Retrotec DM-2A Manuel d'utilisateur

Retrotec Inc. 1060 East Pole Rd. Everson, WA USA 098247 Ph. 360-738-9835 Retrotec Inc. DM-

Page 10 of 66 ©Retrotec Inc. 2012 To install batteries for the first time 1. Using a small Phillips screwdriver, open the lower back panel of the DM

Page 11 of 66 ©Retrotec Inc. 2012 To view the remaining battery power: The DM-2 features a battery health indicator, displaying the current status of

Page 12 of 66 ©Retrotec Inc. 2012 2.2 Gauge Overview The Retrotec DM-2 mark II gauge has: a connections panel, a display screen, and a keypad. The co

Page 13 of 66 ©Retrotec Inc. 2012 The DM-2 Screen The Display Screen is where all measurement values are shown, as well as the current status of th

Page 14 of 66 ©Retrotec Inc. 2012 The Keypad The DM-2 keypad provides access to all DM-2 settings and controls. Some keys have multiple functions. K

Page 15 of 66 ©Retrotec Inc. 2012 2.4 Screen Contrast Older model DM-2s include the ability to change the screen contrast in order to improve visibi

Page 16 of 66 ©Retrotec Inc. 2012 3 DM-2 Keypad Functions The DM-2 Keypad has 14 keys which control all of the DM-2 functions. On/Off (Backlight)

Page 17 of 66 ©Retrotec Inc. 2012 Mode The DM-2 mark II can display measurements and calculate results in a variety of units. The top result line (“P

Page 18 of 66 ©Retrotec Inc. 2012 Setup The Setup key allows access to the Setup Menu, where the gauge is customized. For more information about navi

Page 19 of 66 ©Retrotec Inc. 2012 To establish a baseline pressure 1. Press [Baseline] to begin acquiring the background pressure. The gauge display

Page 2 of 66 ©Retrotec Inc. 2012 Copyright © 2012 Retrotec Inc. All rights reserved. This document contains materials protected under International a

Page 20 of 66 ©Retrotec Inc. 2012 Set Pressure The DM-2 can automatically control the fan speed on ‘Q’ model systems to achieve a user set building p

Page 21 of 66 ©Retrotec Inc. 2012 The screen will display either "- - - - " or "Hold".To activate Hold 1. Press [Jog/Hold] unti

Page 22 of 66 ©Retrotec Inc. 2012 The @ Pressure function provides unique advantages over un-extrapolated results:  There's no need to achieve

Page 23 of 66 ©Retrotec Inc. 2012 Example #3 - Set Pressure The gauge is set up to measure flow in CFM, with the @ Pressure setting @50 Pa. The DM-2

Page 24 of 66 ©Retrotec Inc. 2012 4 Using the DM-2 Gauge for Testing The DM-2 can be used for testing either on its own, or connected to a specializ

Page 25 of 66 ©Retrotec Inc. 2012 Hardware connections  Speed Control – Connects the DM-2 gauge to the fan using an Ethernet style cable. CAUTION:

Page 26 of 66 ©Retrotec Inc. 2012 The Retrotec DM-2 can be connected to Minneapolis's Model 3 and Model 4 fans. To connect the DM-2 to a Minneap

Page 27 of 66 ©Retrotec Inc. 2012 5 Gauge set up While the DM-2 can be run using the default settings, configuring the DM-2 for a specific fan syst

Page 28 of 66 ©Retrotec Inc. 2012 Full Screen Timeout DM-2s that have firmware Version 3.0 or higher, have a large format screen, which automaticall

Page 29 of 66 ©Retrotec Inc. 2012 To change the language 1. Press [Setup] to access the Setup menu. 2. Press [] or [] to select "Language&q

Page 3 of 66 ©Retrotec Inc. 2012 Table of Contents 1 UNDERSTANDING THE PRESSURE GAUGE ...

Page 30 of 66 ©Retrotec Inc. 2012 n The “n” value is typically 0.65 for houses and 0.60 for ductwork. A wide open hole has an n of 0.5, meaning that

Page 31 of 66 ©Retrotec Inc. 2012 However, if it was known that n was 0.7, the flow at 25 should have been:     

Page 32 of 66 ©Retrotec Inc. 2012 3. Press [] or [] to select the desired units. Building Volume Unit For air change per hour results, volume me

Page 33 of 66 ©Retrotec Inc. 2012  3.0 Three significant figures.  3.5 Three significant figures plus a fourth figure rounded to either 0 or 5. T

Page 34 of 66 ©Retrotec Inc. 2012 Model 200 Fan 600 Fan 900 Fan 1000 Fan 2000 Fan 3000 Fan Mn Duct Blaster B Mn Model 3/4 Fan Mn Exhau

Page 35 of 66 ©Retrotec Inc. 2012 Enable and Disable Devices To simplify the device selection process, it's possible to disable devices that wil

Page 36 of 66 ©Retrotec Inc. 2012 Enable and Disable Flow Range Configurations It is also possible to enable and disable Flow Ranges for each of the

Page 37 of 66 ©Retrotec Inc. 2012 5.3 Mode Setup The DM-2 gauge is set to use a preset unit measurement configuration for each of the available modes

Page 38 of 66 ©Retrotec Inc. 2012 5.4 Setting up your DM-2 for a NFPA Enclosure Integrity Test For a test to comply with the NFPA 2001, test results

Page 39 of 66 ©Retrotec Inc. 2012 5.5 Performing an NFPA 2001 Enclosure Integrity Test (single point test as per 2008 edition) For an Enclosure Inte

Page 4 of 66 ©Retrotec Inc. 2012 Enable and Disable Devices ...

