Introduction - Observator Instruments Diff-Automatic User Manual

1. Introduction

The DIFF is a unique instrument 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 in
accordance with International Standards. Operating
errors are prevented by an automated measurement
process. The flow reading is digital and clear, this
prevents reading errors. The DIFF is capable of data
storage via SD card and the use of DIFFiner software.
The standard package contains:

DIFF automatic volume flow meter with zero pressure compensation

Battery charger

4 x 1,2V AA NIMH rechargeable batteries

Manual

Calibration report

Transport case

AT-242 Hood 315x315x220 mm, transparent plastic (housing)

Datalogging upgrade incl.:
SD card 2Gb
o
DIFFiner pc-software
o
Options:
- Fabric Hood (Nylon) incl. aluminum frame and fiber rods 400x400mm, 600x600mm,
310x1234mm or 310x1534mm (Utility and squirrel grilles)
- Extra rechargeable battery set
Specifications
Description
Dimensions
Net weight
Operating temperature
Range
Accuracy
Resolution display
Resolution zero
pressure sensor
Power supply
Measuring time (nom.)
Material casing
Measuring method
EMC
Battery life
Version: 12.6 EN
(250x250)x510xØ200 mm
2.9 kg without batteries and transport case
-10 to +50 ºC, 0-95% RV
10-400 m 3 /h, -15 to +70 ºC (5-158°F)
(2,78-111 l/s and 5,89-235CFM)
±3% of the reading ±1 m 3
0,1<100>1 m 3 /h, 0,1 ºC
< 0,2 Pa
4x 1,2 V AA NiMH 2450 mAh, rechargeable.
< 30 sec
ABS
Zero-method. In accordance with
International Standards
In accordance with EN60132-1,
IEC61000-5-5 etc.
IP20 accordance IEC-60529
8 hour while measuring 75 m
Date: 22-09-2020
User Manual Diff
Not condensing
/h, ±0,5ºC
/h
3
AT-DIFF
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