Page
59
of
64
8.1 Flowmeter Settings
TYPE IV FLOWMETERS
Set the points to the numbers shown in the table below
Set the fuel and air pressure with the valve open and adjust the oxygen pressure to
achieve the desired flowmeter readings.
Note:
It is not critical that the float tops align exactly with the values given in the chart.
Performance will be adequate
as long as
both
floats are
equally above or below
the value.
The values given in the chart are
before lighting
settings when using
propane
fuel gas.These
values are just a guide. When the pistol is alight flows will fall. This is normal and a result of
increased back pressure within the Nozzle.
WIRE
SIZE
PART NO.
PRESSURES Psi (BAR)
POINTER SETTINGS
(BEFORE LIGHTING)
NOZZLE
SHELL
AIR
NIPPLE
MIXING
BLOCK
SCREWED
INSERT
AIR
(APPOX)
GAS
OXYGEN
GAS
OXYGEN
ZINC & ALUMINIUM STANDARD
3/16” Fast
1281
1302
1271
65 (4.5)
42 (2.9)
66 (4.5)
8.5
7.3
3/16”
Stop/Start
1288/SHELL
1302
1271
1288I
65 (4.5)
42 (2.9)
66 (4.5)
8.5
7.3
2mm
Stop/Start
1293/SHELL
1018
1010
1293I
60 (4.1)
25 (2.7)
39 (2.7)
4.0
3.3
2.3mm
Stop/Start
1293/SHELL
1018
1010
1292I
60 (4.1)
25 (2.7)
39 (2.7)
4.0
3.3
3mm
Stop/Start
1290/SHELL
1020
1270
1291I
60 (4.1)
45 (3.1)
50 (3.4)
4.7
5.2
1/8”
Stop/Start
1290//SHELL
1020
1270
1290I
60 (4.1)
45 (3.1)
50 (3.4)
4.7
5.2
TIN / ZINC ALLOYS (LOW MELTING POINT MATERIALS)
1/8”
1015
1020
1056
60 (4.1)
12 (0.8)
16 (1.1)
2.0
2.0
ALL MATERIALS (FINE SPRAY) SEE NOTE (d)
2mm
1293SHELL
3823
1055
1293I
50 (3.4)
20 (1.4)
30 (2.1)
1.5
1.5
1.5mm
1295/SHELL
3823
1055
1295I
50 (3.4)
20 (1.4)
30 (2.1)
1.5
1.5
The figures shown assume the use of Metallisation Flashback Arrestors. If these are not used, the oxygen pressures
should be adjusted to suit. Since the oxygen pressure is varied to achieve the desired float positions the oxygen
pressures given are approximate.
Summary of Contents for MK 73
Page 1: ...Page 1 of 64 ssue 21 11 11 ...
Page 43: ...Page 43 of 64 SECTION 5 FAULT FINDING 5 1 Troubleshooting 5 1 2 Flowmeter Troubleshooting ...
Page 58: ...Page 58 of 64 SECTION 8 INFORMATION TABLES 8 1 Flowmeter Settings 8 2 Nozzle Selection Chart ...
Page 61: ...Page 61 of 64 Notes ...
Page 62: ...Page 62 of 64 ...
Page 63: ...Page 63 of 64 ...