RKI Instruments 61-0140RK User manual

61-1000RK / 61-0140RK

Combustible Gas Detector

Operator’s Manual

Part Number: 71-0067RK

Revision: F

Released: 5/11/21

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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 applicatio ns are between
3 and 6 months, but can be required more often or less often
based on your usage.

61-1000RK/61-0140RK Combustible Gas Detector

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Product Warranty

RKI Instruments, Inc. warranties gas alarm equipment sold by us to be free from defects in
materials, workmanship, and performance for a period of one year from date of shipment
from RKI Instruments, Inc. Any parts found defective within that 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 service, and
which must be cleaned, repaired, or replaced on a routine basis. Examples of such items
are:

Warranty 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, and we are not responsible for removal or replacement costs,
local repair costs, transportation costs, or contingent expenses incurred without our prior
approval.

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.

Absorbent cartridges d) Batteries

a)
b) Pump diaphragms and valves e) Filter elements
c) Fuses

This warranty covers instruments and parts sold to users by authorized dist ri butors,
dealers, and representatives as appointed by RKI Instruments, Inc.

We do not assume indemnification for any a ccident or damage caused by the opera tion of
this gas monitor, and our warranty is limited to the replacement of parts or our complete
goods.

61-1000RK/61-0140RK Combustible Gas Detector

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Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

61-0140RK Combustible Gas Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Mounting the Combustible Gas Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Wiring the Combustible Gas Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Replacing the Combustible Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting the Zero Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

61-1000RK/61-0140RK Combustible Gas Detector

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Overview

This manual describes the 61-1000RK combustible gas detector (internal amplifier type).
This manual also describes how to install, start up, maintain, and calibrate the detector
when it is used with a gas monitoring controller. A parts list at the end of this manual
lists replacement parts and accessories for the combustible gas detector.

The 61-1000RK combustible gas detector includes the 61-0140RK combustible gas detector
and a junction box. This manual may also be used for the 61-0140RK combustible gas
detector which does not include a junction box and is normally mounted in one o f a
controller’s conduit hubs. If you are using a 61-0140RK combustible gas detector,
disregard all references to the junction box and junction box terminal strip.

Specifications

WARNING: Do not use this product in a manner not specified in this instruction

manual.

Table 1 lists specifications for the combustible gas detector.

Table 1: 61-1000RK Specifications

Target Gas Combustible gas (Methane Calibration Standard)
Area Classification Explosionproof for Class I, Groups B, C, and D
Sampling Method Diffusion
Detection Range 0 to 100% LEL
Response Time 90% in 45 seconds
Accuracy ± 5% of reading or ± 2% LEL (whichever is greater)

WARNING: When using the 61-1000RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 61-1000RK and to
minimize the risk of personal injur y. Be sure to maintain and periodically
calibrate the 61-1000RK as described in t hi s manual.

61-1000RK/61-0140RK Co mb u s ti b le G a s D e te c t or • 5

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Description

Rubber
Spacer,
3X

J-Box

Red

Green

LEL De tector

Black

White

This section describes the components of the 61-0140RK and 61-1000RK detectors. The
61-1000RK includes the 61-0140RK combustible gas detector and a junction box. A four
point terminal strip is provided inside the junction box for de tector connections. The
61-0140RK does not include a junction

box.

Figure 1: 61-1000RK Component Location

61-0140RK Combustible Gas Detector

The combustible gas detector is a catalytic type detector that produces an electrical output
that corresponds to the detection range. It is packaged in a 1/2 NPT nipple with a sintered
metal flame arrest or on one end allowing ambient air to diffuse into the detector. The
flame arrestor also con tains any spark s which may occur wit hin the detector . The 1/2 NPT
mounting threads at the top of the detector allow you to mount it into the bottom conduit
hub of the junction box. The controller conduit hubs are normally 3/4 NPT, so a 3/4 x 1/2
NPT reducer may be necessary to install the combustible gas detec tor. A rain shield screws
onto the bottom of the detector (flame arrestor end). The rainshield helps protect the
detector from rain and debris in the monitoring environment. Four color-coded leads
extend from the top of the detector. The leads allow you to connect the detector to the
terminal block.

