Retrotec DM32X - Page 72

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Flow = C ×

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The graph of pressure versus flow will be linear if graphed on a log-log scale, and the slope will be n.

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Table of Contents4
Important Equipment-Related Safeguards7
Introducing the Retrotec DM32X Digital Gauge8
Gauge Overview9
Make Connections to the Gauge9
Charge the Battery in the Gauge10
Power the Gauge on and off11
Read Results and Control the Gauge from the DM32X Gauge App Home Screen11
Observe Icons to Monitor Gauge Status12
What Speed Is Being Sent to the Fan on the "Fan Speed" Output12
Over What Time Period Is the Result Being Averaged12
Result Display Can be Frozen to Write down Values13
How Much Battery Life Is Left in the Gauge13
Use Keys on the Home Screen to Control Gauge Operation13
Channel A] Pressure Reading13
Channel B] Pressure Reading or Result14
Set the [Range/Device] Connected to the Gauge14
Estimate Results with [@ Pressure]16
Setting "N Value" for @Pressure Extrapolation17
Capture and Apply a Baseline Using [Settings]17
Gauge Compensates for Sensor Drift with Auto Zero17
Get Results Directly from the Gauge18
Connect Speed Control Cable between the Gauge and Fan18
Connect Pressure Tubes to Gauge18
Control the Test and Read Results on the Home Screen18
Tap [Range/Device] to Match Range on Device in Use18
Tap [Range/Device]  [Change Device] to Change Device in Use19
Tap [Set Speed] to Run the Fan at a Particular Speed19
Tap [Jog] Keys to Adjust Speed up or down Incrementally20
Tap [Set Pressure] to Achieve a Particular Enclosure Pressure20
Tap [Area] or [Volume] to Enter Dimension for Particular Results21
Tap "Hold" to Hold Readings and Results22
Tap [Channel B] or [Settings] to Change Result or Units to be Displayed22
Tap [@ Pressure] to Estimate Result at a Different Pressure23
Change [Settings] for Gauge Operating Parameters26
Capture [Baseline] Pressure26
Set [Area] if Using a Result Per Area27
Set [Volume] if Using ACH28
Use Metric Units for Dimensions29
Set the [Default @ Pressure]30
Set [Time Averaging] Period32
Change Result and Units to be Displayed33
Set up Ethernet Connection34
View and Update the [Firmware] Version, Check Serial Number34
Reset Gauge35
Remotely Run Tests and Save Results with Retrotec Software36
Connect Single Gauge to a Computer with Ethernet Cable36
Connect Multiple Gauges to a Computer Via Wifi Hotspot, USB Tethering, or Bluetooth37
Connect Computer or Phone to the DM32X "Wifi" Hotspot37
Make the DM32X Join an Existing "Wifi" Network39
Run a Test Using Rcloud from the DM32X Gauge39
Firmware Updates & Embedded Resources41
Rresources App42
Verify Your Gauge Accuracy between Factory Calibrations45
What to Do if You Have Trouble with the Gauge48
Pressing Power Button May Not Turn Gauge on if Battery Is Fully Discharged48
Calculated Result will be Wrong if the Range and Device Installed on Fan Are Different than those Selected on the Gauge48
Moving Tubes Might Cause Fluctuating Pressure Readings49
Fans with a Single Tube Have Results Adjusted by Gauge49
Pressure Can Overshoot When Using the Set Pressure Key50
Check if Large Fixed Errors Are Caused by Pinched Tubes51
Check if Large Fixed Errors Are Caused by Water in the Tube51
Check if Large Fixed Errors Are Caused by Sun Heating the Tubes52
Check if Wind Is Causing Fluctuating Pressure52
Use the [@ Pressure] Key to Reduce the Effects of Wind52
Use Time Averaging Feature to Reduce the Effects of Wind52
Let Time Averaging Take Effect before Making Readings53
Use Baseline Feature to Reduce the Effects of a Constant Wind53
Technical Specifications55
Appendix A: Understanding Pressures on the Gauge57
Differential Pressure57
Positive Vs. Negative Pressure57
Why Static and Fluctuating Pressures Occur, Causing Bias58
Managing Fluctuating Pressures Created by Wind58
Reduce Uncertainty in Results by Taking Lots of Readings59
Appendix B: Flow Equations Used with Devices60
Appendix C: Manually Estimate Flow if Required Test Pressure Cannot be Reached65
Cannot Reach 50 Pa Factors66
Cannot Reach 25 Pa Factors67
Appendix D: Details about the @Pressure Extrapolation Function68
N Value" for @Pressure Extrapolation69
Errors Occur in Estimated Flow if Gauge and Actual "N" Don't Match70
Appendix E: Tables to Adjust Flow Values for Temperature Difference73
Appendix F: Tables to Correct Flow if Range Selected DID Not Match the Installed Range75
Appendix G: Measure Supply or Exhaust Flow with a Gauge and Box76
Glossary78

Retrotec DM32X - Page 72

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