Retrotec DM-2 User Manual download pdf (Page 7)

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©Retrotec Inc. 2012

The Fan Speed Control output on the gauge cable uses RS-485 protocol. The Speed Control Cable can

thus extend approximately 1,200 metres (4,000 feet) between the gauge and the fan.

1.1.2 The DM-2 Screen

The Display Screen is where all measurement values are shown, as well as the current status of the

device, and test configuration.

Table 1: DM-2 Gauge Screen

Key

Description

Page for

information

Battery Health

/Baseline Value

Displays the battery health (degree of charge) for rechargeable batteries

only.

If “Baseline” has been activated, a pressure will appear that is deducted

from the “PrA” value.

Jog/Hold

Cycles between inactive as indicated by "- - - - " and "Hold" which will

hold the display and control functions until “Hold” is turned off. “Jog”

will be possible when using Set Speed or Set Pressure.

Displays the current value of the slope of the line along which

@Pressure estimates are extrapolated. Can be set between 0.50 and

1.00. A value of 0.65 is suggested for houses, 0.60 for ducts and 0.55 for

leaky buildings with large holes and for large buildings.

Time

Displays the current Time Averaging setting: Off, 1s, 2s, 4s, 8s, 10s, 20s,

1m, 2m.

Zero

Displays the current Auto Zero status, On or Off.

Volume/Area

Input

Displays the current surface area, or enclosure volume setting, used for

calculations involving per unit area.

Speed

Displays the current fan speed as a percentage

Device

Displays the current fan (also known as the Device). This must match

the fan that is in use.

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Retrotec DM-2 User Manual Page 7