TM 5-3610-257-14
(d)
Immersion heater.
(18)
Check blackout switches.
(19)
Plug in emergency lighting and turn switch to READY.
(20)
Adjust air conditioner/heater controls for a section temperature of 75°F ±30F (240C ±20C).
(21)
Check relative humidity with psychrometer as follows:
NOTE
Relative humidity in the section should be at the proper level for photographic processing. Good
conditions are when the section temperature is 750F +30F (240C +20C) and relative humidity is
45% + 3%. Adjust air conditioner controls until the proper temperature and relative humidity is
reached.
(a)
Check water level in cistern.
(b)
Add water to saturate wick and fill cistern.
(c)
Allow 5 minutes to lapse before recording wet and dry bulb readings.
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