Products Catalog

Specification

The DO 9721 quantum photo-radiometer and thermometer data logger has been
designed for measuring illuminance, irradiance, luminance and temperature.
The instrument has two inputs, A and B, and automatically recognises the probes
connected, whether they be illuminance, irradiance, luminance or temperature
probes, and can display the difference between the two inputs.
As the probes are interchangeable, it is possible to choose the most suitable
combination for all applications without having to recalibrate the instrument. The DO 9721 is able to take illuminance measurements in lux and in fcd (foot-
candle), irradiance measurements in W/m2, in ¼W/cm2 e in ¼mol/m2s, luminance
measurements in cd/m2 and temperature measurements in °C or °F.
The instrument’s Data Logger function enables it to store up to 30,000 readings. The sampling period is variable from 1 second to 12 hours.
The data acquired may later be transferred to a Personal Computer or a printer by
means of the opto-insulated serial line RS232C. For each value stored the date
and time of acquisition are indicated; each acquisition block is ended with a report
which provides the maximum, minimum and mean values.
With the Serial Output function it is possible to obtain the instantaneous values
measured by the instrument at the output of the serial line RS232C, in order to
send them to a printer or a computer.
Other functions such as Hold (which blocks the display), Rel (for taking relative
measurements), Record (for storing the maximum, minimum and mean values)
and Q (integration in time of the measurements with alarm threshold) further
enrich the instrument’s performance.
Thanks to its versatility and to its storage capacity, the instrument is suitable for a
wide variety of applications, both in the fi eld and in the laboratory.
PROBE CONNECTION
The instrument DO 9721 has two circular DIN 45326 8-pole connectors (A and
B) which allow the connection of Delta Ohm probes for measuring temperature,
type TP 870, and probes for measuring the photometric and radiometric intensity,
type LP 9021.
The probe model must be chosen to suit the specifi c application; see the section
on accessories.

INSTRUMENT TECHNICAL DATA
Inputs / type of measurement 2: photometric / radiometric or temperature
Connector DIN 45326 8-pole
Measuring range
Photometric measurements 0...200.000 lux
0...20.000 fcd
0...2.000.000 cd/m2
Radiometric measurements 0...2000 W/m2
0...200.000 ¼W/cm2
0...200.000 ¼mol/m2s
Q energy depends on the active measurements unit
Integration time 19 hours, 59 minutes, 59 seconds
No. conversions per second 2
Working temperature -5...+50°C
Working relative humidity 0...90% R.H. (no condensation)
Serial output RS232C 300...19200 baud (galvanically insulated)
Display Double LCD 12.5 mm
Functions Auto power off / Autorange / Hold / Record /
Maximum / Minimum / Mean / Relative / A-B /
Energy
Memory 512kB (FLASH) corr. to 30,000 measurements
Power supply 9Vdc alkaline battery
Autonomy Approx. 30 hours (continuous duty)
Weight / dimensions 320 gr. / 215x73x38 mm