Page 40 of 66 ©Retrotec Inc. 2012 Achieve the Target Pressure (Method 1) – Using Set Pressure 1. Press [Set Pressure] and enter the target pressure

Page 41 of 66 ©Retrotec Inc. 2012 5.6 Using the DM-2 to look for the locations of Leaks If your test does not comply (e.g. the retention time is les

Page 42 of 66 ©Retrotec Inc. 2012 5.7 Setting up for a test with Alaska’s AkWarm software 1. Press [Setup] to enter the Setup menu 2. Press [] or

Page 43 of 66 ©Retrotec Inc. 2012 6 Field Calibration Gauge Calibration To verify the calibration of a gauge, the easiest method is to compare the

Page 44 of 66 ©Retrotec Inc. 2012 When performing a gauge calibration with two gauges, if one gauge is known to be calibrated accurately, it can be u

Page 45 of 66 ©Retrotec Inc. 2012 7 Troubleshooting After getting a clear understanding of what pressure is and how it's measured, knowing the

Page 46 of 66 ©Retrotec Inc. 2012 7.1 DM-2 Rechargeable Battery Problems The DM-2 is designed to recharge NiMH batteries in the gauge, eliminating th

Page 47 of 66 ©Retrotec Inc. 2012 7.2 Serial Number and Calibration Date Check It's recommended to check the serial number and calibration date

Page 48 of 66 ©Retrotec Inc. 2012 7.4 Wind causes a fluctuating pressure A wind blowing across the tip of a tube can cause significant error, even if

Page 49 of 66 ©Retrotec Inc. 2012 In extreme cases, wind dampening kits split the main pressure pickup point into either two or four directions, whic

Page 5 of 66 ©Retrotec Inc. 2012 List of Tables Table 1. DM-2 Gauge keys and functions. ...

Page 50 of 66 ©Retrotec Inc. 2012 Water can also cause significant errors if a drop is pulled into the pressure tubes. It is very easy to get a water

Page 51 of 66 ©Retrotec Inc. 2012 7.8 No reference tube while pressurizing Model 1000, 2000, and 3000 fans are automatically referenced by the gauge

Page 52 of 66 ©Retrotec Inc. 2012 7.10 Pressure overshoots when using the Set Pressure key When Set Pressure is used to establish 60 Pa for example,

Page 53 of 66 ©Retrotec Inc. 2012 7.11 The keys on the DM-2 Keypad are not working If the DM-2 will power on, but one or more keys do not work, the

Page 54 of 66 ©Retrotec Inc. 2012 7.12 Updating Firmware If the DM-2 has firmware 3.0 or higher, it will be possible to update the firmware online i

Page 55 of 66 ©Retrotec Inc. 2012 Appendix A: System Flow Equations for all Devices The following equation can be used to determine flow, using the v

Page 56 of 66 ©Retrotec Inc. 2012 Range N K K1 K2 K3 MF Mn Model 3 230 V Open 0.4918 498.9000 0.000 1.0 0.0000 25 A 0.4889 190.1000 0.000 1.0 0.000

Page 57 of 66 ©Retrotec Inc. 2012 Table 9. N and K coefficients for all DM-2 supported fans, Obsolete. Range N K K1 K2 K3 MF DU100 Open 0.4910 39.48

Page 58 of 66 ©Retrotec Inc. 2012 Appendix B: Cannot Reach @ Pressure Factors Cannot Reach 50 Pa Factors Take CFM reading at pressure achieved and mu

Page 59 of 66 ©Retrotec Inc. 2012 Cannot Reach 25 Pa Factors Take CFM reading at pressure achieved and multiply by "Cannot reach 25 Pa factor&q

Page 6 of 66 ©Retrotec Inc. 2012 1 Understanding the Pressure Gauge A high-performance digital differential pressure gauge offers a number of advant

Page 60 of 66 ©Retrotec Inc. 2012 Appendix C: Temperature Correction Temperature correction is only required when there is a temperature difference a

Page 61 of 66 ©Retrotec Inc. 2012 temperature difference. Software sourced from another vendor will need to be checked to verify whether or not this

Page 62 of 66 ©Retrotec Inc. 2012 Appendix C: Exponent Errors If a gauge is set to an exponent value (“n”) but the actual exponent (the true exponen

Page 63 of 66 ©Retrotec Inc. 2012  Achieved pressure is the actual maximum pressure achievable in the ducts  

Page 64 of 66 ©Retrotec Inc. 2012 Glossary Term Definition Air Current Tester Neutrally buoyant smoke (manufactured by Retrotec Inc.) used to locate

Page 65 of 66 ©Retrotec Inc. 2012 Term Definition effective leakage area A common term used to describe air flow at a pressure by equating it to an

Page 66 of 66 ©Retrotec Inc. 2012 Term Definition NFPA National Fire Protection Association outdoors Outside the building in the area around the buil

Page 7 of 66 ©Retrotec Inc. 2012 Positive vs. Negative Pressure The DM-2 gauge will display pressures from -1250 Pa to + 1250 Pa. A higher pressure

Page 8 of 66 ©Retrotec Inc. 2012 Analog Gauges Retrotec no longer manufactures or sells analog gauges. It is recommended that Door Fan systems using

Page 9 of 66 ©Retrotec Inc. 2012 2 DM-2 Digital Gauge Basics The DM-2 is Retrotec’s digital micromanometer. It combines simple but comprehensive fu