RKI Instruments Eclipse - Manual (Page 4)

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