RKI Instruments 65-2322-04SS Manuale utente

RKI Instruments, Inc.

www.rkiinstruments.com

65-2322-04SS

Oxygen Transmitter

Operator’s Manual

Part Number: 71-0481

Revision: P1

Released: 1/28/19

65-2322-04SS Oxygen 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.

65-2322-04SS Oxygen 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

65-2322-04SS Oxygen Transmitter

Table of Contents

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

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

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

Oxygen Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Calibration Adapter/Splash Guard. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Amplifier Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Detector Junction Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Mounting the Oxygen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Wiring the Detector to the Amplifier. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Wiring the Amplifier to a Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Setting the Fresh Air Signal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Replacing Components of the Oxygen Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Determining Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Preparing for Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Setting the Fresh Air Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

65-2322-04SS Oxygen Transmitter • 5

Overview

This manual describes the 65-2322-04SS explosion-proof oxygen (O2) 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 oxygen

transmitter.

Specifications

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

manual.

Table 1 lists specifications for the oxygen transmitter.

NOTE: The following symbol on the detector label is a caution to the user to refer to this

documentation for installation and operation instructions:

WARNING: When using the 65-2322-04SS, you must follow the instructions and

warnings in this manual to assure proper and safe operation of the

65-2322-04SS and to minimize the risk of personal injury. Be sure to

maintain and periodically calibrate the 65-2322-04SS as described in this

manual.

Table 1: Specifications

Target Gas Oxygen (O2)

Detection Range 0 to 100 PPM (parts per million)

Area Classification Explosion-proof for Class I, Groups B, C, and D

Temperature Code T6

Installation Category Installation Category 1. Signal level, special equipment or parts of

equipment, telecommunication, electronic, etc., with smaller

transient overvoltages than Installation Category (Overvoltage

Category) II (ref. IEC 664).

Input Voltage 11 VDC - 30 VDC

Sampling Method Diffusion

Signal Output 4 to 20 mA

Oxygen Detector Signal Output 0 mV at 0% oxygen nominal

18 mV at 25% oxygen nominal

Response Time 90% in 30 seconds

Accuracy ± 0.5% O2

6 • 65-2322-04SS Oxygen Transmitter

Description

This section describes the components of the oxygen transmitter. The transmitter is a 4 - 20

mA type detector head. It consists of the oxygen detector, calibration adapter/splash

guard, amplifier, the amplifier junction box, and the detector junction box. The two-

junction-box configuration is intended for situations where the detector needs to be

installed at an inaccessible location. The detector junction box can be installed at the

inaccessible location and the amplifier junction box can be installed in a more readily

accessible area.

Figure 1: Component Location

TO X IC OX Y

SIG/PWR

Terminal Strip

Amplifier

Detector J-Box

Oxygen Detector

SPAN

ZERO

Amplifier J-Box

Calibration Adapter/Splash Guard

65-2322-04SS Oxygen Transmitter • 7

Oxygen Detector

The oxygen detector consists of the detector housing body, detector housing cap, cap

gasket, and the plug-in sensor.

Figure 2: Oxygen Detector Component Location

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 oxygen 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 oxygen detector to the amplifier. One of the

wires is white and one of the wires is green.

The housing includes two sockets installed on a circuit board. These sockets accept the

plug-in sensor’s two pins to provide electrical connection for the sensor. The circuit board

with the sockets conditions the sensor’s signal before the signal reaches the amplifier.

Housing Cap & Cap Gasket

The housing cap screws onto the detector housing. It retains the plug-in sensor and

protects it from damage. A foam gasket is installed inside the housing cap that seals

against the sensor face. 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 from 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.

Plug-In Oxygen Sensor

The plug-in sensor is secured in the detector assembly by the housing cap. Through a

series of chemical and electrical reactions, the sensor produces a millivolt output that

corresponds to the detection range of the transmitter.

Cap Gasket

Flame Arrestor

Guard

Detector Housing Cap

Plug-in Oxygen Sensor

Detector HousingBody

8 • 65-2322-04SS Oxygen Transmitter

Calibration Adapter/Splash Guard

A calibration adapter/splash guard is installed on the oxygen detector. A fitting at the

bottom of the calibration adapter/splash guard allows a length of tubing to be connected

for calibration and routed to a more easily accessible location (near the amplifier junction

box is optimal for ease of calibration). The calibration adapter/splash guard also protects

the detector from splashing water or direct water spray.

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 3).

Figure 3: Amplifier Component Location

Controller Terminal Strip

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

amplifier.

Zero Pot

The zero pot is located in the upper left corner of the amplifier (see Figure 3). Use a small

flat blade screwdriver to turn the zero pot’s adjustment screw and adjust the amplifier’s

zero (oxygen free) output during the calibration procedure. Turn the adjustment screw

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

SIG/PWR

TOXIC OXY

Detector Terminal Strip

Controller Terminal Strip

SPAN

ZERO

+ Test Point (Red)

- Test Point (Black)

Factory Adjust Pot

Span Pot

Zero Pot

65-2322-04SS Oxygen Transmitter • 9

Span Pot

The span pot is located to the right of the zero pot (see Figure 3). Use a small flat blade

screwdriver to turn the span pot’s adjustment screw and adjust the amplifier’s fresh air

output during the start up and calibration procedures. 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 3). 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.

Amplifier Junction Box

The amplifier junction box protects the amplifier and wiring connections made to the

amplifier. Use the top 3/4 NPT conduit hub to connect wiring from the amplifier to the

controller. Use the bottom 3/4 NPT conduit hub to wire the remotely installed oxygen

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

box. The amplifier is 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.

Detector Junction Box

The stainless steel detector junction box is intended to be installed remotely from the

amplifier junction box. The oxygen detector is factory installed in the bottom 3/4 NPT

conduit hub. A terminal strip is provided for wiring connections and the detector is

factory wired to one side of this terminal strip. The other side of the terminal strip is for

user-supplied wiring to the detector terminal strip located in the amplifier junction box.

This wiring should go through the top 3/4 NPT conduit hub. An O-ring seals the interface

between the junction box cover and the junction box base.

A cover on the front of the junction box allows access to the interior of the junction box. A

locking set screw on the junction box cover allows you to secure the junction box cover

and prevent it from being removed.

10 • 65-2322-04SS Oxygen Transmitter

Installation

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

environment and wire the transmitter to a controller.

Mounting the Oxygen Transmitter

1. Select a mounting site that is representative of the monitoring environment. Consider

the following when you select the mounting site.

• For the amplifier junction box, select a site where the junction box is not likely to

be bumped or disturbed. Make sure there is sufficient room to perform start-up,

maintenance, and calibration procedures. The site should be easily accessible.

• For the detector junction box, select a site that is at breathing level.

• The junction boxes should be mounted no further than 200 feet from each other.

2. Amplifier junction box dimensions are shown in Figure 4. Detector junction box

dimensions are shown in Figure 5.

Figure 4: Amplifier Junction Box Dimensions

2.70 .38

Ø3.65

3/4 Conduit Hub

5.25

Rubber

Spacer,

Indice

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