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1. Introduction
The ADT681 is designed to offer a truly compact, cost effective digital pressure gauge to cover a wide range of
applications. Along with its pressure measuring functions, it can be used as a calibration standard for calibration of
standard pressure gauges, precision pressure gauges, industry pressure gauges, blood pressure meters and other
pressure instruments.
The ADT681 digital pressure gauge uses a 9V battery (ANSI/NEDA 1604A or IEC 6LR61) or a special DC9V adapter
power supply.
The ADT681 digital pressure gauge is electromagnetic compatibility (EMC) tested to be used in a variety of
electromagnetic environments. In addition, it is certified by European CE standard.
The ADT681 digital pressure gauge has two types: the standard type and the intrinsically safe type (ADT681IS).
The ADT681IS includes the following intrinsic safety approvals:
The Additel 681 has the optional data logging function.
II 1 G Ex ia IIC T4 Ga
,,Permitted for zone 0, Equipment Group II Gas Group IIC hazardous atmospheres temperature class T4
f:This product con orms to the following standards
EN 60079-0:2009 EN 60079-11:2007
256807
Ex ia IIC T4
Class I, Zone 0, DIV1 Groups A, B, C and D
Ta= -10 to 50℃+ ℃
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