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TMO2D User’s Manual 19
Chapter 3. Operation
Chapter 3. Operation
3.1 Introduction
This chapter provides information on operating the TMO2D Display. If you have not already done so, please read
Chapter 2, Installation, for details on mounting and wiring the TMO2D display.
WARNING!
To ensure safe operation of the TMO2D, you must install and operate it as described in this manual. In
addition, be sure to follow all applicable safety codes and regulations for installing electrical
equipment in your area. All installation procedures should be performed by trained service
personnel.
3.2 Powering Up
CAUTION!
The interconnecting wiring between the transmitter and display must be completed before powering
up.
To power up the benchtop TMO2D, press the red power key to the right of the display. Other TMO2D models have no
power switch, and begin operating when the external power to which they have been connected has been turned on.
3.3 The User Interface
The electronic display unit contains a 2-line by 24-character backlit Liquid Crystal Display screen (LCD). On
power-up, the display unit tests its memory (RAM), then searches for valid calibration data from the display as well
as input from the transmitter.
If calibration data has already been entered into the display, the unit immediately begins taking measurements from
the transmitter and the LCD begins displaying the gas concentration.
If valid calibration data has not been entered and stored in the display, or if the transmitter is not hooked up to the
display, the LCD will display erroneous readings. (Chapter 4,
Programming the TMO2D Display, explains how to enter
data into the display.)
The TMO2D is operated using the keypad. To facilitate operation, you should familiarize yourself with the display and
keypad functions.
3.3.1 The LCD Display
The first line of the LCD screen displays the current measurement or menu title and a real-time clock. The second line
of the LCD screen displays the measured data on the left and the current alarm condition on the right.
Note: The LCD contains an electroluminescent (EL) panel to enhance readability of the screen during operation. To
activate the EL panel, press any key except the [NO] key.