Explosion-proof Calorimeter



・“Opt-Sonic calculation” is applied by using Optical sensor

 and Sonic sensor.

・Easy to switch the display among "Calorific value", "Density"

 and "WOBBE index".

・Fulfilling self-diagnosis function and running cost.

・Body structure that can be installed into all types of



Sampling method

Suction type

Principle of detection

Opt-Sonic calculation through measurement of refractive index and sound speed

Detection range

Calorific value: 25.00 to 50.00 MJ/m3 (Gross 0℃, 101.325 kPa converted)
Density: 0.500 to 1.500 (specific gravity converted)

Explosion protected construction

Flameproof enclosures

Explosion-proof class

IECEx: Ex db II B+H2 T4 Gb
ATEX: II 2G Ex db II B+H2 T4 Gb

Ingress proof rating

IP 66/67


Japan Ex, ATEX, IECEx, China Ex, FM

Power source

100 to 240 VAC±10 %, 50/60 Hz, max. 18 VA or
24 VDC ±10 %, max. 5 W
(The setting can be changed to either the AC or DC spec.)


Approx. 286(W)× 453(H)× 150(D) mm


Approx. 23 kg

Operating temperature range

-20 to +60 ℃ (no sudden changes)

Operating humidity range

0 to 95 %RH (no condensing)

Target gas

Calorific value of CH4 basis Paraffinic Hydrocarbon gases as represented by Natural Gas, total concentration of interference gases such as N2, O2, CO2, CO etc. contained in a target gas is estimated as less than 20%