TM8400B-L-00
1 November 2004
(i) SUPPRESSION: This 23-position switch is used with the FUNCTION switch in the
READ position to obtain the first two digits in the display during measurement and
standardization. This control acts as a range switch. Whenever the saline sample is
outside the range of the SUPPRESSION switch setting, the display flashes on and off.
This control is adjusted until the display indicates a positive reading and ceases to flash.
(j) FLUSH: This air vent controls the air pressure in the conductivity cell
flushing manifold. Covering the vent with the finger causes the sample water in the
conductivity cell to discharge through the CELL DRAIN spigot.
(k) 115 V/230 V: Located on rear panel, this switch is used to prepare the instrument
power circuits so as to accept either 115 V or 230 V main supply.
(l) DATA LOG: Momentary pushbutton switch provided with the BCD output to
enable a trigger signal for an external device (printer, recorder, computer etc.).
(m) POWER: This switch, located at the rear next to the line cord receptacle, is
normally left on to maintain water bath temperature.
4.3. INDICATORS
(a) DIGITAL DISPLAY: The display is arranged as follows: digit, decimal point,
digit, + or - sign, digit, digit, digit, digit. The position of the FUNCTION switch
determines what is displayed. The decimal point appears only when the FUNCTION
switch is in the READ or ZERO position.
(b) BOTTLE NUMBER: This four-section thumb wheel switch provides a
mechanical numeric display to identify the sample. It is used with the DATA LOG
pushbutton for data logging samples via the BCD OUTPUT connector.
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