setting the Zero Signal”.
Setting the Zero Signal
WARN ING: Do not remove the detector housing cap or junction bo x cover while the
circuits are energized unless the area is determined to be non-hazardous.
Keep the detector housing 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 red (+) test point; plug the negative lead into the black (-) test point.
4. Screw the calibration cup onto the bottom of the H
S detector.
2
5. Screw the regulator into the zero air calibration cylinder.
6. Use the sample tubing to connect the regulator to the calibration cup.
7. Turn the regulator’s on/off knob counterclockwise to open it. Gas will begin to flow.
8. Allow the gas to flow for two minutes.
9. Verify a voltmeter reading of 100 mV (±2 mV).
10. If necessary, use a small flat-blade screwdriver to adjust the zero pot until the
voltmeter reading is 100 mV (±2 mV).
11. Turn the regulator’s on/off knob clockwise to close it.
12. Unscrew the calibration cup from the detector.
13. U nscrew the regulator from the zero air calibration cylinder. For convenience, leave
the sample tubing connected to the regulator and the calibration cup.
14. Store the components of the calibration kit in a sa fe and convenient place.
15. Remove the voltmeter leads from the test points.
16. Secure the junction box cover to the junc tion box.
65-2331RK H2S Transmitter • 9
Page 14
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
S transmitter. It includes daily, monthly, and quarterly procedures.
2
Verify a display reading of 0 ppm H
S at the controller. Investigate significant 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 flow regulator with an on/off knob.
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 ppm.
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.
WARN ING: Do not remove the detector housing cap or junction bo x cover while the
circuits are energized unless the area is determined to be non-hazardous.
Keep the detector housing cap and junction box cover tightly closed during
operation.
3. Unscrew and remove the junction box cover.
4. Set a voltmeter to read in the millivolt (mV) range.
5. Plug the voltmeter leads into the test points on the amplifier. Plug the positive lead
into the red (+) test point; plug the negative lead into the black (-) test point.
6. 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
100 PPM, the correct output is 200 mV.
7. Screw the regulator into the calibration cylinder.
8. Use the sample tubing to connect the regulator to the calibration cup.
10 • 65-2331RK H2S Transmitter
S and a fullscale setting of
2
200 (mV) = (25/100) X 400 +100
Page 15
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 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” on page15.
3. Turn the regulator’s on/off knob clockwise to close the regulator.
4. Unscrew the regulator from the calibration cylind er.
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 th e alarm setpoints, return the
controller to normal operation.
9. Store the components of the calibration kit in a safe place.
Quarterly
Calibrate the H
S transmitter as described in “Calibration” on page 15. See the calibration
2
frequency discussion in “Calibration Frequency” on page 14 to determine if a quarterly
calibration schedule fits your needs.
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 operator’s manual for problems you may encounter with the
controller.
S transmitter.
2
65-2331RK H2S Transmitter • 11
Page 16
Table 2: Troubleshooting H2S Transmitter
Condition Symptom(s) Probable Causes Recommended Action
Fail Condition • Controller indicates a
Slow or No
Response/
Difficult or
Unable to
Calibrate
fail condition.
• Transmitter responds
slowly or does not
respond to response
test.
• Unable to accurately
set the zero or
response reading
during calibration.
• Transmitter requires
frequent calibration.
Note: Under “normal”
circumstances, the
transmitter requires
calibration once every 3
months.
Some applications
may require a more
frequent calibration
schedule.
• The transmitter wiring
to the controller is
disconnected or
misconnected.
• The plug-in sensor is
not properly plugged
into the sockets in the
detector housing body.
• The wiring from the
detector to the
amplifier is
disconnected or
misconnected.
• The transmitter’s zero
reading is low enough
to cause a fail
condition.
• The transmitter is
malfunctioning.
• The calibration cylinder
is low, out-dated, or
defective.
• The flame arrestor in
the detector housing
cap is wet or clogged
with dirt or other
particulates.
• The calibration gas is
not an appr opriate
concentration.
• The transmitter is
malfunctioning.
1. V erify that the transmitter wiring to the
controller is correct and secure.
2. Confirm that the plug-in sensor is
installed properl y.
3. V erify that the wiring f rom the detect or
to the amplifier is correct and secure.
4. Perform a fresh air adjustment. A full
calibration is recommended.
5. If the fail condition continues, replace
the plug-in sensor as described later
in this section.
6. If the fail condition continues, contact
RKI for further instruction.
1. Verify that the calibration cylinder
contains an adequate supply of a
fresh test sample.
2. Check the detector housing cap to
determine if the flame arrestor is wet
or dirty. Clean if necessary.
3. Verify that the calibration gas
concentration is appropriate for the
transmitter. Zero emission air (20.9%
oxygen) is normally used for a zero
adjustment if the environment is
suspect and 25 PPM H
is normally used for a response test.
4. If the calibration/response difficulties
continue, replace the plug-in sensor
as described later in this section.
5. If the calibration/response difficulties
continue, contact RKI for further
instruction.
S in nitrogen
2
Replacing Components of the H2S Transmitter
This section includes a procedure to replace the H2S plug-in 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 Plug-In H
CAUTION: The sensor contains el ectr o lyt e whi ch is a dil ute ac id. Do not disass em ble th e sens or
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 power to the controller.
12 • 65-2331RK H2S Transmitter
S Sensor
2
Page 17
3. Unscrew the detector housing cap from the detector housing body. Make sure not to
lose the cap gasket.
4. Unplug an d 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.
7. Carefully plug the replacement sensor into the four-socket pattern that is located in
the detector housing.