Junction Box

The junction box allows you to install the detector at a mounting site that is remote from a
controller, and it protects the detector 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 s urface an d ensure that there is en ough roo m to instal l a
calibration cup on the detector during calibration.

The bottom conduit hub includes a 3/4 x 1/2 NPT reducer that allows you to screw the

6 • 61-1000RK/61-0140RK Combust ible Gas Detector

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Installation

J-Box

0.382.70

3/4 x 1/2NPT
Reducing Bushing

Combustible
Detector

.75

3/4 NPT

Female

3.65

7.50 max

Spacer, 3X

detector into the hub. The terminal block within the junction b ox facilitates the wiring
process. A cover on th e front of the junction box allows access to the interior of the
junction box.

This section describes procedures to mount the combustible gas detector in the
monitoring environment and wire the detector to a controller.

NOTE: The 61-0140RK detector retains its explosion proof clas sification only when

installed in the explosion proof j unction box. The detector is not explosion proof
if installed in a controller conduit hub.

Mounting the Combustible Gas Detector

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. 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. For lighter ga ses,

mount the detector near the ceiling; for heavier gases, mount the detector near the
floor.

Figure 2: Mounting the Comb ustible Gas Detector

61-1000RK/61-0140RK Co mb u s ti b le G a s D e te c t or • 7

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2. At the mounting site you select, hang or mount the junction box with the detector

facing down (see Figure 2).

Wiring the Combustible Gas Detector to a Controller

NOTE: The LEL detector is grounded through the metal-to-metal joint between the

detector and the outlex box or grounded installation during end-use.

WARNING: Always verify th at the power to the controller is off before you make

wiring connections.

1. Turn off the controller.

2. Turn off power 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 wires are connected to the appropriate controller detector terminals

d skip to “Start Up” on page 10. See Figure 3, the controller operator’s manual, and

an
the controller’s detector head specification sheet for the 61-0140RK detector for the
wiring connection s.

4. Remove the junction box cover.

5. Guide a four-conductor, shielded cable or four wires in conduit through the unused
conduit hub of the junction box. Use appropriate conduit fittings and construction
technique for the environmental rating and hazardous location classification of the

nction box. The junction box is rated NEMA 4X and classified explosion proof for

ju
Class I, Groups B, C, and D.

6. Connect the wires to the terminal block in the junction box.

CAUTION: Leave the shield drain wire insulated and disconnected 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 combustible gas detector through one of th
conduit hubs at the controller housing. Use appropriate conduit fittings 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 detector 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 sp ecif ication sheet for the
61-1000RK detector.

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 conven
grounding location.

ient

e

8 • 61-1000RK/61-0140RK Combust ible Gas Detector

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White

Black

Green

White

Red

Cont roller

LEL

Detector

Terminals

J-Bo x

Terminal Strip

Black

Detector Wires

Red

Green

Combustible
Detector

Cable Shield

Figure 3: Wiring the Combustible Gas Detector to a Controller

61-1000RK/61-0140RK Co mb u s ti b le G a s D e te c t or • 9

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Start Up

This section describes procedures to start up the combustible gas 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 power to the controller.

4. Turn on the controller.

5. Verify that the controller is on and operating properly. Refer to the contro
operator’s manual.

CAUTION: Allow the detector to warm up for 5 minutes before you continue with the next

section, “Setting the Zero Reading”.

ller

Setting the Zero Reading

WARNING: Do not remove the junction box cover while the circuits are energized

unless the area is determined to be non-hazardous. Keep the junction box
cover tightly closed during operation.

CAUTION: If you suspect the presence of combustible gas in the monitoring environment, use

the zero air calibration cylinder to introduce “fresh air” to the detector and verify an
accurate zero re a ding.

1. Verify that the detector is in a fresh air environment (environment known to be free of
combustible gas and of normal oxygen concentration, 20.9%).

