RKI Instruments 35-3010RKA-04H Manuale utente

RKI Instruments, Inc.

www.rkiinstruments.com

35-3010RKA-04H Sample-Draw

Detector Head

Operator’s Manual

Part Number: 71-0605

Revision: P1

Released: 8/16/22

2• 35-3010RKA-04H Sample-Draw Detector Head Operator’s Manual

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. For most applications,

typical calibration frequencies are between 3 and 6 months but can be

more often or less often based on your usage.

35-3010RKA-04H Sample-Draw Detector Head Operator’s Manual • 3

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:

• Absorbent cartridges

•Fuses

• Pump diaphragms and valves

•Batteries

• Filter elements

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. INNO

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.

4• 35-3010RKA-04H Sample-Draw Detector Head Operator’s Manual

Table of Contents

Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Flow System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Detection System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Mounting the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Connecting the Sample Lines to the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . 17

Wiring the Sample-Draw Detector to a Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Low Flow Alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Replacing Components of the Sample-Draw Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Adjusting the Low Flow Setting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Calibration Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Calibration, Hydrogen Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

35-3010RKA-04H Sample-Draw Detector Head Operator’s Manual • 5

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Calibration, Oxygen Detector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Setting the Fresh Air Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

6• Overview 35-3010RKA-04H Sample-Draw Detector Head

Overview

This manual describes the 35-3010RKA-04H sample-draw detector. This manual also describes

how to install, start up, maintain, and calibrate the detector. 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 35-3010RKA-04H.

WARNING: When using the 35-3010RKA-04H, you must follow the instructions and

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

35-3010RKA-04H and to minimize the risk of personal injury. Be sure to

maintain and periodically calibrate the 35-3010RKA-04H as described in this

manual.

Table 1: Specifications

Target Gases & Detection Ranges Hydrogen (H2): 0 - 100% LEL

Oxygen (O2): 0 - 25% volume

Input Power 24 VDC

Current Draw 275 mA

Output Signals 4-20 mA each channel

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

Dimensions 15.44 in. H x 12.55 in. W x 8.31 in. D

Weight 14 lbs.

Sampling Method Sample-draw

Sample Flow 1.2 SCFH (nominal)

Response Time 90% in 30 seconds

Accuracy

Hydrogen:

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

Oxygen:

± 0.5% O2

35-3010RKA-04H Sample-Draw Detector Head Description • 7

Description

This section describes the components of the 35-3010RKA-04H sample-draw detector. The

sample-draw detector consists of the housing, flow system, and detection system.

Figure 1: Sample-Draw Detector Component Location

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.

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. Use the two conduit hubs on the bottom of the

housing to make wiring connections.

4/20

ZER O

SPAN

BKRD

OXY

TP -

BATT

TOXIC

Flow

Block

Amp 1

TP +

OXY

24V

Hydrophobic

Filter (AcroPak)

Oxygen Sensor

Pump

Preamp

Circuit

Board

H2S Sensor

Dummy Plug

LEL Transmitter

Charcoal Filter

Inlet Fitting For 1/4" OD

Rigid Tubing

3/4 Conduit Hub, 2X

Exhaust Fitting For 1/4"

OD Rigid Tubing

Hydrogen Sensor

CO Dummy Plug

Amp 2

Oxygen Transmitter

Main CircuitBoard

Reset Switch

8• Description 35-3010RKA-04H Sample-Draw Detector Head

An aluminum subpanel is mounted to the interior of the housing. The sample-draw detector’s

internal components are mounted to the subpanel.

Flow System

The sample-draw detector’s flow system consists of the INLET fitting, hydrophobic filter,

charcoal filter, pump, flowmeter, bypass valve, status lights, pressure switch, flow block, and

EXHAUST fitting (see Figure 1). Figure 2 illustrates how the gas sample moves through the flow

system.

Figure 2: Sample-Draw Detector Flow Diagram

Oxygen

Charcoal

Filter

Pressure Switch

Flow meter

Bypass

Valve

Flow Block

H2S

Pump

Exhaust

Inlet Hydrophobic

Filter

35-3010RKA-04H Sample-Draw Detector Head Description • 9

INLET Fitting

The INLET fitting on the bottom of the housing allows the gas sample to enter the sample-draw

detector. The INLET fitting accepts 1/4 in. rigid tubing. See “Installation” on page 16 for

instructions to connect tubing to the INLET fitting.

