Teledyne 2240 - Portable Handheld Hydrogen Leak Detector, 3rd generation (revision 2/29/08) - Manual (Page 20)

Startup and Operation Model 2240
Teledyne Analytical Instruments 10
Figure 2-6: Peak Hydrogen Detected LED
2.7 Keypad
The keypad is used to alter the display or initiate special functions
as follows:
• Pressing ▲ (up arrow button) will display the peak hydrogen
reading.
• Pressing ▼ (down arrow button) will display the current
percent hydrogen concentration.
• Pressing ► (right arrow button) will clear the peak hydrogen
value.
• Pressing and holding ◄ (left arrow button) will invoke the
Zero Operation (see Section 2.10).
• Pressing and holding ◄ ► (left and right arrow buttons
simultaneously) will invoke the Reset operation (see Section
2.9).
• Pressing and holding the ENTER button will invoke the
Configuration Menu (see Section 2.11).
2.8 Controller LCD Error Status
The following Error Messages can appear on the display: