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１．OUTLINE
An electric charge is generated when solid particles in the gas passes through the probe of
the dust monitor on the duct or pipe.
This electric charge is known as frictional static electricity or contact electrification.
The size of the electric charge can be calculated by the following equation and be regarded
as the value of the electrical current and is in proportion to the amount of dust.
Ｋ ・ Ｍ ・ Ｖ
ｂ
Ｉ＝ ─────────────
ｄ
Ｉ ＝ Current signal
Ｖ ＝ Flow velocity
Ｋ ＝ Constant depending on a particle
ｂ ＝ Coefficient
Ｍ ＝ Particle mass
ｄ ＝ Diameter of a particle
After the signal for the current is filtered and amplified, an instrumentation signal and
a contact signal between 4mA to 20mA in proportion to the amount of dust are sent.
２．SPECIFICATION
2-1．Power supply
2-1-1．Voltage AC 80V～240V 50/60Hz
2-1-2．Power consumption 4VA
2-2．Measurement material Solid particle in gas
2-3．Particle type of the material All solid particles
2-4．Dust size ≧ 0.3 μm
2-5．Dust concentration 0.1mg/m
３
～ 1000mg/m
3
2-6．Measurement principle Tribo-electric charge detection method
2-7．Measurement conditions (process conditions)
2-7-1．Temperature ≦ 250℃
2-7-2．Pressure ≦ 200kPa
2-7-3．Velocity ≧ 4m/s
2-7-4．Humidity ≦ 40vol％
2-8．Ambient conditions
2-8-1．Temperature(※1) -20 ～ 65℃（Non condensing）
2-8-2．Humidity ≦ 95％RH（Condition: State of case sealing up）
2-9．Output signal
2-10-1. Analog signal DC 4 ～ 20mA×1（max. 23.3mA）
Load: Max500Ω（Isolated）
2-10-2．Relay output signal Alarm contact: 1b×1（AC250V,2A／DC30V,2A）
Upper limit contact: 1a× 1（AC250V,2A／DC30V,2A）
2-10．Mounting R1 Screw(1”
Socket)
A flange is also possible as an option.
2-11．Measuring range 9 ranges switchable
2-12．Protection IP65(With the cover and cable grand tightened)
Attention : When only one side of the cable gland is used, replace the unused side of the cable
gland and plug in order to maintain the protective structure.
!
※1:The maximum temperature is different according
to the range.
Range