RKI Instruments 65-2400RK Manuale utente

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65-2400RK

Combustible Gas Transmitter

Operator’s Manual

Part Number: 71-0060RK

Revision: C

Released: 1/31/13

65-2400RK Combustible Gas Transmitter

WARNING

Read and understand this instruction manual before operating

detector. Improper use of the detector 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.

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.

65-2400RK Combustible Gas 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

65-2400RK Combustible Gas Transmitter

Table of Contents

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

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

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

Combustible Gas Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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

Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Mounting the Combustible Gas Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Wiring the Combustible Gas Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

Replacing Components of the Combustible Gas Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

65-2400RK Combustible Gas Transmitter • 1

Overview

This manual describes the 65-2400RK combustible gas 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 combustible gas transmitter.

Specifications

Table 1 lists specifications for the combustible gas transmitter.

WARNING: When using the 65-2400RK, you must follow the instructions and warnings

in this manual to assure proper and safe operation of the 65-2400RK and to

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

calibrate the 65-2400RK as described in this manual.

Table 1:Specifications

Description Specification

Target Gas Combustible gas

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

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

Response Time 90% in 45 seconds

2 • 65-2400RK Combustible Gas Transmitter

Description

This section describes the components of the combustible gas transmitter. The transmitter

is a 4 - 20 mA type detector head. It consists of the combustible gas detector, amplifier, and

junction box.

Figure 1: Combustible Gas Transmitter Component Location

Combustible Gas Detector

The combustible gas detector includes the sensing elements, flame arrestor, detector

housing, and detector leads.

Sensing Elements

Two sensing elements are protected within the detector assembly. Through a series of

thermal and electronic reactions, these elements produce an electrical output that is

proportional to the detection range of the transmitter.

Flame Arrestor

The porous flame arrestor allows the target gas to diffuse into the detector assembly and

contact the sensing elements. The flame arrestor also contains sparks within the detector.

GND

24V

4-20

RED

WHT

GRN

BLK

SENSOR POWER/SIG

TP+

TP-

Combustible gas

amplifier

Interconnect

terminal strip

Test point (-)

Securing screw (2)

Test point (+)

Reducer

(3/4 in. x 1/2 in.)

Combustible gas

detector

Zero potentiometer

Span potentiometer

Potentiometer

(factory set)

Potentiometer

(factory set)

Jumper pins

(factory use only)

65-2400RK Combustible Gas Transmitter • 3

Detector Housing

The sensing elements and flame arrestor are installed within the detector housing.

Mounting threads (1/2 in. NPT) at the top of the detector allow you to mount the

combustible gas detector into the bottom conduit hub of the junction box. A rainshield

screws onto the bottom of the detector. The rainshield helps protect the detector from

debris in the monitoring environment.

Detector Leads

Four color-coded leads extend from the top of the detector. The leads allow you to connect

the combustible gas detector to the amplifier.

Amplifier

The amplifier converts the electrical output from the detector 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 interconnect terminal strip, span pot, zero pot, and test points

(see Figure 1).

Interconnect Terminal Strip

The interconnect terminal strip is a seven-point terminal strip. Use the interconnect

terminal strip to connect the combustible gas detector to the amplifier and the amplifier to

a controller.

NOTE: The combustible gas detector is factory-wired to the amplifier. See the

Installation section of this manual for all wiring procedures related to the

transmitter.

Span Pot

The span pot is near the bottom of the amplifier (see Figure 1). Use the span pot to adjust

the transmitter’s response output during the calibration procedure.

Zero Pot

The zero pot is to the right of the span pot (see Figure 1). Use the zero pot to adjust the

transmitter’s target gas-free output during the start-up and calibration procedures.

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

adjust them.

Test Points

The test points (labeled TP+ and TP-) are to the left of the interconnect terminal strip

(see Figure 1). 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 voltmeter to measure the

transmitter’s output during the start-up and calibration procedures.

4 • 65-2400RK Combustible Gas Transmitter

Junction Box

Use the junction box to install the combustible gas 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). The detector has 1/2 in. NPT mounting threads, so a 3/4 in NPT. x 1/2 in. NPT

reducer is used to mount it.

NOTE: The combustible gas detector and amplifier are factory-mounted to the

junction box.

Use the junction box’s two mounting holes to mount the combustible gas transmitter to a

vertical surface at the monitoring site. Use the cover on the front of the junction box to

access the interior of the junction box.

65-2400RK Combustible Gas Transmitter • 5

Installation

This section describes procedures to mount the combustible gas transmitter in the

monitoring environment and wire the transmitter to the controller.

Mounting the Combustible Gas 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 lighter gases,

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

floor.

Figure 2: Mounting the Combustible Gas Transmitter

If the combustible gas detector is mounted to the junction box, skip to step 5. If not,

continue with step 2.

2. Remove the junction box cover.

3. Guide the four wires that extend from the top of the combustible gas detector through

the bottom conduit hub of the junction box.

4. Screw the combustible gas detector into the bottom conduit hub of the junction box.

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 combustible gas transmitter with the detector facing down (see Figure 2).

2.3 in.

(5.8 cm)

5.2 in.

Note: The junction box is

4.6 in. (11.7 cm) deep.

(13.2 cm)

7.7 in. (max.)

(19.6 cm)

5.46 in.

(13.9 cm)

2.75 in.

(7.0 cm)

0.25 in.

DIA.

6 • 65-2400RK Combustible Gas Transmitter

Wiring the Combustible Gas Transmitter to a Controller

WARNING: Always verify that the power source 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. Verify that the detector leads are wired to the amplifier’s interconnect terminal strip.

If necessary, connect the detector leads to the interconnect terminal strip as shown in

Figure 3.

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

conduit hub of the junction box.

6. Connect the three wires to the interconnect terminal strip as follows (see Figure 3).

• Connect the positive wire to the 24VDC terminal.

• Connect the feedback wire to the 4-20 (FB) terminal.

• Connect the negative wire to the DC - 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 at the controller to chassis ground.

7. Secure the junction box cover to the junction box.

8. Route the cable or wires leading from the combustible gas transmitter through one of

the conduit 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 transmitter signal to the

controller.

9. Connect the wires to the applicable transmitter terminal strip at the controller as

shown in Figure 3 below.

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