Features
- Unique measuring principle,”Opt-Sonic calculation” is applied
- This can minimise the interference effects caused by interference gases, and a high-accuracy measuring result can be obtained
- Fast response time T90 reaction within 5 seconds
- High repeatability +/- 0.02MJ/m3
- Wide operation temperature -20 ~ +57 degree C
- Explosion-Proof structure even for Hydrogen Exd IIB
- High ingress protection level IP66 / IP67
- Remarkable temperature characteristic
- Below 0.10MJ/m3 fluctuation for the temperature change in a day (< 20 degree C)
- Easy to switch the display among “Calorific value”, “Density” and “WOBBE index” just by the button operation
Applications
- Electric Power Energy
- Gas Energy
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Gas Engine for Ship
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Biogas
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Iron Steel
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Refinery
Explosion-proof Calorimeter OHC-800 Overview
The OHC-800 is an all-in-one explosion-proof calorimeter which features high accuracy, continuous measurement and high-speed response.
“Opt-Sonic calculation” is performed using the optical and sonic sensors. “Opt-Sonic calculation” is based on combining 2 measurement results obtained by the 2 sensors. This can minimise the effects of interference gases on the reading and enable high-accuracy, 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”
The displayed unit is easily switched by pressing the button. Laborious calculation is not needed. - Fulfilling self-diagnosis function and running cost. The self-diagnosis function, including fault diagnostics, prevents the calorimeter from becoming unable to measure the gas. Few consumables are needed, and this saves on running costs.
- Designed to be installed in a wide variety of locations.
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.
Explosion-proof Calorimeter OHC-800 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-energise (Energise when alarming) or Energise (De-energise 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-energise (Energise when alarming) or Energise (De-energise 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>) |
*1 Total concentration of interference gases such as N2, O2, CO2, CO etc. contained in a target gas is estimated as less than 20%
*2 Contact Control Equipment Pty Ltd for the other measuring ranges
*3 Contact setting is adjustable
- Overview
-
Explosion-proof Calorimeter OHC-800 Overview
The OHC-800 is an all-in-one explosion-proof calorimeter which features high accuracy, continuous measurement and high-speed response.
“Opt-Sonic calculation” is performed using the optical and sonic sensors. “Opt-Sonic calculation” is based on combining 2 measurement results obtained by the 2 sensors. This can minimise the effects of interference gases on the reading and enable high-accuracy, 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”
The displayed unit is easily switched by pressing the button. Laborious calculation is not needed. - Fulfilling self-diagnosis function and running cost. The self-diagnosis function, including fault diagnostics, prevents the calorimeter from becoming unable to measure the gas. Few consumables are needed, and this saves on running costs.
- Designed to be installed in a wide variety of locations.
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.
- Easy to switch the display among “Calorific value”, “Density” and “WOBBE index”
- Specifications
-
Explosion-proof Calorimeter OHC-800 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-energise (Energise when alarming) or Energise (De-energise 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-energise (Energise when alarming) or Energise (De-energise 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>) *1 Total concentration of interference gases such as N2, O2, CO2, CO etc. contained in a target gas is estimated as less than 20%
*2 Contact Control Equipment Pty Ltd for the other measuring ranges
*3 Contact setting is adjustable
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