Hydrophobic Filter

The hydrophobic filter is to the left of the main circuit board. It is held in place by a metal clip. It

prevents water and other liquids from contaminating the flow system. Replace the filter when it

appears dirty, discolored, or clogged. If a liquid other than water is drawn into the filter, replace

the filter as soon as possible.

Charcoal Filter

The charcoal filter is located above the LEL transmitter. It is held in place by a metal clip. The

charcoal filter is placed after the H2S sensor and before the CO sensor in the flow system. It

scrubs out interfering gases which may cause the CO sensor to respond, such as H2S or certain

hydrocarbons. Replace the charcoal filter when false high CO readings are noticed, especially in

the presence of H2S. It is included in this version of the sample draw detector in case a CO sensor

is added in the field. If a CO sensor is added in the field, a new charcoal filter should also be

installed.

Pump

The pump is located to the left of the main circuit board near the bottom left of the sample-draw

detector. 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 to the sample draw detector.

Flowmeter

The flowmeter is attached to the main circuit board near the top left corner (see Figure 5). A ball

in the flowmeter column indicates the flow rate to the sensors. The flowmeter measures the flow

in the range 0.2 to 2.0 SCFH (Standard Cubic Feet per Hour). Although the sample-draw detector

will operate down to a flow of 0.6 SCFH, the optimum flow rate is 1.2 SCFH.

Bypass Valve

The bypass valve is to the left of the flowmeter. The bypass valve adjusts the flow rate to the

sensors. Use a flat-blade screwdriver to adjust the bypass valve.

NOTE: The bypass valve allows fine adjustments of the flow rate. For a wider range of

adjustment, use the flow adjust potentiometer (see Figure 5).

Status Lights

Two status lights are above the flowmeter.

Pilot Light

The green Pilot light is on when the sample-draw detector is receiving power.

10 • Description 35-3010RKA-04H Sample-Draw Detector Head

Fail Light

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

NOTE: The factory set low flow level is 0.6 SCFH (±0.2). See “Adjusting the Low Flow

Setting” on page 25 for instructions to adjust this setting.

Pressure Switch

The pressure switch is mounted to the opposite side of the main circuit board. The pressure switch

monitors the flow rate to the sensors.

If the flow rate falls below the preset low flow level, the pressure switch causes the fail relay to

interrupt the sensor signal from the hydrogen and oxygen channels and the signal in the 4-20 mA

line for the CO and H2S channels. This causes a downscale reading at the monitor on these

channel. The low flow level is factory-set at 0.6 SCFH (±0.2 SCFH).

NOTE: There is no low flow indication for the hydrogen or oxygen channel in the 35-

3010RKA-04H.

Flow Block

The flow block is located in the lower right corner of the sample-draw detector. All the sensors are

installed in the flow block. The flow block routes the sampled air to each sensor.

EXHAUST Fitting

The EXHAUST fitting on the bottom of the housing allows the gas sample to exit the sample-

draw detector. The EXHAUST fitting accepts 1/4 in. rigid tubing. See “Installation” on page 16

for instructions to connect tubing to the EXHAUST fitting.

Detection System

The detection system consists of the gas sensors, LEL and oxygen transmitters, preamp circuit

board, and the main circuit board.

Hydrogen Sensor

The hydrogen sensor is installed in the lower left of the flow block. The hydrogen sensor includes

the sensing elements, flame arrestor, connector, and sensor leads.

Sensing Elements

Two sensing elements are protected within the sensor assembly. Through a series of thermal and

electronic reactions, these elements produce an output that is proportional to the detection range

of the sample draw detector. The LEL transmitter converts the output to a 4 - 20 mA signal which

can be used by a recording or monitoring device.

The porous flame arrestor allows the gas sample to enter the sensor assembly and contact the

sensing element. The flame arrestor also contains sparks within the sensor.The sensor has a built-

in molecular sieve that only allows hydrogen to diffuse into the detector.

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