Retrotec DM-2A User Manual download pdf (Page 58)

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©Retrotec Inc. 2012

Appendix B: Cannot Reach @ Pressure Factors

Cannot Reach 50 Pa Factors

Take CFM reading at pressure achieved and multiply by "Cannot reach 50 factor" to get pressure at 50

Pa. e.g. read 1000 CFM at building pressure of 30 Pa. Factor is 1.36,

1000 x 1.36 = 1360 CFM

Table 10. Factors for when a building pressure of 50 Pa cannot be reached (“n” value of 0.65).

Pressure

achieved

Cannot reach

50 factor

Pressure

achieved

Cannot reach

50 factor

1.00

1.57

1.01

1.61

1.03

1.66

1.04

1.71

1.06

1.76

1.07

1.81

1.09

1.88

1.10

1.94

1.12

2.02

1.14

2.10

1.16

2.19

1.18

2.29

1.20

2.40

1.22

2.53

1.24

2.68

1.26

2.85

1.28

3.05

1.31

3.29

1.34

3.59

1.36

3.97

1.39

4.47

1.42

1.46

1.49

1.53

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 64 65 66

DM-2 Operation Manual 1
Page 2 of 66 2
Table of Contents 3
List of Tables 5
List of Figures 5
Differential Pressure 6
Page 7 of 66 7
Analog Gauges 8
2 DM-2 Digital Gauge Basics 9
2.2 Gauge Overview 12
The DM-2 Screen 13
2.3 Resetting the Gauge 14
2.4 Screen Contrast 15
3 DM-2 Keypad Functions 16
Baseline 18
Time Avg 19
Auto Zero 19
Set Pressure 20
Set Speed 20
Jog/Hold 20
@ Pressure 21
Page 22 of 66 22
Page 23 of 66 23
4.1 Making the Connections 24
Hardware connections 25
4.2 Conducting a Basic Test 26
5 Gauge set up 27
Full Screen Timeout 28
Restore Settings 28
Language 28
Battery Type 29
Display Version Info 29
Power Down Hour 31
Surface Area Unit 31
Building Volume Unit 32
European , Separator 32
Sig Figs 32
5.2 Device Setup 33
Enable and Disable Devices 35
5.3 Mode Setup 37
Page 40 of 66 40
Page 41 of 66 41
Page 42 of 66 42
6 Field Calibration 43
7 Troubleshooting 45
Page 48 of 66 48
7.6 Large fixed errors 49
Page 50 of 66 50
7.9 Windy conditions 51
Page 53 of 66 53
7.12 Updating Firmware 54
Page 57 of 66 57
Cannot Reach 50 Pa Factors 58
Cannot Reach 25 Pa Factors 59
Appendix C: Exponent Errors 62
Page 63 of 66 63
Glossary 64

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