RKI Instruments 35-3001A-02 Manuale utente

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35-3001A-02 Oxygen

Sample-Draw Detector

Operator’s Manual

Part Number: 71-0308RK

Revision: A

Released: 8/8/17

35-3001A-02 Oxygen Sample-Draw Detector

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.

35-3001A-02 Oxygen Sample-Draw Detector

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

35-3001A-02 Oxygen Sample-Draw Detector

Table of Contents

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

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

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

External Components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Internal Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

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

Mounting the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Connecting the Sample Lines to the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Wiring the Sample-Draw Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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

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

Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Replacing Components of the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Adjusting the Low Flow Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Removing the Particle Filter’s Tubing Stub, if Necessary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Calibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Returning to Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

35-3001A-02 Oxygen Sample-Draw Detector • 1

Overview

This operator’s manual describes the 35-3001A-02 oxygen sample-draw detector. This manual also

describes how to install, start up, maintain, and calibrate the sample-draw detector when using it

with a gas monitoring controller. A parts list at the end of this manual lists replacement parts and

accessories for the sample-draw detector.

Specifications

Table 1 lists specifications for the oxygen sample-draw detector. See the controller Operator’s

Manual for information specific to the controller.

WARNING: When using the 35-3001A-02, you must follow the instructions and warnings in

this manual to assure proper and safe operation of the 35-3001A-02 and to

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

calibrate the 35-3001A-02 as described in this manual.

Table 1: Specifications

Target Gas and Detection Range Oxygen: 0 - 25% volume

Input Power 24 VDC Nominal (18.5 VDC - 30 VDC)

Construction (housing) Fiberglass/polyester (NEMA 4X)

Dimensions 8.5 in. H x 6.5 in. W x 4.25 in. D

Weight 4.5 lbs.

Sampling Method Sample-draw

Sample Flow 3.0 SCFH typical, with no inlet or exhaust line

Flow to Sensor 1.0 SCFH (nominal)

Low Flow Setpoint 0.6 ± 0.1 SCFH

Maximum Recommended Inlet/

Exhaust Line Length for

1/4” O.D. x 1/8” I.D. Tubing

Inlet Exhaust

100 feet 0 feet

50 feet 50 feet

Maximum Recommended Inlet/

Exhaust Line Length for

1/4” O.D. x 0.170” I.D. Tubing

Inlet Exhaust

100 feet 100 feet

Response Time 90% in 30 seconds

Accuracy ± 0.5% O2

2 • 35-3001A-02 Oxygen Sample-Draw Detector

Description

This section describes the components of the oxygen sample-draw detector.

Figure 1: Oxygen Sample-Draw Detector Component Location

Mounting

Foot, 4X

Oxygen

Sensor

Terminal

Strip

OXY SIG /PWR

Oxygen

Sensor

Oxygen Flow

Block

Pilot LED

Fail LED

Sensor

Flow

Control

Valve

Interconnect

Terminal

Strip

Pump Reset

Switch

Flowmeter

OXY

+ RGS

AMP 2

AMP 1

Hydrophobic

Filter

LEL /IR

Flowmeter Circuit

Board Connector

Particle Filter

Exhaust

Fitting

Inlet

Fitting

This End To

Inlet Fitting

3/4" Conduit Hub

Pump

TOXIC

EXHAUST

INLET

Pump Connector

Oxygen Amplifier

OXY

+ RS BG

Pressure

Switch

Adjustment

Screw

(behind PCB) Detector/Amp

Terminal Strip

LEL /IR

AMP AMP 2

35-3001A-02 Oxygen Sample-Draw Detector • 3

External Components

This section describes the sample-draw detector’s external components.

Housing

The sample-draw detector’s fiberglass housing is weather- and corrosion-resistant. It is suitable for

installation where general purpose equipment is in use.

The housing door is hinged on the left side and is secured by two latches on the right side. The

flowmeter and status LEDs are visible through a window in the housing door.

Four mounting feet are attached to the back of the housing (one at each corner). Use the mounting

feet to install the housing to a vertical surface.

Sample Fittings

The sample fittings are located on the left side of the bottom of the housing. The inlet fitting is near

the front of the housing and the exhaust fitting is near the back of the housing. The sample fittings

accept 1/4 in. rigid tubing. See the Installation section on page 7 to connect tubing to the sample

fittings.

Particle Filter

A particle filter with a tubing stub on one end is shipped with the instrument but it is not factory

installed. If the particle filter is installed directly to the inlet fitting, the tubing stub must be used. If

the particle filter is installed somewhere else, like at the end of the inlet line, the tubing stub can be

used or removed.

Conduit Hub

One 3/4” conduit hub is located on the right side of the bottom of the housing. It is used for routing

wiring into the housing by using conduit or an appropriate cable bushing.

Internal Components

This section describes the sample-draw detector’s internal components (see Figure 1). Figure 2

illustrates how the gas sample moves through the flow system.

Figure 2: Oxygen Sample-Draw Detector Flow Diagram

Flowmeter

Pump

Oxygen

Sensor

Particle Filter

Exhaust

Flowmeter PCB

Hydrophobic Filter

Pressure Switch

Restrictor

Inlet

Sensor

Flow

Control

Valve

4 • 35-3001A-02 Oxygen Sample-Draw Detector

Main Circuit Board

The main circuit board includes the detector/amp terminal strip, interconnect terminal strip, oxygen

sensor terminal strip, pump connector, and flowmeter circuit board connector (see Figure 1).

Detector/Amp Terminal Strip

The detector/amp terminal strip is the upper twelve-point terminal strip in the bottom right corner

of the main circuit board. Use the detector/amp terminal strip to connect the oxygen sensor to the

amplifier and to connect the amplifier to the main circuit board.

NOTE: The oxygen sensor is factory wired to the oxygen sensor terminal strip and the amplifier

is factory-wired to the main circuit board. See the “Installation” section on page 7 for all

wiring procedures related to the sample-draw detector.

Interconnect Terminal Strip

The interconnect terminal strip is the lower twelve-point terminal strip in the bottom right corner of

the main circuit board. Use the interconnect terminal strip to connect the sample-draw detector to a

controller.

Oxygen Sensor Terminal Strip

The oxygen sensor terminal strip is a two-point terminal strip in the upper right corner of the main

circuit board. Use the oxygen sensor terminal strip to connect the oxygen sensor to the main circuit

board.

NOTE: The oxygen sensor is factory-wired to the main circuit board. See the “Installation”

section on page 7 for all wiring procedures related to the sample-draw detector.

Pump Connector

The pump connector is the two-point connector below the oxygen sensor terminal strip in the upper

right corner of the main circuit board. Use the pump connector to connect the pump to the main

circuit board.

NOTE: The pump is factory-wired to the main circuit board. See “Installation” on page 7 for all

wiring procedures related to the sample-draw detector.

Flowmeter Circuit Board Connector

The flowmeter circuit board connector is a six-position connector in the upper left corner of the

main circuit board. Use the flowmeter circuit board connector to connect the flowmeter circuit

board to the main circuit board.

NOTE: The flowmeter circuit board is factory wired to the main circuit board. See “Installation”

on page 7 for all wiring procedures related to the sample-draw detector.

Flowmeter Circuit Board

The flowmeter circuit board is mounted to the left side of the main circuit board using standoffs. It

includes the flowmeter, sensor flow control valve, status LEDs, pressure switch, and pump reset

switch.

Flowmeter

The flowmeter is mounted to the right side of the flowmeter circuit board. You can see it through

the window in the door. A ball in the flowmeter column indicates the flow rate to the sensor. The

35-3001A-02 Oxygen Sample-Draw Detector • 5

flowmeter measures the flow in the range 0.2 to 2.0 SCFH (Standard Cubic Feet per Hour). The

optimum flow rate is 1.0 SCFH.

Sensor Flow Control Valve

The sensor flow control valve is mounted to the flowmeter circuit board above the flowmeter. The

sensor flow control valve adjusts the flow rate to the sensor. Turn the valve’s knob

counterclockwise to increase the flow and clockwise to decrease the flow.

Status LEDs

Two status LEDs are above the flowmeter. They are also visible through the window in the housing

door. The green Pilot LED is on when the sample-draw detector is receiving power from the

controller. The red Fail LED is on when the sample flow rate is below the low flow level.

Pressure Switch

The pressure switch is mounted to the back of the flowmeter circuit board. The pressure switch

monitors the flow rate of the incoming gas sample.

If the flow rate falls below the preset low flow level, the pressure switch causes the Fail LED to

turn on and interrupts the signal from the detector. The interrupted detector signal causes a fail

condition at the controller. The low flow level is factory-set at 0.6 SCFH (±0.1 SCFH). See

“Adjusting the Low Flow Setting” on page 16 to adjust this setting.

Pump Reset Switch

The pump reset switch is located to the left of the status LEDs. When a low flow condition occurs,

the pump will be shut off. To reset the low flow condition and start the pump again, press and hold

the pump reset switch for about 2 seconds, then release.

Hydrophobic Filter

The hydrophobic filter is located toward the bottom left of the main circuit board. The filter

prevents particulates and water in the incoming gas sample from damaging the flow and detection

systems. Replace the filter when it appears dirty, discolored, or clogged.

Pump

The pump is mounted to the right side of the main circuit board. The pump pulls the gas sample

into the sample-draw detector. The pump operates on 24 VAC, which is generated from the 24

VDC supplied by the controller.

Oxygen Sensor

The oxygen sensor is installed in a flow block and the flow block is mounted to the middle of the

main circuit board. The oxygen sensor is retained in the flow block by a bracket with two screws.

The oxygen cell is protected within the sensor assembly. Through a series of chemical and

electronic reactions, the oxygen cell produces a millivolt output that is proportional to the detection

range of the sample-draw detector. The leads extending from the sensor are factory wired to the

oxygen sensor terminal strip.

6 • 35-3001A-02 Oxygen Sample-Draw Detector

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. The

amplifier is mounted on the top middle edge of the main circuit board. It consists of the zero pot,

span pot, controller terminal strip, detector terminal strip, and test points.

Figure 3: Amplifier Component Location

Zero Pot

The zero pot is located in the upper right 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.

Span Pot

The span pot is located below 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 procedure. Turn the adjustment screw clockwise to increase the fresh air output and

counterclockwise to decrease the fresh air output.

CAUTION: The amplifier includes an additional pot. It is factory-set. Do not adjust it.

Controller and Detector Terminal Strips

The controller terminal strip and detector terminal strip are two- and four-position plug-in style

terminal strips, respectively. The controller terminal strip is located on the right side of the

amplifier and the detector terminal strip is to the left of it. Both terminal strips are factory wired to

the detector/amp terminal strip on the main circuit board.

Test Points

The test points are on the left side of the amplifier (see Figure 3). The test points produce a 100 mV

to 500 mV output that corresponds to the sample-draw detector’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 upper left corner is the negative (-) test point and the red test

point to the left of the zero and span pots is the positive (+) test point.

SIG/PWR

OXY

Zero Pot

Span Pot

Factory Set Pot

Controller

Terminal Strip

Test Points

100-500 mV Range

Detector

Terminal Strip

TOXIC

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