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Gas Detection You Can Trust
Part Nos.
S01749
96HD/FL
S01750
96HD/HS
S01751
96HD/CO
S01752
96HD/AM
S01753
96HD/OX
S01754
96HD/TC
96HD
Sensor Housing
Installation, operating and maintenance
instructions, MO7181
1. INTRODUCTION
1.1 Product overview
The 96HD sensor housing is a modular stainless steel
assembly which dismantles to allow plug in sensors to be
replaced easily. The 96HD can accommodate flammable,
thermal conductivity, toxic and oxygen sensors. It is used
throughout Crowcon's range of gas detectors and may also
be used to replace older gas detectors previously
manufactured by Crowcon or its' competitors. Once
assembled the 96HD is certified EEx d IIC T6 and may be
used in a zone 1 or 2 hazardous area when terminated in a
suitable certified junction box.
1.2 Product description
Diagrams 1, 2 and 3 detail the 96HD sensor housing.
m m
M 2 0 t h r e a d
96HD
6 0 m m
7 2 m m
EEx d IIC T6 (amb -40
o
C/+55
o
C)
II 2G
( o v e r a l l l e n g t h
Cert. No. Sira 02 ATEX 1283X
w h e n f i t t e d
Year 01 Construction XXXX
1180
t o j u n c t i o n b o x
3 9 m m d i a m e t e r
Diagram 1: 96HD dimensions
1
2. ELECTRICAL CONNECTIONS
The 96HD is supplied with either 2, 3 or 4, colour coded, flying wires
depending on the sensor fitted. Wires must be terminated at an
Sensor type
Electrical connections
and part number
Pellistor
Detector
S01-637/letter
Common
A
VQ21T
Reference
B
300P
C
VQ8
D
VQ16
Resistors
E
VQ22
Detector
F
VQ25
Det
1k 27R/LR
Common
G
VQ41
Reference
Ref
1k 27R/LR
H
VQ1
Detector
Thermal
Det
conductivity
Common
Ref
Reference
S01-638
Cathode electrode
Cathode
Oxygen
E01-488
Anode electrode
Anode
Toxic
Counter electrode
Counter
E01-229/HS
Sensing electrode
Sensing
E01-344/CO
Ref electrode
Reference
E01-618/AM
Table 1: Application summary.
4
Diagram 2: 96HD sensor housing with flammable sensor.
2
appropriate certified junction box/amplifier and connected in accordance
with the information in Table 1, below.
Amplifier
Notes/applicable products
Red -ve
Flamgard 4/20 (fomerly EXD90/FL)
Green
EXD90/FL
DI9 or DI5/6 replacement (3-wire)
S01-633
96HD (3-wire) used in Flamgard EXE, D, Plus
Black +ve
Yellow
27R used with 73
1
GW, 74 GW, 72FP.
Red
81HD replacement (4-wire)
2
This version is called
Blue
96 HD/LR
LR version used for 73GW, 74GW, 72FP
3
Blk
1k used with 83GW
4
GMS 1,4
Red
EXD90/TC
Blue
TCgard (formerly EXD90/TC)
S01-636
Orange
Red
EXD90/OX
Txgard-D/OX (formerly EXD90/OX)
S01-756
Green
Red
Txgard-D/HS (formerly EXD90/HS)
EXD90/TOX
Green
Txgard-D/CO (formerly EXD90/CO)
S01-755
Blue
Txgard-D/AM (formerly EXD90/AM)
5
Diagram 3: 96HD sensor housing with toxic sensor.
3
3. REPLACEMENT/RETROFIT APPLICATIONS
96HD may be easily retrofitted to any system previously supplied
by Crowcon. This allows customers to upgrade old disposable
detectors to the serviceable 96HD, thus reducing the on going cost of
ownership of the system. While the 96HD is electrically identical to older
products mechanical changes have been essential to obtain certification
to the latest standards. Table 2 summarises the compatibility of the
96HD with older detectors. If the detector you are using is not listed or
you require assistance please contact Crowcon.
Accessories
DI9
*1
DI 5/6
*1
*2
*2
81HD
*1
73HT
n/a
n/a
*1
96HT
n/a
n/a
*1
Table 2: 96HD capability guide
= identical or superior performance
= not directly compatible
Notes:
*1 = Wherever possible dimensions have been maintained to be
compatible with existing accessories.
*2 = Existing accessories may be used with the addition of an adaptor
(Crowcon part no. C01664).
*3 = Contact Crowcon.
6
*3
*3
*3
*3
*3