Toshiba Tohsiba Electromagnetic Flowmeter Converter L5232 - Manual (Page 39)

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Instructions
The operation principle of infrared switch is to irradiate infrared to the
front of control panel and detect the reflection from finger when operating.
Normal operation is impeded depending on the conditions such as
disturbing light from surroundings or stain attached to the control panel.
When unable to avoid such condition, operate the EMF converter in the
following manner.
Remove the factor to impede proper operation of infrared switch as below:
・ Cover the control panel by hand so that light does not shine on it
・ Clean the stain attached on the control panel
・ Clean the stain on the finger or the gloves to operate the EMF
converter, or wear gloves in light color
・ When there is a reflecting object placed opposing to the control panel,
stand in-between the reflecting object and the control panel to block
the light
Following are considered as the factors to impede infrared switch to
operate properly.
・ Intense light such as direct sunlight and reflected sunlight by window
glass or metal plate
・ Place where brightness changes always such as ON/OFF of lighting
・ Dense smoke or steam near the control panel
・ Those attached on the control panel such as rain (dew drop), snow,
ice, mud and oil, and haze due to their attachment
・ Operation of the control panel by hands wearing gloves in dark color
or stained fingers and gloves
・ Light reflecting object near the control panel, or reflecting object such
as metal plate placed opposing to the control panel