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Description, Gas detector, Amplifier set – RKI Instruments Eclipse User Manual

Page 4: View with cover and control pcb removed, View with cover removed

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4

Eclipse Detector Head Operator’s Manual

Description

Figure 1: Eclipse Component Location

The Eclipse consists of the gas detector, amplifier set, and junction box.

Gas Detector

The gas detector senses the target gas and is mounted in a 3/4” conduit hub on the left
bottom side of the Eclipse. The detector type will depend on the target gas and may be one
of the following: combustible gas, oxygen, carbon monoxide (CO), or hydrogen sulfide
(H2S).

The CO and H2S detectors have replaceable sensors. The CO detector includes a charcoal
filter disk which is held onto the sensor with a rubber retaining boot. The charcoal filter
disk scrubs out interfering gases to which the CO sensor responds such as H2S and certain
hydrocarbons.

NOTE:

The combustible gas detector has a 1/2” NPT thread and requires a 3/4” x 1/2”

conduit reducer to mount in the detector hub.

Amplifier Set

The amplifier set converts the electrical output from the detector to a signal which can be
displayed by the LCD display and also to a 4 - 20 mA signal (that is proportional to the
detection range). The 4 - 20 mA signal may be used by a recording device, gas monitor
controller, or programmable controller. The amplifier set consists of two potted printed
circuit board (PCB) assemblies: the interconnect and control PCB’s. The control PCB
includes the LCD display and optical control switch. The interconnect PCB includes the

E CLI P SE

G RN

BLK

B LK

W HT

RED X X X

GRN

WHT

X X X

Cl 2: Y el l ow
S O2 : Oran ge
CO : Red

H2 S : Red

-

+

2 4 VDC

IN

FB

Interconnect PCB

View With Cover and

Control PCB Removed

PATENT
PENDING

E C LI PS E ™ GAS MO N I TO R

3/4" Conduit Hub

View With Cover Removed

Detector (Combustible s hown for ref))

Ribbon Cable Connector (behind nameplate, cable not s hown)

Nameplate

Junction B ox

LCD Display

Control PCB

Optical Switch

Ribbon Cable Connector

Power/Signal T erminal Strip

Sensor Terminal Strip