RKI Instruments 35-3001A-14 Bedienungsanleitung

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35-3001A-14

Methane Sample-Draw Detector

Operator’s Manual

Part Number: 71-0603

Revision: P1

Released: 8/10/22

35-3001A-14 Methane 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-14 Methane 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-14 Methane 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 Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

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

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

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

Replacing Components of the Sample-Draw Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

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 Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Setting the Response Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

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

35-3001A-14 Methane Sample-Draw Detector • 1

Overview

This operator’s manual describes the 35-3001A-14 methane 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 methane sample-draw detector. See the controller Operator’s Manual for

information specific to the controller.

WARNING: When using the 35-3001A-14, you must follow the instructions and warnings in

this manual to assure proper and safe operation of the 35-3001A-14 and to

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

calibrate the 35-3001A-14 as described in this manual.

Table 1: Specifications

Target Gases and Detection Range Methane: 0 - 100% LEL

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

50 feet 0 feet

* RKI Instruments, Inc. does not recommend installing this tubing

size on both the inlet and exhaust.

Maximum Recommended Inlet/

Exhaust Line Length for

1/4” O.D. x 0.170” I.D. Tubing

Inlet Exhaust

50 feet 50 feet

75 feet 0 feet

Response Time 90% in 30 seconds

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

2 • 35-3001A-14 Methane Sample-Draw Detector

Description

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

Figure 1: Methane Sample-Draw Detector Component Location

_Pump

Oxygen

Sensor

Terminal

Strip

Mounting

Foot, 4X

PWR/SIG

Sensor

Current

14 8mA

Detector/Amp

Terminal Strip

(Factory

Wired)

GW B

LEL

GBR

OXY

AMP 2AMP

Pilot LED

Fail LED

Sensor Flow

Control Valve

Pump Reset

Switch

Pressure

Switch

Adjustment

Screw

(behind PCB)

Flowmeter

BGW

Interconnect

Terminal

Strip

AMP 2

AMP 1

+ R

OXY

PWR/SIG

Particle

Filter

LEL /IR

Flowmeter Circuit

Board Connector

LEL /IR

Inlet

Fitting

Exhaust

Fitting

This End

To Inlet

Fitting 3/4" Conduit Hub

INLET

EXHAUST

IR Amplifier, x2

Pump Connector

Hydrophobic

Filter

IR CH4

Flow Block,x2

IR CH4 Sensor

(inside block), x2

IR CH4 Sensor

PCB, x2

35-3001A-14 Methane 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: Methane Sample-Draw Detector Flow Diagram

Flowmeter

IR CH4

Sensor

Pump

IR CH4

Sensor

Restrictor

Particle Filter

Flowmeter PCB

Exhaust

Sensor Flow

Control Valve

Hydrophobic Filter

Pressure Switch

Inlet

4 • 35-3001A-14 Methane 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 IR CH4amplifiers to the main circuit

board.

NOTE: The IR CH4amplifiers are 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. This terminal strip is not used in this version of the sample-draw detector.

Pump Connector

The pump connector is the two-point connector below the oxygen 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 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 detector. Turn the valve’s knob clockwise to increase the flow

and counterclockwise to decrease the flow.

35-3001A-14 Methane Sample-Draw Detector • 5

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.

IR CH4Sensor/IR CH4Sensor PCB

Each methane sensor is an infrared type plug-in detector. They are each installed in an IR CH4flow block

and the IR CH4flow blocks are mounted to the middle of the main circuit board. A small circuit board, the

IR CH4sensor PCB, with a 4-wire cable mates to the IR CH4sensor and retains each sensor in the flow

block. The cable is wired to an IR CH4amplifier. The IR CH4sensor PCB allows you to replace the sensor

without disconnecting the wiring.

6 • 35-3001A-14 Methane Sample-Draw Detector

IR CH4Amplifier

Each IR CH4amplifier converts the electrical output from the IR CH4 sensor to a 4 to 20 mA signal that

corresponds to the detection range and transmits the signal to a gas monitoring controller. A label on the

amplifier indicates the detector drive current. This drive current is factory set. One amplifier is mounted on

the top middle edge of the main circuit board. The other is mounted in the bottom left corner of the main

circuit board. Each amplifier consists of the zero pot, span pot, controller terminal strip, detector terminal

strip, and test points.

Figure 3: IR CH4Amplifier 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 (fresh air) output during

the start-up and calibration procedures. Turn the adjustment screw clockwise to increase the fresh air output

and counterclockwise to decrease the fresh air 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 gas response output during the calibration procedure. Turn

the adjustment screw clockwise to increase the span output and counterclockwise to decrease the span

output.

CAUTION: The amplifier includes additional pots. They are factory-set. Do not adjust them.

Controller and Detector Terminal Strips

The controller terminal strip and detector terminal strip are three- 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 sensor and 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.

Factory Set Pots

Sensor

Current

148mA

WLELGBR

Test Points

100-500 mV Range Zero Pot

Detector

Terminal Strip

Span Pot

Controller

Terminal Strip

PWR / SIG

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