RKI Instruments 65-2424RK Manuale utente

www.rkiinstruments.com

65-2424RK

Hydrogen Sulfide Transmitter

Operator’s Manual

Part Number: 71-0062RK

Revision: B

Released: 6/12/20

2 • 65-2424RK H2S Transmitter

WARNING

Read and understand this instruction manual before operating detec-

tor. 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 frequen-

cies for most applications are between 3 and 6 months, but can be

required more often or less often based on your usage.

65-2424RK H2S Transmitter • 3

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 APARTICULAR 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

4 • 65-2424RK H2S Transmitter

Table of Contents

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

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

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

H2S Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Sealing Spacer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Amplifier PCB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Mounting the H2S Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Wiring the H2S Transmitter to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

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

Setting the Zero Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Preventive Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Replacing Components of the H2S Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

65-2424RK H2S Transmitter • 5

Overview

This manual describes the 65-2424RK 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 H2S transmitter.

Specifications

Table 1 lists specifications for the H2S transmitter.

WARNING: When using the 65-2424RK, you must follow the instructions and warnings in

this manual to assure proper and safe operation of the 65-2424RK and to

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

calibrate the 65-2424RK as described in this manual.

Table 1: Specifications

Target Gas Hydrogen sulfide (H2S)

Sampling Method Diffusion

Input Voltage 10 VDC - 30 VDC

Signal Output 4 - 20 mA

Detection Range 0 to 100 PPM (parts per million)

Accuracy ± 5% of reading or ± 2 ppm H2S (whichever is greater)

Response Time 90% in 30 seconds

6 • 65-2424RK H2S Transmitter

Description

This section describes the components of the H2S transmitter. The transmitter consists of the

H2S sensor, sealing spacer, amplifier printed circuit board (PCB), and enclosure.

Figure 1: H2S Transmitter Component Location

H2S Sensor

The sensor is cylindrical with the sensing face on the top and the connection pins on the

bottom. The sensor plugs into the amplifier PCB with the four pins. The sensor is exposed to

the ambient air through an opening in the enclosure cover. Through a series of chemical and

electrical reactions, the sensor produces an electrical output that is proportional to the

detection range of the transmitter.

Sealing Spacer

The ring shaped plastic sealing spacer fills a gap in the rubber boot that is installed on the

sensor. The rubber boot is used to seal the sensor to the enclosure cover in both the CO and

H2S transmitters. In the CO transmitter the rubber boot also retains a charcoal filter. Since a

charcoal filter is not used in the H2S transmitter, the sealing spacer fills the space that would

be filled by the charcoal filter’s body.

ZERO

CAL-

CAL+

SPAN

Sensor (w/sealing

spacer & boot)

Enclosure

(shown w/out cover)

Interconnect

Terminal Strip

Amplifier PCB

Zero Pot

Span Pot

Test Point CAL-

Factory Set Pot

Amplifier PCB Mounting

Screw (under sensor)

Cable Bushing

Amplifier PCB

Mounting Screw

Test Point

CAL+

65-2424RK H2S Transmitter • 7

Amplifier PCB

The amplifier PCB 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 PCB includes the interconnect terminal strip, sensor sockets, span pot, zero pot,

and test points (see Figure 1).

Interconnect Terminal Strip

The interconnect terminal strip is the four-point terminal strip on the lower left side of the

amplifier PCB. Use the interconnect terminal strip to connect the transmitter to a controller.

Sensor Sockets

There are four sensor sockets located in a circular pattern near the top of the amplifier PCB.

The sensor plugs into these sockets.

Span Pot

The span pot is near the bottom right corner of the amplifier PCB. 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 gas-free

output during the start-up and calibration procedures.

CAUTION:There is a third potentiometer on the PCB, the null potentiometer. It is factory-set.

Do not adjust it.

Test Points

The test points (labeled CAL+ and CAL-) are on the right of the interconnect terminal strip.

The test points produce a 100 - 500 mV output that is proportional to the transmitter’s 4 - 20

mA output. Use the test points and a voltmeter to measure the transmitter’s output during the

start-up and calibration procedures.

Enclosure

The enclosure enables you to install the H2S transmitter at a mounting site that is remote from

the controller. The enclosure also protects the amplifier PCB and wiring connections made to

the transmitter. Use the cable bushing on the bottom of the enclosure to connect wiring from

the amplifier PCB to a controller.

Use the enclosure’s two mounting holes, accessible with the cover removed, to mount the H2S

transmitter to a vertical surface at the monitoring site. Use the cover on the front of the

enclosure to access the interior of the enclosure.

8 • 65-2424RK H2S Transmitter

Installation

This section describes procedures to mount the H2S transmitter in the monitoring environment

and wire the transmitter to a gas monitoring 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, mount the transmitter at

approximately breathing level.

Figure 2: Mounting the H2S Transmitter

2. Remove the enclosure’s cover by unscrewing the four cover screws, one at each corner.

3. At the monitoring site, use #6 screws through the enclosure’s two mounting holes to

secure it to a vertical surface.

4. Secure the cover to the enclosure with the four cover screws.

1.50 .54

.24

2.52

H S Sensor

3.86 3.39

1.42

Ø .160 mounting hole,

2X, Accessible With Lid

Removed

.80 max Cable Bushing

65-2424RK H2S Transmitter • 9

Wiring the H2S Transmitter to a Controller

WARNING: Always verify that the power source is off before you make wiring connections.

1. Turn off the controller.

2. Turn off or unplug incoming power at the power source end.

3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each corner.

4. Guide a two-conductor, shielded cable through the cable bushing at the bottom of the

enclosure.

5. Connect the two wires to the interconnect terminal strip as follows (see Figure 3).

• Connect the positive wire to the terminal labeled +V.

• Connect the feedback wire to the terminal labeled FB.

CAUTION:Leave the shield drain wire insulated and disconnected at the transmitter. You will

connect the opposite end of the cable’s drain wire at the controller.

6. Secure the cover to the enclosure.

7. Route the cable leading from the H2S transmitter through one of the conduit hubs at the

controller housing.

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

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

controller.

10 • 65-2424RK H2S Transmitter

8. Connect the wires to the applicable controller transmitter terminal strip as shown in Figure

3 below.

Figure 3: Wiring the H2S Transmitter to a Controller

9. 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.

3. Turn on or plug in the incoming power to the controller, then turn on the controller.

4. Verify that the controller is on and operating properly. Refer to the controller operator’s

manual.

Controller or Recording

Device

4-20mAIn(FB)

+ (10 VDC - 30VDC)

ZERO

SPAN

CAL+

CAL-

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