DIFF automatic volume flow meter
User manual
V11.2 - EN
Page
4
TDC 16-7-2012
OBSERVATOR
instruments
1. Introduction
The DIFF is a tool developed by Observator for
measuring air flow and air temperature. The DIFF
is commonly used by installers and controllers in
the housing and utility industry. The DIFF can
perform a pressure compensated measurement as
specified in the building regulations in the NEN
1087, NEN 8087. The flow meter is also
recommended at the ISSO publications -61, -62, -
63 and -8010 and BRL 6000-10. Operating errors
are prevented by an automated measurement
process. The flow reading is digital and clear, this
prevents reading errors. The DIFF is prepared for data storage with SD card and the use of
DIFFiner. Please contact your dealer or Observator for this option.
The standard package contains:
DIFF automatic volume flow meter with pressure compensation
Battery
charger
4 x 1,5V AA NIMH batteries
Manual
Calibration
report
transport
case
Optionals:
-
Upgrade for data storage including PC software (DIFFiner) and 2GB SD card,
- Various
attachments
- Fast
charger.
Specifications
Description Value
Dimensions (250x250)x510xØ200mm
Net weight
2.9 kg with batteries without transport case.
Operating temperature
-10 tot +50 ºC, 0-95% RV
Not condensation
Range
10-400 m3/h, -15 tot +70 ºC
Accuracy
±3% of the reading ±1 m3/h, ±0,5ºC.
Resolution display
0,1<100>1 m3/h, 0,1 ºC.
Resolution Zero
pressure measurer
< 0,2 Pa
Power supply
4x 1,2 V AA NiMH 2700 mAh, rechargeable.
Measuring time (nom.)
< 30 sec
Material casing
ABS
Measuring method
In accordance with NEN1087/1088/8088
EMC In
accordance with EN60132-1, IEC61000-5-
5 etc
IP20 accordance IEC-60529
Battery life
8 hour while measuring 75m
3
/h
