2
SETUP
2
Setup
2.1
Installation
Each B2A Portable is designed to be used in conjunction with a 2A Thermocouple sensor. The 2A
sensor can be mounted in any orientation. The sensor should be mounted close to the area where
vacuum measurement is desired. Each 2A sensor has a key that only allows the sensor end of the
B2A Portable cable to mate with the sensor in the proper orientation. Rotate the sensor end of the
B2A Portable cable until the correct alignment is obtained and the B2A Portable cable is able to slide
onto the 2A sensor. Connect the RJ14 end of the B2A Portable cable into the port on the front of the
B2A Portable. To take a reading using the B2A Portable, turn the left know on the front of the unit to
the "READ" position. When done taking a reading, turn the knob to the "OFF" position.
Try to avoid connecting the 2A sensor to the vacuum chamber by long or narrow piping as this may
affect the accuracy and response time of the unit. Avoid mounting the unit near a heater within the
chamber as this may affect the measurement accuracy. Excessive vibration of the sensor may affect
accuracy and decrease the life of the sensor. Exposure to oils and other contaminants will decrease
the accuracy and decrease the life of the sensor. Do not expose the sensor to corrosive gases.
2.2
Calibration
The B2A Portable controller provides a calibration adjustment to maximize the accuracy of each sen-
sor. The adjustment should be set at 1 mTorr. Maximum accuracy will utilize a 2A sensor and a
NIST traceable reference gauge co-located on a vacuum chamber. A controlled leak of dry nitrogen
is necessary for calibration. All B2A Portable controllers purchased with a 2A sensor will be factory
calibrated and there is no need for adjustment.
For calibration, pump the vacuum chamber down to below 1
×
10
−
4
Torr. Using the leak control
on the vacuum system, adjust the pressure in the chamber until the reference gauge reads 1 mTorr.
Then adjust the left knob on the front of the unit to the "CAL" position. Then adjust the right knob
on the front of the unit until the unit reads 1 mTorr. Change the left knob to OFF or READ to resume
normal operation.
2.3
Charging
The B2A Portable is equipped with a NiCd rechargeable battery. The AC power cable is not necessary
for operating the unit. The battery provides up to 12 hours of use of the unit between charges. The
indicator light, located between the two knobs on the front face of the unit, will turn when the unit
has less than two hours of battery power remaining.
To charge the unit, connect the AC power cable in the rear of the unit and adjust the left knob on
the front of the unit to the "CHG" position. In this position, the unit will charge. Note that the unit only
charges when the knob is in that position. To ensure a full charge, allow the unit 15 hours to charge.
email: [email protected]
tel: +1 215 947 2500
web: frederickscompany.com
b2ap_im rev -
5 of 6
