RKI Instruments 65-2380SS Bedienungsanleitung

RKI Instruments, Inc.

www.rkiinstruments.com

65-2380SS

Molecular Property Spectrometer

Combustible Gas Detector

Operator’s Manual

Part Number: 71-0620

Revision: 0

Released: 1/23/23

2• 65-2380SS Molecular Property Spectrometer

WARNING

Read and understand this instruction manual before operating

transmitter. Improper use of the transmitter could result in bodily

harm or death.

Periodic calibration and maintenance of the transmitter is essential for

proper operation and correct readings. Please calibrate and maintain

this transmitter regularly! Frequency of calibration depends upon the

type of use you have and the sensor types. For most applications,

typical calibration frequencies are between 6 and 12 months but can

be more often or less often based on your usage.

65-2380SS Molecular Property Spectrometer • 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

• Pump diaphragms and valves

•Fuses

•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 APARTI CULAR 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• 65-2380SS Molecular Property Spectrometer

Table of Contents

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

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

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

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

MPS Detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Junction Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

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

Mounting the Combustible Gas Transmitter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Wiring the Combustible Gas Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Startup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Introducing Incoming Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Setting the Zero Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Replacing the MPS LEL Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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

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

Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Preparing for Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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

Setting the Response Reading. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Returning to Normal Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Overview • 5

Overview

This manual describes the 65-2380SS MPS combustible gas detector. This manual also describes

how to install, start up, maintain, and calibrate the detector when used with a gas monitoring

controller. A parts list at the end of this manual lists replacement parts and accessories for the

combustible gas detector.

Specifications

Table 1 specifies the detection ranges and accuracy for each target gas the MPS sensor can detect.

Table 1: Detection Ranges and Accuracy

Target Gas Formula Detection Range Accuracy

at 50% LEL

Butane C4H10 0 - 100% LEL ± 5% LEL

Ethane C2H60 - 100% LEL ± 5% LEL

Hydrogen H20 - 100% LEL ± 5% LEL

Isobutane HC(CH3)30 - 100% LEL ± 5% LEL

Isobutylene C4H80 - 100% LEL ± 5% LEL

Isopropanol C3H8O 0 - 100% LEL ± 10% LEL

Methane CH40 - 100% LEL ± 3% LEL

Methyl Ethyl Ketone C4H8O 0 - 100% LEL ± 5% LEL

Octane C8H18 0 - 100% LEL ± 5% LEL

Pentane C5H12 0 - 100% LEL ± 5% LEL

Propane C3H80 - 100% LEL ± 6% LEL

Propylene C3H60 - 100% LEL ± 5% LEL

Toluene C7H80 - 100% LEL ± 12% LEL

Xylene C8H10 0 - 100% LEL ± 12% LEL

NOTE: The MPS sensor will respond to other combustible gases, but the accuracy has

only been determined for these 14 gases.

6• Applications

WARNING: When using the 65-2380SS, you must follow the instructions and warnings in

this manual to assure proper and safe operation of the 65-2380SS and to

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

calibrate the 65-2380SS as described in this manual.

Applications

The MPS combustible detector is most effective in the following applications:

• High concentrations of hydrogen sulfide (H2S) or silicones present where sensor

poisoning is a common problem

• High-humidity environments where catalytic or IR sensors may not hold up

• Environments more likely to have mixtures of hydrocarbons present

Table 2: Specifications

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

Operating Temperature

Range

-20ºC to +50ºC (-4ºF to +122ºF)

Humidity Range 0 - 100% RH (non-condensing)

Pressure Range 80 - 120 kPa

Sampling Method Diffusion

Response Time T90 in 25 seconds

Dead Bands

•Methane(CH

4): 3% LEL

• All other gases: 5% LEL

NOTE: If the connected controller’s dead band setting is 2% LEL for

an MPS channel, a reading will not be displayed until it has exceeded

the MPS sensor's internal dead band.

Description • 7

Description

The 65-2380SS combustible gas transmitter utilizes a Molecular Property Spectrometer (MPS)

sensor. The MPS sensor is immune to poisons, can be used in high humidity, and does not require

calibration as often as catalytic combustible sensors. It also responds accurately to 14 different

combustible gases.

This section describes the components of the combustible gas transmitter. The transmitter is a 4 -

20 mA type detector head. It consists of the combustible gas detector, amplifier, and junction box.

Figure 1: Component Locations

R G

LEL PWR / SIG

WBS

Amplifier

J-Box

MPS LEL

Detector

ZERO

SPAN

Sensor

Current

8• Description

MPS Detector

The MPS LEL detector is made up of the MPS combustible gas LEL detector housed and

encapsulated in a pipe nipple. The pipe nipple has 3/4 NPT threads on each end and a 1-1/4 inch

hex that allows removal or installation of the detector with a wrench. A porous flame arrestor

coated with a hydrophobic film that repels liquids is on one end of the detector and allows sample

gas to enter the detector. Four color coded leads, red, white, green, and black, extend from the

other end of the detector. Use the leads when connecting the detector to the terminal block in the

junction box.

Junction Box

The stainless steel, corrosion-resistant junction box allows you to install the detector at a

mounting site that is remote from a controller, and it protects the amplifier and wiring connections

made to the amplifier. An O-ring seals the interface between the junction box cover and the

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

box cover and prevent it from being removed.

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

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

amplifier are factory installed in the junction box.

Amplifier

The amplifier converts the electrical output from the detector to a 4 - 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. A label on the amplifier indicates the detector drive current. The amplifier includes the

detector terminal strip, controller terminal strip, span pot, zero pot, and test points (see Figure 2).

Figure 2: Amplifier Component Location

Black - Test Point

LEL PWR / SIG

ZERO

SPAN

Sensor

Current

Factory Adjust Pot

Zero Pot

Span Pot

Amplifier

Mounting Screw

Detector Terminal Strip

Controller Terminal Strip

Red + Test Point

Description • 9

Controller Terminal Strip

The controller terminal strip is a three position plug-in style terminal strip located near the top of

the amplifier. Use the controller terminal strip to wire the combustible gas transmitter to a

controller.

Detector Terminal Strip

The detector terminal strip is a four position plug-in style terminal strip located below the

controller terminal strip. Use the detector terminal strip to connect the MPS LEL detector to the

amplifier.

NOTE: The MPS LEL detector is factory-wired to the detector terminal strip. See “Wiring the

Combustible Gas Detector to a Controller” on page 11 for all wiring procedures related

to the transmitter.

Zero Pot

The zero pot is located in the upper left corner of the amplifier (see Figure 2). 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 zero output and counterclockwise to decrease the zero output.

Span Pot

The span pot is located to the right of the zero pot (see Figure 2). 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 gas

response and counterclockwise to decrease the gas response.

CAUTION: The amplifier includes two additional potentiometers. They are factory-set. Do not

adjust them.

Test Points

The test points are on the left side of the amplifier (see Figure 2). The test points produce a 100

mV 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 amplifier’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.

10 • Installation

Installation

This section describes procedures to mount the combustible gas transmitter in the monitoring

environment and wire the transmitter to a controller.

Mounting the Combustible Gas 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. For lighter gases, mount the

detector near the ceiling; for heavier gases, mount the detector near the floor.

Figure 3: Mounting the Combustible Gas Transmitter

2. At the monitoring site you select, hang or mount the junction box with the detector facing

down (see Figure 3).

.20 Dia. x

.45 Slot, 2X

3/4 NPT

Female,

2.40

MPS LEL

Detector

J-Box

3.66

3.15 3.34

1.10

6.80 max

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