Retrotec DM-2 - Manual (Page 6)

Page 6 of 72
©Retrotec Inc. 2012
DM-2 Digital Gauge Basics
The DM-2 is Retrotec’s two channel digital micromanometer, or differential pressure gauge. It
combines simple but comprehensive functionality, with intuitive
controls and setup. The DM-2 is a dual channel digital gauge that
always displays a pressure on Channel A, but will display either
measured pressure on Channel B, or calculate flow, air changes per
hour, leakage area and display that on Channel B depending on the
Mode selected. To ensure accurate results, the DM-2 takes up to four
pressure readings per second on each channel, and updates the
information displayed on the screen every second.
1.1 Gauge Overview
The Retrotec DM-2 mark II gauge has: a connections panel, a display
screen, and a keypad. The connections panel on the back of the gauge is where all external devices are
connected to the DM-2. The display provides information on the current test mode and/or setup, as
well as the device status and measurement values. The keypad is where the user inputs data to the
DM-2, and operates the DM-2 functions.
1.1.1 The Connections Panel
Figure 1: DM-2 back panel with pressure ports and electrical connections
Electronic function:
1. Control fan speed. (NOT for Internet
connection)
2. Mini USB connection to a PC
3. Reset button
4. Battery charger input
Pressure Ports:
5. Input B (+)
6. Reference B (-)
7. Reference A (-)
8. Input A (+)