Name: OHC-800 Explosion-Proof Gas Calorimeter
Brand: RKI Instruments

Overview

All in one explosion-proof gas calorimeter which features high accuracy, continuous measurement and high-speed response.

Opt-Sonic calculation” is applied by using Optical sensor and Sonic sensor
“Opt-Sonic calculation” is based on the calculation combining 2 measuring results obtained by the 2 sensors. This can minimize the interference effects on the reading caused by interference gases, and enable the high-accuracy and reliable measurement. * Opt-Sonic is a term coined by RIKEN KEIKI to describe Optical and Sonic sensors

Easy to switch the display among “Calorific value”, “Density” and “WOBBE index”
Displayed unit is easily switched by pressing the button. Laborious calculation is not needed.

Fulfilling self-diagnosis function and running cost
Self-diagnosis function including fault diagnostic prevents the calorimeter from being incapable of measuring the gas. Few consumables are needed and this saves running cost.

Body structure that can be installed into all types of location
Structure is robust with Explosion-Proof (Exd IIB+H2 T4) and high ingress protection level (IP66/IP67) Both 100VAC~240VAC and 24VDC power supply can be supplied.

Gases

Natural gas
Steel gases (COG,BFG,LDG)
LPG
Natural gas with Hydrogen
Flare gas
Methane
Natural gas with LPG
Boil-off gas
E-methane
Renewable natural gas
Off-gas from refinery
Butane
Biogas
Methanation gas
Low calorie gases, and so on
Biogas with LPG
Hydrogen

Specifications

Model	OHC-800
Measuring principle	Opt-Sonic calculation through measurement of refractive index and sound speed
Measuring gas	CH4 basis Paraffinic Hydrocarbon gases as represented by Natural Gas *1
Measuring targets	Calorific value (Density / WOBBE index selectable)
Measuring range *2	Calorific value : 25.00～50.00 MJ/㎥ (Gross, 0 degree C, 101.325kPa converted) Density : 0.500～1.500 MJ/㎥ (Specific gravity converted)
Measuring method	Constant-flow-rate gas introduction using external sampling devices
Display	Full-dot LCD (with backlight), 3 color LED lamp
External Output	4-20 mA DC (isolated, source current type) maximum load resistance of 300 Ω / RS-485 communication
FAILURE alarm	Low flow, Sensor unit abnormality, Low light amount
FAILURE alarm display	Lamp (red) / Content indication on LCD
FAILURE alarm contact *3	No-voltage contact 1a or 1b De-energize (Energize when alarming) or Energize (De-energize when alarming) Contact capacity of 2 A, 30 VDC (resistance load)
Self-diagnostic function	FUNCTION CHECK (warm-up or maintenance mode), MAINTENANCE REQUIRED, OUT OF SPECIFICATION
Self-diagnostic display	FUNCTION CHECK, OUT OF SPECIFICATION : Lamp (orange) / Content indication on LCD MAINTENANCE REQUIRED : Lamp (green) / Content indication on LCD
Self-diagnostic contact	FUNCTION CHECK, OUT OF SPECIFICATION : No-voltage contact 1a or 1b De-energize (Energize when alarming) or Energize (De-energize when alarming) Contact capacity of 2 A, 30 VDC (resistance load) MAINTENANCE REQUIRED : SSR contact, contact capacity of 20 W, 240 VAC (resistance load)
Power supply	100 – 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)
Ingress Protection level	Equivalent to IP66 and IP67
Operation temperature	-20～+57 degree C（TIIS）/-20～+60 degree C（ATEX/IECEx）
Operation humidity	95%RH or less (no condensing)
Outer dimensions / Weight	Approx. 286 (W) x 453 (H) x 150 (D) mm / Approx. 23 kg
Explosion-Proof structure	Flame-proof enclosures (Explosion-proof class: ExdⅡB+H2 T4 <TIIS>/Ⅱ2GExdⅡB+H2T4 <ATEX/IECEx>)

OHC-800 Explosion-Proof Gas Calorimeter

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