3 The level bubble is not
visible or is extended and
exceeds the bounds of
the middle lines of the vial
The level is out of
order
Replace it with a fit
one
4 The lamp fails to light
The lamp is burnt
Replace it with that in
good order
9 RULES OF STORAGE
After operation with the device one should clean the outer surfaces of the optical pieces against dust
and moisture, put caps on the eyepieces and put cover on the device or place the device in the packing
case.
All the places of the device which are no bar to penetration of moisture and dust inside are filled up
with special watertight putty, therefore it should be seen that this putty is always in good order. The
unpainted parts of the device - the tripod pin, the headrest pin and so on - should be coated with a thin
layer of grease to avoid corrosion.
The mechanical parts of the packing cases should be slightly greased to avoid rusting. All accessories
and spare parts are to be put in their mortizes in the cases when in storage.
It is not permitted to store the device on the floor, near stoves, at the windows.
The premises where the device is stored must be dry and heated.
The air temperature in the premises must be not lower than 5 °C and relative humidity at a temperature
of (25±10) °C must not exceed 70 %.
The tripod is stored together with the device complete set.
The alkaline accumulators are stored in compliance with the maintenance instructions on
accumulators.
10 ACCEPTANCE CERTIFICATE
Binocular observation device PNB-3 (PNB-3-1), serial No. , is in compliance with technical
requirements and found fit for service.
Date of issue ____________________________
Signatures ______________________________
(stamp)
Federation State Unitary Enterprise
Production Amalgamation “Novosibirsk Instrument-Making Plant”
179/2, D.Kovalchuk,
Novosibirsk, 630049
Russian
Supplement 1
RESTORATION OF ABSORBING CAPACITY OF SILICA GEL
For restoration of absorbing capacity of silica gel it is necessary to screw out the cap from the
desiccator, pour silica gel in a clean metal vessel which is put on the heat source (an electric stove, coals
of a bonfire and so on).
The direct contact of silica gel with the flame is to be avoided.
