Heath Consultants Detecto Pak-Infrared (DP-I) - Manual (Page 15)

102105-0 DP-IR MANUAL REV M
Page 15 of 35
Alarm Level
The alarm level is the gas concentration that will cause the alarm to sound. Set the alarm level
such that the false alarm rate is low, while not so high that leaks are missed. Your company’s
survey procedure may require the use of a specific value or procedure to set it.
The alarm level can be adjusted in the following steps:
Range (ppm) Increments (ppm) Range (ppm) Increments (ppm)
1-16 1 400-700 50
16-40 2 700-1600 100
40-70 5 4000-7000 500
70-160 10 7000-9000 1000
160-400 20
To change the alarm level:
1. Press the MENU button until the “AL” option is displayed.
2. Press the UP or DOWN button to increase or decrease the threshold. The higher the
threshold setting is, the less sensitive the instrument becomes.
3. Press the MENU button to return to the survey run display.
Detection Modes
The instrument provides two different modes of operation to allow the user maximum flexibility:
• Digital Methane Detection (DMD): no sound will be made until the alarm level is
exceeded. A pulsing tone will then sound as long as the alarm level is exceeded.
The DMD mode is highly sophisticated detection algorithm that greatly
enhances the use of the DP-IR. In most situations, the operator should survey with the
DMD mode turned on.
• Tick mode: a ticking sound will be made that is proportional to the instantaneous gas
concentration. The higher the gas concentration (up to 1000 ppm) the faster the ticking
rate becomes. The Tick mode is the most effective when used to help isolate the highest
gas concentration within a leak area.
To toggle between the DMD and Tick mode:
1. Press the MENU button until the “AL” option is displayed.
2. Press the ZERO button, toggling between DMD and Tick modes.
a. The DMD icon will be shown when in DMD mode
b. The 2 icon will be shown when in Tick mode
3. Press the MENU button to return to the survey run screen.
Using the Tick Mode
To aid in pinpointing a leak, the following procedure can be used:
1. Sweep the probe in and around the leak area.
2. Listen for the fastest tick speed.