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3.1.4 Coding System
Features of Upper Indicator
Scale of Upper Indicator
Features of Lower Indicator
Scale of Lower Indicator
Range selector Switch
Not used
Fitted with Labels
Cubicle Type
Special Features
Mains Supply
The equipment conforms with the requirements of SFA 3012 for class IIC gases to Code Ex (ia) IIC provided that the equipment
is installed in accordance with instructions provided. The display unit and power supply units must be installed in a safe (non-
hazardous) area, and gas analysis panels may be mounted close to the sample point in the hazardous area.
3.1.5 Ordering Code – 6553 Hydrogen Purity and Purge Gas.
A Features of Upper Indicator
6 Two alarms + retrans. 4–20mA
B Scale of Upper Indicator
1 100–85% H
2 100–80% H
3 0–100% Air in CO
85–100% H
4 0–100% Air in CO
80–100% H
5 85–100% H
6 80–100% H
C Features of Lower Indicator
0 Indicator Not Fitted
3 Two alarms + retrans. 4–20mA
D Scale of Lower Indicator
0 Indicator Not Fitted
1 0–100% Air in CO
2 100–85% H
3 100–80% H
4 0–100% Air in CO
85–100% H
5 0–100% Air in CO
80–100% H
6 85–100% H
7 80–100% H
E Range Selector Switch
0 Not fitted
2 Fitted, with facilities for Remote
Indication of Switch Position – upper
ind.
3 Fitted with two range switches, upper
and lower indicator + remote ind.
F Additional Output Signal – Not Used
6553/
X
A
in Air
2
in Air
2
, 0–100% H
in CO
2
2
2
in Air
2
, 0–100% H
in CO
2
2
2
in Air
2
in Air
2
in Air
2
, 0–100% H
in CO
2
2
2
in Air
2
in Air
2
, 0–100% H
in CO
2
2
2
in Air
2
, 0–100% H
in CO
2
2
2
in Air
2
in Air
2
in Air
2
X
X
X
X
B
C
D
E
G Fitted with Labels
1 English
2 French
3 German
H Type of Cubicle
,
1 Without Cubicle.
4 Purge Cubicle (D1)(with purity)
,
5 Purity Cubicle (D2 or D3)(Purity only)
J Special Features
0 None
9 Fitted
K Mains Supply
1 110V, 50/60Hz
2 220V, 50/60Hz
3 240V, 50/60Hz
3.1.6 Option Combinations (6553/[X])
The digit decode is shown in Section 3.1.5.
,
3-Range:
Purity only:
[X]
top ind.
top ind.
,
only
A
6
6
B
1,2,5,6
3,4
C
0
0
D
0
0
E
0
2
F
0
0
G
1 to 3
1 to 3
H
1,5
1,5
J
0,9
0,9
K
1,3
1,3
3 PREPARATION
X
X
X
X
F
G
H
J
Std. purge
2 x purity
2 x 3
system
display
ranges
6
6
6
1,2,5,6
1,2,5,6
3,4
3
3
3
1
2,3,6,7
4,5
2
0
3
0
0
0
1 to 3
1 to 3
1 to 3
1,4
1,5
1,4
0,9
0,9
0,9
1,3
1,3
1,3
X
K
Purity top :
3 ranges
lower
6
1,2,5,6
3
4,5
3
0
1 to 3
1,4
0,9
1,3
7
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