• Up to four gases measured
• Digital interchangeable i-module sensors for full flexibility
• Loud 90dBA audible alarm with selectable tones
• Unique dual color red/blue visual alarm
• Built in vibrating alarm as standard
• Rugged and robust, IP65 ingress protection
• Simultaneous 4 gas display with automatic backlight
• Peak mode operation
• TWA reading recall
• Data & Event logging
• Simple IR interface to PC

Tetra is especially easy to use. A single button provides all the control functions such as switch on, switch off, alarm reset, and access to a small functional menu which provides for peak and TWA (8 hour) This one button operation process has been market tested in Custodian CDL and has been proven to be popular. Tetra gives an audible confidence beep every 10 seconds, and flashes ‘OK’ in normal operation on the screen at the same time. In the event of a change of status from ‘OK’ a warning symbol replaces the OK. The display provides pop up screen warning messages for operational status other than normal.

Tetra is designed to have the most effective alarms on the market place featuring the following:

 A unique blue/red flashing LED visual alarm. Blue flashing LEDS are far brighter than any other color, and we have chosen a blue/red combination, as some standards require a red indicator for gas concentration alarms.

 The alarm sounder has a high output and a range of selectable tones, which allow allocation of preferred or differing tones to the different alarm levels.

 Tetra features a built in vibrating alarm as standard.

Tetra features full simultaneous display, showing gas concentration with gas name and units for each channel in normal operation. In alarm condition the main audible/visual and vibrating alarms are activated and the display shows the highest current alarm level. The alarm LEDs are on the top of the unit to be fully visible at all times. The display gives comprehensive indication of gas concentrations and any relevant alarm or status information, and is fully backlit. Battery status is continuously displayed with a symbol showing up to six bars representing remaining life and providing a low battery alarm.

                 
Crowcon Tetra - 4 gas personal monitor

Tetra has an integral belt mounting clip and can be used with a typical range of optional accessories for wearing and carrying – a universal harness clip allows the use of a shoulder strap or chest harness, and an optional carry case is available.

Tetra can be used for diffusion sampling, for active sampling using a manual aspirator (TET/02), for active sampling using an optional built in electric sampling pump (TET/01). For both pumped sampling and aspirator sampling a simple clip on plate is used with either just a sampling line or an aspirator kit as appropriate. Standard Crowcon sampling accessories such as probes, water traps etc are suitable for use with this product. Pumped units give a clear indication of pump operation on the display as well as indication of flow fail in case of pump stall or blockage.

Tetra is available as either a rechargeable unit utilizing a lithium-ion battery or a non-rechargeable version utilizing 3-AA alkaline batteries. The non-rechargeable version has a slightly taller outer case to accommodate the batteries. The rechargeable version has a built in charger circuit requiring an external power supply. This is a custom supply with some additional built in protection components necessary to ensure the integrity of the safety components within the product. The supplies are available either as a wall socket plug for UK, European and USA type outlets or as an in line supply with flying leads for places where these are not used. Operating life for the rechargeable units on a full charge is more than 12 hours and for alkaline batteries more than 18 hours.

Tetra features Event Logging, i.e. rather than just filling up a data file with minute-by-minute data records, data is written to memory when something significant happens e.g. an alarm threshold is crossed. This means where an instrument needs to be interrogated following an incident the relevant data is quickly and immediately available, and is not obscured by large quantities of meaningless timed data.

Description

Price

Confined Space Kit The kit contains chest harness, shoulder strap, communications software pc interface and carrying (brief) case with foam inserts and Crowmag. ** PC Interface is 9 pin serial** USB adapter available in Tetra parts list.

Flammable

Oxygen

Hydrogen Sulphide

Carbon Monoxide

Sulphur Dioxide

Chlorine

Nitrogen Dioxide

Ammonia

Ozone

Hydrogen N/A N/A

Hydrogen Cyanide

Hydrogen Fluoride

Phosphine

0-25%

0-50ppm

0-500ppm

0-10ppm

0.5ppm

0-10ppm

0-50ppm

0.1 ppm

0-1000ppm

0-25ppm

0-10ppm

0-2ppm

19/23.5%

5ppm

30ppm

2ppm

0.5ppm

3ppm

25ppm

0.1 ppm

N/A

5ppm

1ppm

0.2ppm

19.5/23.5%

10ppm

35ppm

2ppm

0.5ppm

3ppm

25 ppm

0.1 ppm

N/A

5 ppm

1 ppm

0.2 ppm