8. Make sure the cap gasket is in place and screw the detector housing cap back onto the
detector housing body.
9. Turn on or plug in power to the controller.
10. Turn on the controller and place into normal operation.
CAUTION: Allow th e 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 transm itter as described in the “Calibration” on page 1 5.
Replacing the H
S Detector
2
NOTE: In most cases, it is only necessary to replace the plug-in H2S sensor.
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. Remove the detector terminal strip from its socket.
5. Disconnect the detector leads from the detector terminal strip. Note the position of the
color-coded leads as you remove them.
6. Unscrew the detector from the junction box conduit hub.
7. 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. If necessary for environmental conditions, apply thread sealant or teflon tape to
the hub and/or detector threads to seal them.
8. Connect the detector leads to the appropriate detector terminal strip terminals.
Connect the red wire to the terminal labeled TOXIC + and the black wire to the
terminal labeled TOXIC -. See Figure 4 for the detector wiring connections to the
amplifier.
9. Reinstall the detector terminal strip into its socket.
10. Reinstall the junction box cover.
11. Turn on or plug in power to the controlle r.
12. Turn on the controller and place it into normal operation.
CAUTION: Allow the replacement detector to warm up for 5 minutes before you cont in ue with
the next step.
13. Calibrate the replacement detector as described in “Calibration” on page 15.
65-2331RK H2S Transmitter • 13
Page 18
Replacing the Amplifier
1. Turn off the controller.
2. Turn off or unplug power to the controller.
3. Remove the junction box cover.
4. Unplug the detector terminal strip and controller terminal strip from their sockets.
You may leave the wires connected to the terminal strips.
5. Unscrew and remove the screw with the flat and lock washers that secures the
amplifier to the junction box. The screw is at the bottom right of the amplifier.
6. Remove the old amplifier.
7. Place the new amplifier in the same position as the old amplifier. A foam gasket that
orients the amplifier and keeps it from rotating is installed on the bottom of the
amplifier. Make sure the amplifier is seated flat in the junction box.
8. Install the new amplifier in to the junction box with the screw, lock washer, and flat
washer you removed in Step 5.
9. Install the detector and controller terminals strips into their sockets on the new
amplifier as shown in Figure 4. If controller leads or detector leads were removed
during this procedure, refer to Figure 4 for the detector and amplifier connecti ons.
NOTE: When a transmitter is first powered up with a new amplifier, the initial output
may be either high or below zero depending on the setting of the zero pot. Be
sure to make arrangements so that this does not cause unwanted alarms.
10. Turn on or plug in power to the controller.
11. Turn on the controller and place it into normal operation.
12. Allow the transmitter to warm up for 5 minutes.
13. Calibrate the H
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 fo r 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 the 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 as described in t he “Calibration” on page 15.
2
S transmitter applications.
2
S transmitter.
2
14 • 65-2331RK H2S Transmitter
Page 19
Calibration
This section describes how to calibrate the H2S transmitter. It includes procedures to
prepare for calibration, set the zero reading, set the response rea d ing, 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.
WARN ING: Do not remove the detector housing cap or junction bo x cover while the
circuits are energized unless the area is determined to be non-hazardous.
Keep the detector housing cap and junction box cover tightly closed during
operation.
1. Unscrew and remove the junction box cover.
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 red (+) test point; plug the negative lead into the black (-) test point.
4. Use the following formula to determine 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
5. Screw the calibration cup onto the detector housing.
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. Screw the regulator into the zero air calibration cylinder.
2. Use the sample tubing to connect the regulator to the calibration cup.
3. Turn the regulator knob counterclockwise to open the regulator.
4. Allow the gas to flow for two minutes, then verify a reading of 100 mV (± 2mV). 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 cylinder.
6. 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.
65-2331RK H2S Transmitter • 15
Page 20
2. Turn the regulator knob counterclockwise to open the regulator.
3. Allow the gas to flow for two minutes, then verify that the reading matches the
response reading (± 2mV) you determined earlier. If necessary, use the span pot on the
amplifier to adjust the reading to match the correct response reading.
4. Turn the regulator knob clockwise to close the regulator.
5. Unscrew the regulator from the calibration cylind er.
Returning to Normal Operation
1. Remove the voltmeter leads from the amplifier test points.
2. Unscrew the calibration cup from the detector.
NOTE: For convenience, leave the components of the calibration kit connected by the
sample tubing.
3. Secure the junction box cover to the junction box.
4. When the display reading falls below the ala r m setpoints, return the controller to
normal operation.
5. Verify that the controller display reading decreases and stabilizes at 0 ppm.
6. Store the components of the calibration kit in a safe and convenient place.
16 • 65-2331RK H2S Transmitter
Page 21
Parts List
Table 5 lists replacement parts and accessories for the H2S transmitter.
Table 3: 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
18-0400RK-01 Junction box with rubber spacers
57-1064RK-03 Amplifier (specify target gas when ordering)
65-2331RK H
65-2423RK-05 H
71-0176RK 65-2331RK H
S transmitter (includes detector and amplifier), CSA classified
2
S replacement detector assembly (includes 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 Regul ator with g auge a nd kno b, 0.5 LPM, f or 17 lite r and 34 l iter s teel
calibration cylinders
81-1051RK Regulator with gauge and knob, 0.5 LPM, for 34AL/58/103 liter
calibration cylinders
81-1117RK Calibration cup
ES-1537-H2S H
S replacement sensor
2
65-2331RK H2S Transmitter • 17
Loading...