Introduction Tetra
I.
Introduction
Thank you for purchasing the new Tetra Personal Multigas Monitor. Tetra is a
portable multigas detector, designed to be carried or worn by individuals work-
ing in hazardous environments such as confined spaces. It is suitable for use in
Zone 1 and 2 hazardous areas. Tetra can monitor up to four different gases and
display the readings simultaneous on a display screen. Alarm warnings are given
through a combination of a loud audible alarm, a bright visual alarm of blue/red
flashing LEDs and an internal vibrator. Tetra can be fitted with a wide range of
modular, plug and play gas sensors. Each sensor carries an intelligent processor
which contains calibration and sensor information.
Tetra is battery operated and is available with rechargeable and non-recharge-
able battery options. The rechargeable unit contains its own internal charger, a
battery charger power supply is available for 110 V or 230 V a.c. see section XI
for more information.
At Crowcon we recognized the need for a reliable and robust confined space
personal monitoring system, which is both lightweight, compact, easy to use
and cost effective. Tetra has a single operator button, and an intelligent user-
friendly display with automatic backlight. Gas levels are continuously monitored
providing normal gas readings, peak readings and time weighted averages
(TWA). Tetra is available as a diffusion sampling instrument or with built in elec-
tric sampling pump. Configuration and data/event logging is handled by
Crowcon Portables PC software, the PC communication link being provided
through a fast, reliable optical link.
Tetra’s shape and design makes it comfortable to wear and as non-intrusive as
possible, with a non-slip grip for better handling. Extra accessories, such as
shoulder strap and chest harness, can be purchased.
Tetra has been designed from top to bottom to bring you a revolution in ease
of use, maintenance and extreme reliability. Through innovative and rigorous
design technology, we have introduced several new features.
i-module gas sensor
Tetra uses unique plug and play i-module sensor technology. Each sensor unit
incorporates its own intelligent processor holding sensor configuration and cal-
ibration data. Different sensors can be purchased, and once inserted, are imme-
diately ready to run. Tetra can operate with up to four sensors and display
simultaneously, information and gas readings, for all the sensors, on one screen.
This means no redundancy and assured future investment in your Tetra unit,
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