2. Verify a reading of 0% LEL at the controller.
If the display reading is 0% LEL, start up is complete. The combustible detector is in

normal operation. If the display reading is not 0% LEL, continue with step 3.

3. Perform a zeroing operation at the controller. See the controller operator’s manual for
directions.

10 • 61-1000RK/61-0140RK Combus tible Gas Detector

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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 combustible gas detector. It includes daily and quarterly procedures.

Daily

Verify a display reading of 0% LEL at the controller. Investigate significant changes in the
reading.

Quarterly

Calibrate the detector as described in the Calibration section of this manual.

Troubleshooting

The troubleshooting guide describes symptoms, probable causes, and recommended
action for problems you may encounter with the combustible gas detector.

NOTE: This troubleshooting guide describes detector problems only. See the cont roller

operator’s manual for problems you may encounter with the controller.

Table 2:Troubleshooting the Combustible Gas Detector

Condition Symptom(s) Probable Causes Recommended Action

Fail Condition • Controller indicates a

Slow or No
Response/
Difficult or
Unable to
Calibrate

fail condition.

• Unable to accurately
set the zero or
response reading
during calibration.

• Detector requires
frequent calibration.

Note: Under “normal”
circumstances, the
detector requires
calibration once every
three months.

Some applications may
require a more freque nt
calibration schedule.

• The detector wiring is
disconnected or
misconnected.

• The detector zero
signal is low enough to
cause a fail condition.

• The detector is
malfunctioning.

• The calibration cylinder
is low, out-dated, or
defective.

• The calibration gas is
not an appr opriate
concentration.

• The detector is
malfunctioning.

1. Verify that the detector wiring is
correct and secure.

2. Calibrate the det ect or.

3. If the fail condition continues, replace
the detector.

4. 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. Verify that the calibration gas
concentration is appropriate for the
detector.

3. If the calibration/response difficulties
continue, replace the detector.

4. If the calibration/response difficulties
continue, contact RKI for further
instruction.

61-1000RK/61-0140RK Co m bu s ti b l e G a s D e te c to r • 11

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Replacing the Combustible Detector

1. Turn off the controller.

2. Turn off 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, disconne c t the
detector leads from the terminal block in the junction box. Note the position of the
color-coded leads as you remove them.

5. Unscrew the detector from the controller conduit hub or junction box conduit hub.

6. Guide the detector leads of the replacement detector through the controller condui
hub or junction box conduit hub, then screw the mounting threads of the detector into
the hub. If necessary for environmental conditions, apply thread sealan t 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 th
appropriate detector terminal strip terminals. See Figure 3 f or wiring to a generic
controller. See the controller operator’s manual and the controller’s detector head
specification sheet for the 61-0140RK detector 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 3). See the controller operator’s manual and the controller’s detector head
specification sheet for the 61-1000RK detector to verify the connections to
controller are correct.

8. If the detector is installed remotely from a controller in a junction box, reinstall th
junction box cove r.

9. Turn on or plug in power to the controller.

10. Turn on the controller and place into normal operation.

CAUTION: Allow the replacement detector to warm up for 5 minutes before you continue with

the next step.

11. Calibrate the replacement detector as described in the Calibration section of this
manual.

the

t

e

e

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Calibration Frequency

Although there is no particular calibration frequency that is correct for all applica tions, a
calibration frequency of every 3 to 6 months is adequate for most combustible gas detector
applications. Unless experience in a particular application dictates otherwise, RKI
Instruments, Inc. recommends a calibration frequency of every 3 months.

If an application is not very demanding, for example detection in a clean, temperature
controlled environment where combustible gas is not normally present and calibration
adjustments are minimal at calibration, then a calibration frequency o f every 6 months is
adequate.

If an application is very demanding, for example if combustible gas is present often and in
significant concentrations or the environment is not well controlled, then more frequent
calibration than every 3 months may be necessary. If potential catalyst poisons are known
or likely to be present, more frequent calibration than every 3 month s will be necessary.

