Delta OHM DO2003, Руководство пользователя, Страница: 12 / 60

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THE PROBES
The datalogger probes are equipped with an "intelligent" module (SICRAM) that works as an
interface between the sensor in the probe and the DO2003 unit. Inside the module there is a
microprocessor circuit with a permanent memory which allows the datalogger to recognise the type
of connected probe: temperature, humidity, pressure, air speed, … the probe calibration data are
stored in the memory. In this way the probes are interchangeable and they can be used on any
DO2003 indifferently.
P
ROBE
C
ONNECTION
The recognition of the probes takes place upon the instrument power on, and not when the
instrument is already on, thus if a probe is connected when the instrument is already
operating, it has to be switched off and on again.
The two DO2003 inputs are identified by an “A” (left input) and by a “B” (right input). Air speed,
flow, pressure and temperature probes have to be connected (and are thus recognised) to input A.
On the contrary, RH/temperature probes and Pt100 temperature probes have to be connected (and
are thus recognised) to input B.
For more details concerning the probes, see the paragraphs related to the single measurements.
H
OW TO
M
EASURE
1. U
SE THE
ON/OFF K
EY TO
S
WITCH
O
N AND
O
FF THE
I
NSTRUMENT
•
To turn on the instrument, press and release the ON/OFF key.
•
This operation activates the self shut-off timer: after approximately 8 minutes the keyboard is
inactive, the instrument will shut-off. If you want to disable the self shut-off function, hold down
the HOLD key throughout the whole switching-on routine, the battery symbol will flash once a
second to show that the self shut-off function has been disabled.
•
Upon power on, all the display digits and symbols, as well as all the keyboard LEDs will be lit
up: in this way you can check if they work properly. The change to standard operation is
automatic.
2. D
ISPLAY
C
ONTROL
•
After all segments have lit up, the instrument is ready to measure and uses the unit set before the
instrument had been switched off.
•
If a probe is either broken, not properly connected, or if it is measuring a value beyond the
provided range, the
Err indication will be displayed: check the sensor and/or the connector.
•
If no probe is connected to the inputs, a dotted line ( - - - ) will be displayed.
3. S
ELECTING THE
U
NIT OF
M
EASUREMENT
•
Press the Unit A key repeatedly to select the unit of measurement related to input A (visible on
the display top side); press Unit B to select the unit of measurement related to input B (visible at
the bottom of the display).