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DM32X
Retrotec DM32X User Manual
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© Retrotec
2022
Tip:
Box pressure of 8 Pa or less
is
recommended because higher pressures will decrease the exhaust f
an flow rate.
Box pressures below 3 Pa are less accurat
e because small fluctuations in pressure will a
ffect the flow a lot. One Pa is a
practical limit for measuri
ng flow, below which readin
gs cannot be taken.
Try the same fan wi
th different holes to se
e
the different results.
76
78
Table of Contents
Table of Contents
4
Important Equipment-Related Safeguards
7
Introducing the Retrotec DM32X Digital Gauge
8
Gauge Overview
9
Make Connections to the Gauge
9
Charge the Battery in the Gauge
10
Power the Gauge on and off
11
Read Results and Control the Gauge from the DM32X Gauge App Home Screen
11
Observe Icons to Monitor Gauge Status
12
What Speed Is Being Sent to the Fan on the "Fan Speed" Output
12
Over What Time Period Is the Result Being Averaged
12
Result Display Can be Frozen to Write down Values
13
How Much Battery Life Is Left in the Gauge
13
Use Keys on the Home Screen to Control Gauge Operation
13
Channel A] Pressure Reading
13
Channel B] Pressure Reading or Result
14
Set the [Range/Device] Connected to the Gauge
14
Estimate Results with [@ Pressure]
16
Setting "N Value" for @Pressure Extrapolation
17
Capture and Apply a Baseline Using [Settings]
17
Gauge Compensates for Sensor Drift with Auto Zero
17
Get Results Directly from the Gauge
18
Connect Speed Control Cable between the Gauge and Fan
18
Connect Pressure Tubes to Gauge
18
Control the Test and Read Results on the Home Screen
18
Tap [Range/Device] to Match Range on Device in Use
18
Tap [Range/Device] [Change Device] to Change Device in Use
19
Tap [Set Speed] to Run the Fan at a Particular Speed
19
Tap [Jog] Keys to Adjust Speed up or down Incrementally
20
Tap [Set Pressure] to Achieve a Particular Enclosure Pressure
20
Tap [Area] or [Volume] to Enter Dimension for Particular Results
21
Tap "Hold" to Hold Readings and Results
22
Tap [Channel B] or [Settings] to Change Result or Units to be Displayed
22
Tap [@ Pressure] to Estimate Result at a Different Pressure
23
Change [Settings] for Gauge Operating Parameters
26
Capture [Baseline] Pressure
26
Set [Area] if Using a Result Per Area
27
Set [Volume] if Using ACH
28
Use Metric Units for Dimensions
29
Set the [Default @ Pressure]
30
Set [Time Averaging] Period
32
Change Result and Units to be Displayed
33
Set up Ethernet Connection
34
View and Update the [Firmware] Version, Check Serial Number
34
Reset Gauge
35
Remotely Run Tests and Save Results with Retrotec Software
36
Connect Single Gauge to a Computer with Ethernet Cable
36
Connect Multiple Gauges to a Computer Via Wifi Hotspot, USB Tethering, or Bluetooth
37
Connect Computer or Phone to the DM32X "Wifi" Hotspot
37
Make the DM32X Join an Existing "Wifi" Network
39
Run a Test Using Rcloud from the DM32X Gauge
39
Firmware Updates & Embedded Resources
41
Rresources App
42
Verify Your Gauge Accuracy between Factory Calibrations
45
What to Do if You Have Trouble with the Gauge
48
Pressing Power Button May Not Turn Gauge on if Battery Is Fully Discharged
48
Calculated Result will be Wrong if the Range and Device Installed on Fan Are Different than those Selected on the Gauge
48
Moving Tubes Might Cause Fluctuating Pressure Readings
49
Fans with a Single Tube Have Results Adjusted by Gauge
49
Pressure Can Overshoot When Using the Set Pressure Key
50
Check if Large Fixed Errors Are Caused by Pinched Tubes
51
Check if Large Fixed Errors Are Caused by Water in the Tube
51
Check if Large Fixed Errors Are Caused by Sun Heating the Tubes
52
Check if Wind Is Causing Fluctuating Pressure
52
Use the [@ Pressure] Key to Reduce the Effects of Wind
52
Use Time Averaging Feature to Reduce the Effects of Wind
52
Let Time Averaging Take Effect before Making Readings
53
Use Baseline Feature to Reduce the Effects of a Constant Wind
53
Technical Specifications
55
Appendix A: Understanding Pressures on the Gauge
57
Differential Pressure
57
Positive Vs. Negative Pressure
57
Why Static and Fluctuating Pressures Occur, Causing Bias
58
Managing Fluctuating Pressures Created by Wind
58
Reduce Uncertainty in Results by Taking Lots of Readings
59
Appendix B: Flow Equations Used with Devices
60
Appendix C: Manually Estimate Flow if Required Test Pressure Cannot be Reached
65
Cannot Reach 50 Pa Factors
66
Cannot Reach 25 Pa Factors
67
Appendix D: Details about the @Pressure Extrapolation Function
68
N Value" for @Pressure Extrapolation
69
Errors Occur in Estimated Flow if Gauge and Actual "N" Don't Match
70
Appendix E: Tables to Adjust Flow Values for Temperature Difference
73
Appendix F: Tables to Correct Flow if Range Selected DID Not Match the Installed Range
75
Appendix G: Measure Supply or Exhaust Flow with a Gauge and Box
76
Glossary
78
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Retrotec DM32X Specifications
General
Brand
Retrotec
Model
DM32X
Category
Measuring Instruments
Language
English
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