External Dc Operation; Internal Dc Operation - Ametek 303B User Manual

External DC Operation (12Vdc, negative ground, vehicular)
!
This option is available for safe area operation only. Do not attempt to operate this
equipment or charge the battery using this option in a hazardous (classified) location!
WARNING
The 303B is supplied with approximately 12 feet (4m) of low voltage cable, terminated at
one end with a standard vehicular male cigarette/accessory plug. The unterminated end is
to be inserted through the designated 12 V strain relief on the rear panel and terminated
into the AC/DC power board connector at J1 as per Fig. 3.2.
Using the supplied auto lighter plug and cable, connect its black and white leads to J1-5 (+)
and J1-4 (-) respectively. Tighten the strain relief securely so that the dc power lead cannot
be pulled or pushed through the strain relief from the outside.
The plugged end is intended for insertion into the fused, mating con-nector of a 12 VDC,
negative ground vehicle, only. The value of this fuse should be 1A minimum, with a voltage
rating of 18Vor greater. This external connection is not intended to be energized by devices
such as DC power supplies, battery chargers, generators, and the like.
Non-adherence to the above requirements, or use of the equipment in a manner not speci-
!
fied in this manual, may im-pair the protection against fire, electrical shock and damage,
WARNING
originally provided by this equipment.
When the 303B is properly connected to a vehicle, the internal battery will be in a state of
recharge or full charge, maintained by the internal bat-tery charger portion of the power
supply. Note that the front panel AC LED does not illuminate during external DC operation.

Internal DC Operation

The 303B provides an internal 12V, sealed lead acid battery for portable use. There are no
special connections or preparations needed to use this feature.

Note that the front panel AC LED does not illuminate during inter-nal battery use.
NOTE
2. Check that jumper plug JP4 on the display board is set for your reading;
3-4 | 303B Moisture Analyzer Manual
pins 1 and 2 for ppm, pins 2 and 3 for lb/mmscf.