9
Reference Air Input
2 Cable Entries, Threaded M16
+ Thermocouple
– Thermocouple
+ Cell Input (Inner)
– Cell Input (Outer)
4.2
Access to Electrical Connections – Fig. 4.1
For access to the terminal block – see Fig.4.1.
4.3
Electrical Connections – Fig. 4.2
Make connections as shown in Fig. 4.2 and on the label inside
the probe head cover. The connecting cable must enter the
probe head via the two M16 cable glands.
4.4
Reference Air Connection – Fig. 4.2
The reference air connector is
1
/
8
in. BSP fitted with an adaptor
to accept
1
/
4
in i.d. x
3
/
8
in o.d. nylon or PVC tubing (100
°
C
ambient maximum).
The probe requires clean, dry air supplied at 100 to 1000cm
3
/hr
(0.2 to 2ft
3
/hr). The air may be regulated instrument air or
preferably atmospheric air from a small pump unit. Suitable air
supply units are available from the Company:
a) Model 003000240 – mains powered pump unit with flow
gauge for use in safe areas only.
b) Model 003000241 – regulated air supply unit for use in
both safe and hazardous areas.
4.5
Routine Maintenance
No maintenance is necessary, or possible, on the probe and
any attempt to dismantle it could cause irreparable damage.
The probe can be tested for accuracy whilst connected to its
measuring system but without removal from its operating
position.
It is recommended that at least one spare probe is held for
replacement or comparison purposes.
Remove
cover
retaining
screws (x3)
Remove gasket
Identify terminal block
Test Gas Connector
(with screwed plug)
1
2
3
4
CONNECTIONS
Table 4.1 Cable and Gland Specifications (electrical requirements only)
e
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6
1
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4
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/
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Ω
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A
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B
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2
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)
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c
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6
1
M
d
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r
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s
ll
a
r
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v
o
,
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e
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p
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,
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.
0
/
6
1
:
t
u
p
n
I
)
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m
(
n
e
g
y
x
O
3
e
c
n
a
t
i
c
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p
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C
µ
8
2
o
i
t
a
R
R
/
L
,
H
m
7
2
.
0
e
c
n
a
t
c
u
d
n
I
,
f
µ
/
H
Ω
'
d
'
d
n
a
l
g
r
e
i
r
r
a
b
d
e
i
f
i
t
r
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C
A
F
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A
B
0
2
M
)
f
o
o
r
p
e
m
a
l
f
(
ATMOSPHERE IS PRESENT
DO NOT OPEN WHEN FLAMMABLE
Fig. 4.1 Access to Electrical Connections
Fig. 4.2 Connections
4.1
Cable and Gland Specifications – Table 4.1
Caution. Cables and glands are not supplied with the probe and must conform to the following requirements:
• The Capacitance and Inductance or Inductance to Resistance (L/R) ratio of the cables connected to the output (hazardous
area terminals) of the zener barriers mounted in the EXGP Interface Electronics Unit must not exceed the values shown.
• All cables must conform to BS5345 for flameproof 'd' type enclosures for mechanical construction.
• EEx d glands used on the Interface Electronics Unit must be of the EEx d 'Barrier Gland' type with BASEEFA certification
because the enclosure is over 2 litres volume, has a source of ignition within and is designed for use in Zone 1 areas
(reference BS5345 part 3).