Calibration

This section describes how to calibrate the combustible gas detector. It includes
procedures to prepare for calibration, set the zero reading, set the response reading, and
return to normal operation.

WARNING: The controller is not an active gas monitoring device during the calibration

procedure.

NOTE: The following procedure assumes the use of a calibration kit which includes a

calibration gas cylinder, a 0.5 LPM fixed flo w regulator with an on/off knob, a
calibration cup for the detector, and a short piece of sample tubing to connect the
regulator to the calibration cup.

Preparing for Calibration

1. Screw the calibration cup onto the bottom of the detector.

2. Screw the regulator into the calibration cylinder.

3. Use the calibration kit sample tubing to connect the regulator to the cali bration cup.

4. Place the controller into its calibration program or disable external alarms.

NOTE: Calibrating the combustible detector may cause alarms. Be sure to put the

controller into its calibration program or disable external alarms before
continuing.

61-1000RK/61-0140RK Co m bu s ti b l e G a s D e te c to r • 13

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Setting the Zero Reading

CAUTION: If you suspect the moni to r i n g en vi r o nm en t i s n o t free o f com bu stible vapors, use the

calibration kit and a zero air calibration cylinder to introduc e “fresh air” to the
detector and verify an accurate zero setting.

1. Verify that the detector is in a fresh air environment.

2. Follow the directions in the controller’s operator’s manual for setting the zero
reading.

Setting the Response Reading

1. Follow the directions in the controller’s operator’s manual for setting the response
reading (span).

2. When the directions call for exposing the detector to gas, turn the regula tor’s on/off
knob counterclockwise to open it.

3. Allow the gas to flow for one minute before continuing with th e directions.

4. After setting the response reading, turn the regulator’s on/off knob clockwise to cl
it.

5. Unscrew the regulator from the cylinder.

ose

Returning to Normal Operation

1. Unscrew the calibration cup from the detector.

NOTE: For convenience, leave regulator and calibration cup connected by the sample

tubing.

2. When the controller display reading falls below the alarm points, return the controller
to normal o peration.

NOTE: If you do not allow the gas reading to decrease below the alarm points, then

unwanted alarms may occur.

3. Verify that the controller display reading d ecreases a nd stabilizes at 0 %LEL.

4. Store the components of the calibration kit in a safe and convenient place.

14 • 61-1000RK/61-0140RK Combus tible Gas Detector

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Parts List

Table 3 lists replacement part s and access ories for the 61 -1000RK combu stible gas detect or.

Table 3: Parts List

Part Number Description

18-0400RK-01 Junction box with spacers
61-0140RK Replacement combustible gas detector
71-0067RK 61-1000RK Combustible Gas Detector Operator’s Manual (this document)
81-0002RK-01 Calibration cylinder, 50% LEL hydrogen in air, 34 liter steel
81-0002RK-03 Calibration cylinder, 50% LEL hydrogen in air, 103 liter
81-0004RK-01 Calibration cylinder, 50% LEL propane in air, 34 liter steel
81-0004RK-03 Calibration cylinder, 50% LEL propane in air, 103 liter
81-0007RK-01 Calibration cylinder, 15% LEL hexane in air, 34 liter steel
81-0012RK-01 Calibration cylin der, 50% LEL metha ne in air, 34 liter st eel
81-0012RK-03 Calibration cylinder, 50% LEL methane in air, 103 liter
81-0076RK-01 Zero air calibration cylinder, 34 liter steel
81-0076RK-03 Zero air calibration cylinder, 103 liter
81-1050RK Regulator, wit h ga uge and kno b, 0. 5 liter/ minute conti nuous f low, for 17 l iter an d 34

liter steel calibration cylinders (cylinders with external threads)

81-1051RK Regulator, wit h ga uge and knob, 0.5 liter/minute continuous flow, for 34 lit er alumi-

num/58 liter/103 liter calibration cylinders (cylinders with internal threads)

81-1117RK Calibration cup

61-1000RK/61-0140RK Co m bu s ti b l e G a s D e te c to r • 15

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