Martel Electronics BetaGauge 321A-Ex - Manual (Page 3)

1. Introduction
The BETA 311A-Ex/321A-Ex is designed to be a simple to use yet very versatile pressure
calibrator. Its two internal pressure sensors combined with inputs for mA, switch contacts
and an RTD probe allow the 311A-Ex/321A-Ex to calibrate virtually any pressure device.
The BetaGauge 311A-Ex is a single sensor pressure calibrator; the BetaGauge 321A-Ex is
a dual sensor pressure calibrator. The 311A-Ex uses the P1 port for all pressure inputs.
The P2 port is only used on the model 321A-Ex. Therefore on the model 311A-Ex, all
menu choices involving pressure are limited to the P1 port only. All other model 311A-Ex
features and functions are the same as for the 321A-Ex.
1.1 Customer Service
Corporate Office:
www.martelcorp.com
e-mail: [email protected]
Tel: (603) 434-1433 800-821-0023 Fax: (603) 434-1653
Martel Electronics
3 Corporate Park Dr.
Derry, NH 03038
1.2 Standard Equipment
Check to see if your calibrator is complete. It should include: BETA 311A-Ex/321A-Ex
Calibrator, instruction manual, Beta 321A-Ex/311A-Ex Concept Control Drawing (CCD),
test leads, carrying case, calibration certificate with data.
1.3 Safety information
Ex Hazardous Areas
An Ex-hazardous area as used in this manual refers to an area made hazardous by the
potential presence of flammable or explosive vapors. These areas are also referred to as
hazardous locations.
The Model 321A-Ex calibrator has been designed for use in Ex Hazardous Areas. These
are areas where potentially flammable or explosive vapors may occur. These areas are
referred to as hazardous (classified) locations in the United States, as Hazardous
Locations in Canada, as Potentially Explosive Atmospheres in Europe and as Explosive
Gas Atmospheres by most of the rest of the world. The Model 321A-Ex calibrator is
designed as intrinsically safe. This means that connecting the 321A-Ex calibrator to
equipment that is used within intrinsically safe circuits will not cause an ignition capable
arc as long as the entity parameters are suitably matched.
Warning
Check entity parameters before making any connections to this device.
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