DCP LogIT DataMetern1000 Manuel d'instruction - Page 6

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Sensors

DataMeter uses the Microsense® range of sensors and adapters which were

specially developed for LogIT products. There are two main types of sensor;

analogue and digital. Analogue types measure levels but Digital sensors only

have two conditions; on/off or 1/0.

•Sensor design

The main philosophy behind the design concept of sensors follows the same

ideals as DataMeter - robust and easy to use.

One of the main problems with nearly all electrical items in the classroom is wires.

Wires can break, get in the way and are invariably either too short or too long.

Where possible and practical Microsense sensors are completely self contained

in metal shells with no wires attached. This makes them robust, compact and they

can be plugged directly into DataMeter so that logger and sensors can be held

in one hand with no wires to trail around or break.

And if you want to use sensors away from DataMeter, just use an extension cable

or several cables linked together:

Standard 1 metre and 3 metre length robust extension cables with metal

connectors are available (or if you prefer you can make your own). Then if a

cable does get damaged you can still carry on using the sensor and because the

cables are simple and have no electronics inside a technician can repair the

broken wire!

•Adapters for connecting other equipment

As well as self contained sensors there are also Microsense adapters to enable

you to use other equipment which has suitable outputs.

Some third-party sensors and instruments have outputs which have an analogue

voltage range of 0 to 1 volt. A 1 volt sensor adapter is available, as are adapters

for other output levels. Some software also allows you to redefine and recalibrate

the voltage to the sensor's actual value and units. The balance interface adapter

enables most balances with RS232 type data outputs to be plugged into

DataMeter just like a sensor. This enables you to measure mass at the same time

as other parameters - ideal for evaporation, transpiration etc.

•Updating for new sensors

DataMeter is compatible with all Microsense sensors and adapters (except

Breathing sensor & LIVE sound) released as of August 1999.

However if you purchase a new sensor introduced after this date it may show ???

when you plug it in. You will need to upgrade the internal DataMeter system to

recognise the new sensor. This is quick and easy to do using a new system update

available free of charge from our web site (www.dcpmicro.com) or using a

System disc which is available from DCP.

Meter and sensors

Power

Sensor 1

˚C

DataMeter mode

M = Meter

L = Logging

21.3

T = Timing

•METER MODE enables you to plug sensors and adapters in and use DataMeter

as a meter without storing any data. Meter mode is automatically selected when

you first switch DataMeter on and is indicated by a small M at the bottom left of

the screen.

•BATTERY ICON - A small battery icon is shown just above the M and when the

battery is healthy it should be 'full' as the picture above shows. When it is getting

near to exhaustion the icon starts to empty until it flashes, when you have very

little time left. You should charge DataMeter as soon as possible when the level

starts to go down.

•CHARGING ICON- when the mains adapter is plugged into DataMeter the

battery icon changes to a strike symbol as shown below. This indicates the

battery is being charged - you can also use DataMeter at the same time.

See page 9 for more information on correct charging of the battery.

•GENERAL CONTROLS - by progressing through the menus using the blue button

you can change some of the operational functions such as display contrast,

beeper on/off and set the time and date.

Insert sensors

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•SENSORS - most Microsense

sensors are compatible with DataMeter. All self

identify themselves in calibrated SI units and most are compact and robust with

no wires so that they plug directly into DataMeter - they can also be used

remotely using Microsense extension cables.

Temperature

-10 - +110˚C

Sensor 2

Sensor 3

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ProTemp temperature sensor