1. INTRODUCTION
Page 7
© 1995 - 2010 Fluke Corporation, DH Instruments Division
Table 1.
molbloc-L Pressure Dependent Calibration Types
CALIBRATION TYPE
(CALIBRATION NAME)
OPERATING PRESSURE
NOMINAL DIFFERENTIAL
PRESSURE AT MAX. FLOW
1E5
MOLBLOC
ALL OTHER
MOLBLOCS
Low pressure
(LOP)
200 to 325 kPa absolute
(29 to 48 psia)
upstream
of molbloc
5 kPa
(.725 psi)
50 kPa
(7.5 psi)
High pressure
(HIP)
325 to 525 kPa absolute
(48 to 76 psia)
upstream
of molbloc
Not available
50 kPa
(7.5 psi)
Downstream
(DOWN)
Atmospheric pressure
downstream
of molbloc. 85 to
105 kPa (12 to15 psia).
12.5 kPa
(1.8 psi)
80 kPa (12 psi)
Note
Differential pressure values are nominal and may vary by up to
15 % with the actual molbloc used.
1.2.5.1.4
molbloc-L Ranges with Low Pressure and
Downstream Calibrations
Table 2.
molbloc-L Ranges with Low Pressure and Downstream Calibrations
molbloc-L SIZE AND FULL SCALE FLOW (sccm @ 0 ºC)
GASES
SIZE
1E1
SIZE
5E1
SIZE
1E2
SIZE
2E2
SIZE
5E2
SIZE
1E3
SIZE
5E3
SIZE
1E4
SIZE
3E4
SIZE
1E5
INE
RT
Nitrogen
N
2
10
50
100
200
500
1,000
5,000
10,000
30,000
100,000
Argon
Ar
10
50
100
200
500
1,000
5,000
10,000
30,000
80,000
Helium
He
10
50
100
200
500
1,000
5,000
10,000
30,000
100,000
Sulfur Hexafluoride
SF
6
10
50
100
200
500
1,000
2,000
500
6,000
1,000
6,000
4,000
---
---
Xenon
XE
10
40
80
150
400
800
3,500
500
8,000
11,000
3,000
30,000
20,000
F
L
A
M
M
A
B
L
E
Butane
C
4
H
1
0
20
100
130
30
270
50
670
140
2,300
2,200
1,400
7,000
3,000
---
---
---
---
Ethane
C
2
H
6
20
100
200
400
1,000
2,000
6,000
1,000
18,000
2,000
18,000
6,000
60,000
50,000
Ethylene
C
2
H
4
16
80
160
320
800
1 600
7,000
1,000
16,000
20,000
5,000
70,000
40,000
Hydrogen
H
2
20
100
200
400
1,000
2,000
10,000
20,000
60,000
200,000
Methane
CH
4
16
80
160
320
800
1 600
8,000
16,000
40,000
5,000
120,000
40,000
Propane
C
3
H
8
20
100
200
400
1,000
2,000
3,000
1,000
10,000
2,000
10,000
7,000
---
---
F
L
U
O
R
O
-
CARBO
NS
Carbon
Tetrafluoride
CF
4
10
50
100
200
500
1,000
4,000
600
10,000
12,000
3,000
36,000
25,000
Hexafluorethene
C
2
F
6
10
50
100
200
500
1,000
2,000
600
6,000
1,200
6,000
4,000
---
---
Trifluoromethane
CHF
3
10
50
100
200
500
1,000
4,000
600
10,000
12,000
4,000
38,000
30,000
O
T
H
E
R
Air
Air
10
50
100
200
500
1,000
5,000
10,000
30,000
100,000
Carbon Dioxide
CO
2
10
50
100
200
500
1,000
5,000
10,000
20,000
4,000
60,000
30,000
Carbon Monoxide
CO
10
50
100
200
500
1,000
5,000
10,000
30,000
100,000
Nitrous Oxide
N
2
O
10
50
100
200
500
1,000
5,000
10,000
20,000
4,000
60,000
30,000
Octafluorocyclobutane
1
C
4
F
8
15
60
9
65
17
130
34
330
85
1,100
175
1,050
840
3,400
1,700
---
---
Oxygen
O
2
10
50
100
200
500
1,000
5,000
10,000
30,000
80,000
See Table 3 for footnotes.
