TM 10-6630-245-13&P
Page
2.6.8.15
Nitrogen as Nitrates Test .....................................................................................
2-50
2.6.8.16
pH Wide Range Test ...........................................................................................
2-51
2.6.8.17
Sulfate Test .........................................................................................................
2-53
2.6.8.18
Turbidity Test .......................................................................................................
2-54
2.6.9
Decals and Instruction Plates ...............................................................................
2-55
2.6.10
Preparation for Movement ....................................................................................
2-55
Section IV.
Operation Under Unusual Conditions....................................................................
2-55
2.7
Unusual Environment/Weather.............................................................................
2-55
2.7.1
General ................................................................................................................
2-55
2.7.2
Heat .....................................................................................................................
2-56
2.7.3
Cold .....................................................................................................................
2-56
2.7.4
Sea and Salt Spray .............................................................................................
2-56
2.7.5
Dust and Sandstorms ..........................................................................................
2-56
2.7.6
High Altitude ........................................................................................................
2-57
2.7.7
High Humidity.......................................................................................................
2-57
2.8
Emergency Procedures ........................................................................................
2-57
2.9
Nuclear, Biological, and Chemical (NBC) Decontamination .................................
2-57
SECTION I.
DESCRIPTION AND USE OF OPERATOR'S CONTROLS AND INDICATORS
2.1. SPECTROPHOTOMETER CONTROLS AND INDICATORS.
The only controls and indicators in the Water Quality Analysis Set-Preventive Medicine (WQAS-PM) are those on the
Spectrophotometer. They are all located on the front panel of the instrument (fig. 2-1).
(1) METER: An analog needle moves in response to the amount of light transmitted through a sample cell. The meter
is read from the printed scale in the background. Different meter scale cards are used for different tests.
(2) METER SCALE CARDS: A set of 16 cards have various scales for the meter. They are stored in a well to the right
of the meter. When using the Spectrophotometer, select the card indicated in the test procedure instructions and slide it
in the slot on the left side of the meter.
(3) WAVELENGTH DIAL: Both a control and an indicator, includes a notched wheel that the operator moves back and
forth to select the wavelength. The scale showing the selected wavelength is a built-in part of the dial. The scale is read
through the clear window to the right of the notched wheel. The selected wavelength is marked by the position of the
indicator line on the clear window. The adjustable wavelength range is 400 to 700 nm.
(4) LIGHT CONTROL KNOB: A rotary knob used to set the light intensity.
(5) ZERO ADJUST KNOB: A rotary knob used to adjust the meter to zero when the light switch is in the ZERO CHECK
position.
(6) LIGHT SWITCH (ON/OFF SWITCH): A three-position toggle switch. The leftmost position is ON. The center
position (straight up) is OFF. The third, rightmost position, is a spring-loaded ZERO CHECK position used when zeroing
the meter.
2-2
