RKI Instruments 65-2451RK Bedienungsanleitung

65-2451RK

Hydrogen Transmitter

Operator’s Manual

Part Number: 71-0133RK

Revision: C

Released: 5/17/11

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65-2451RK Hydrogen Transmitter

WARNING

Read and understand this instruction manual before

operating transmitter. Improper use of the transmitter could

result in bodily harm or death.

Periodic calibration and maintenance of the transmitter is

essential for proper operation and correct readings. Please

calibrate and maintain this transmitter regularly! Frequency

of calibration depends upon the type of use you have and

the sensor types. Typical calibration frequencies for most

applications are between 3 and 6 months, but can be

required more often or less often based on your usage.

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65-2451RK Hydrogen Transmitter

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 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.

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 indemnification for any accident or damage caused by the operation of

this gas monitor, and our warranty is limited to the replacement of parts or our complete

goods.

a) Absorbent cartridges d) Batteries

b) Pump diaphragms and valves e) Filter elements

c) Fuses

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65-2451RK Hydrogen Transmitter

Table of Contents

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Hydrogen Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Mounting the Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Wiring the Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Replacing Components of the Hydrogen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

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

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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

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

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

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65-2451RK Hydrogen Transmitter • 1

Overview

This manual describes the 65-2451RK hydrogen transmitter. This manual also describes

how to install, start up, configure, maintain, and calibrate the transmitter 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 hydrogen transmitter.

Specifications

Table 1 lists specifications for the hydrogen transmitter.

WARNING: When using the 65-2451RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2451RK and to

minimize the risk of personal injury. Be sure to maintain and periodically

calibrate the 65-2451RK as described in this manual.

Table 1:Specifications

Description Specification

Target Gas Hydrogen

Area Classification Explosionproof for Class I, Groups B, C, and D

Sampling Method Diffusion

Signal Output 4 to 20 mA

Detection Range 0 to 100% LEL

Response Time 90% in 45 seconds

Accuracy ± 5% of reading or ± 2% LEL (whichever is greater)

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2 • 65-2451RK Hydrogen Transmitter

Description

This section describes the components of the hydrogen transmitter. The transmitter is a 4 -

20 mA type detector head. It consists of the hydrogen detector, amplifier, and junction

box.

Figure 1: Hydrogen Transmitter Component Location

Hydrogen Detector

The hydrogen detector is a catalytic type detector that produces an electrical output that

corresponds to the detection range. It is packaged in a 1/2 inch NPT nipple with a sintered

metal flame arrestor on one end allowing ambient air to diffuse into the detector. The

flame arrestor also contains any sparks which may occur within the detector. The detector

has a built in molecular sieve that only allows hydrogen to diffuse into the detector. The

1/2 inch NPT mounting threads at the top of the detector allow you to mount it into the

bottom conduit hub of the junction box. A rainshield 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 amplifier.

LEL

Controller Terminal Strip

Amplifier

Mounting Screw

GWR PWR / SIG

Detector (sensor)Current

Label

J-Box

Detector Terminal Strip

Zero Pot

Span Pot

Factory Adjust Pot

Jumper Pins,

Factory Use Only

Red + Test Point

Hydrogen

Detector

Sensor

Current

Reducing Bushing,

3/4 NPT to 1/2 NPT

Black - Test Point

SPAN

ZERO

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65-2451RK Hydrogen Transmitter • 3

Amplifier

The amplifier converts the electrical output from the detector 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. A label on the amplifier indicates the detector drive current. This

drive current is factory set and is dictated by the combustible gas to which the detector is

calibrated. Consult RKI Instruments, Inc. if you plan to change the calibration gas for the

transmitter, for example from a hydrogen calibration to a methane calibration. The

amplifier includes the detector terminal strip, controller terminal strip, span pot, zero pot,

and test points (see Figure 1).

Controller Terminal Strip

The controller terminal strip is a three position plug-in style terminal strip located near the

top of the amplifier. Use the controller terminal strip to wire the transmitter to a controller.

Detector Terminal Strip

The detector terminal strip is a four position plug-in style terminal strip located below the

controller terminal strip. Use the detector terminal strip to connect the detector to the

amplifier.

NOTE: The detector is factory-wired to the detector terminal strip. See “Wiring the

Hydrogen Transmitter to a Controller” on page 5 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 the amplifier’s

zero (fresh air) output during the start-up and calibration procedures. Turn the adjust-

ment 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 and adjust the amplifier’s gas

response output during the calibration procedure. Turn the adjustment screw clockwise to

increase the zero output and counterclockwise to decrease the zero output.

CAUTION: The amplifier includes two additional potentiometers. They are factory-set. Do not

adjust them.

Test Points

The test points are on the left side of the amplifier (see Figure 1). The test points produce a

100 mV 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 amplifier’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 on is the positive (+) test point.

Junction Box

Use the junction box to install the 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 inch conduit hub to connect wiring from the amplifier to the

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4 • 65-2451RK Hydrogen Transmitter

controller. Use the cover on the front of the junction box to access the interior of the

junction box. The detector and amplifier are factory installed in the junction box. Three

spacers installed on the back 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.

Installation

This section describes procedures to mount the hydrogen transmitter in the monitoring

environment and wire the transmitter to a controller.

Mounting the Hydrogen 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. For hydrogen, which is

lighter than air, mount the transmitter near the ceiling or where hydrogen is most

likely to accumulate.

Figure 2: Mounting the Hydrogen Transmitter

Rubber

Spacers,

.75

2.70 .38

3.65

3/4 NPT Female

J Box

3/4 x 1/2 Reducing

Bushing

Hydrogen

Detector

7.5 max

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65-2451RK Hydrogen Transmitter • 5

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

facing down (see Figure 2).

Wiring the Hydrogen Transmitter to a Controller

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

wiring connections.

1. Turn off power to the controller.

2. Place the controller’s power switch in the OFF position.

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 3.

5. To gain access to a plug-in terminal strip for wiring, pull it out of its socket by

grasping the terminal strip and pulling. The detector strip is keyed so that the

controller and detector terminal strips cannot be reversed inadvertently.

6. Guide a three-conductor, shielded cable or three wires in conduit through the top

conduit hub of the junction box.

7. Pull out the controller terminal strip, and connect the three wires to the terminal strip

as follows (see Figure 3).

• Connect the positive wire to the PWR/SIG “+” terminal.

• Connect the signal wire to the PWR/SIG “S” terminal.

• Connect the negative wire to the PWR/SIG “-” terminal.

CAUTION: If shielded cable is used, leave the cable shield’s drain wire disconnected and

insulated 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 wires leading from the hydrogen transmitter through one of the

conduit hubs at the controller housing.

CAUTION: Do not route power and transmitter wiring through the same controller conduit hub.

The power cable may disrupt the transmission of the transmitter signal to the

controller.

11. Connect the wires to the applicable detector/transmitter terminal strip at the

controller as shown in Figure 3.

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6 • 65-2451RK Hydrogen Transmitter

Figure 3: Wiring the Hydrogen Transmitter to a Controller

12. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth)

ground at the controller.

Controller or

Recording Device

+ 24 VDC

Amplifier

Black

Red

Cable Shield

- (DC Ground)

4 - 20 mA In (S)

PWR / SI G

SR W G B

Green Detector Wires

White

LEL

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