ACCURRA-Hz measures trace oxygen, CO and CO2, and percent or purity of CO, CO2 and hydrogen in an enclosure certified for Gas Group IIC, Zone 1 and 2, T6 (IS/IEC 60079-1:2014). Calibration is possible without opening the covers. Ask for current certificate copies.
Why ACCURRA-Hz
Calibrate with the covers closed
Calibration is done without opening the flameproof enclosure, and is tamper-proof, with separate passwords for user and manager.
Operate from outside the area
Optional ACCURRA-CONNECT software runs every function over Modbus from a PC, where movement in the hazardous area is restricted.
The ACCURRA platform, certified
Dual-range 4–20 mA, failsafe relays, Modbus RTU and calibration history, in a wall-mounted IP 66 enclosure.
Specifications
| Item | Specification | Notes |
|---|---|---|
| Oxygen | 0 to 100 or 1000 ppm; 0 to 25 %; 0 to 100 % or 95 to 100 % | Models 3015, 3030, 3090, 3130 and 3190; electrochemical or paramagnetic |
| Carbon monoxide | 0 to 2000 ppm (electrochemical, 2015); 0 to 100 % (NDIR, 2030) | |
| Methane | 0 to 100 % (NDIR, 4030) | |
| Hydrogen | 0 to 100 % in nitrogen (thermal conductivity, 1030) | T90 below 10 s at 0.6 LPM; other backgrounds on request |
| Oxygen purity | Ambient pressure and temperature compensated | Error below 0.5 % on 3090 and 3190 |
| Enclosure | Wall mounted, 410 H x 370 W x 245 D mm, IP 66, about 12 kg | Gas Group IIC, Zone 1 and 2, T6 as per IS/IEC 60079-1:2014; confirm current certificate validity |
| Power | 24 V DC, 30 W, or 100 to 240 V AC, 50/60 Hz, 45 W | |
| Outputs | Isolated 4-20 mA, dual range, max load 500 ohm; 4 failsafe SPST relays | Two alarms, fault, sample pump or range ID; Modbus RTU over RS 485 |
| Calibration | Without opening the covers; tamper-proof | |
| Sibling | INFINITY-Tx two-wire transmitter | Percent O2, trace CO |
From the current Sarvesh product datasheets and company profile. Specifications may change without notice as products improve. The final responsibility to check that a product meets the process and analyser requirement remains with the customer.
Key features
- Enclosure certified for Gas Group IIC, Zone 1 and 2, T6
- Calibration possible without opening covers, and tamper-proof
- Separate passwords for user and manager; separate hardware diagnostics menu
- Purity oxygen with ambient pressure and temperature compensation
- Optional ACCURRA-CONNECT PC software operates the analyser remotely over Modbus, as if you were standing at it, where movement in the hazardous area is restricted
- Optional auto-calibration with external solenoid valves, started from the keypad, a cyclic timer or Modbus (not on 3015)
- Available panel-mounted with its sampling system
How it works
Hydrogenation, electrolysis, reactors and solvent areas are classified because flammable gas or vapour may be present. An analyser in such an area must not be a source of ignition, so its electronics go in a certified flameproof enclosure.
The usual difficulty with flameproof analysers is calibration, since opening the cover normally needs the area made safe. ACCURRA-Hz allows calibration without opening the covers.
Confirm your area classification, gas group and temperature class when you enquire, and ask us for current certificate copies. We make no SIL claim for these analysers; if your project requires one, tell us at the start.
Requirements and limits
- Certificate validity and scope should be confirmed against your project requirement before ordering.
- No SIL claim is made.
On site: utilities and calibration gases
What to have ready at your plant before installation and commissioning.
| Item | Requirement | Notes |
|---|---|---|
| Power at the analyser | 24 V DC, 30 W, or 230 V AC | |
| Zero gas | Zero-grade nitrogen, 99.9999 % | 10 litre cylinder with regulator |
| Span gas, trace oxygen | 1000 ppm oxygen in nitrogen | 10 litre cylinder with regulator |
| Span gas, 3090 | Zero-grade oxygen; zero on zero-grade nitrogen | |
| Span gas, 3190 | Zero-grade oxygen; zero on 95 % oxygen in nitrogen | |
| Instrument air and service nitrogen | 4 kg/cm² minimum | |
| Mounting | Wall mounted in the classified area | Calibration without opening the covers |
Selection guidance
Choose ACCURRA-Hz for hydrogenation, electrolysis, petrochemical, solvent and gas-house applications. For percent oxygen in a field-mounted two-wire form, see INFINITY-Tx.
Applications
Application pages where this is part of the recommended solution:
- Reactors, hydrogenation and polymerisation
- Electrolyser safety and quality
- Nitrogen blanketing and inerting
- Closed-loop dryers and spray dryers
- Steel plant process gases
Compatible products
INFINITY-Tx
Loop-powered two-wire transmitter for percent O2 and trace CO in hazardous areas.
View INFINITY-TxACCURRA-TCD
Thermal conductivity analyser for binary mixtures of H2, He, Ar, N2 and others, with no reference gas.
View ACCURRA-TCD
ACCURRA-S
Online analyser for trace, percent and purity O2, CO, CO2, CH4 and dew point; can measure two gases from one sample.
View ACCURRA-SHeadline filters
Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection.
View Headline filtersFrequently asked questions
What area classification does ACCURRA-Hz meet?
Gas Group IIC, Zone 1 and 2, T6, as per IS/IEC 60079-1:2014. Ask us for current certificate copies.
Can I calibrate in the field?
Yes, without opening the covers.
Does it have a SIL rating?
We make no SIL claim.
Which gases can it measure?
Oxygen from ppm to purity, carbon monoxide from ppm to percent, methane and hydrogen.
Can I operate it remotely?
Yes, with the optional ACCURRA-CONNECT PC software over Modbus.
Related pages
- ACCURRA-S
- ACCURRA-S oxygen analysers
- ACCURRA-S carbon monoxide analysers
- ACCURRA-S carbon dioxide analysers
- ACCURRA-S methane analyser
- ACCURRA-S M015 moisture analyser
- Hazardous-area oxygen analyser
- INFINITY-Tx
- Hazardous-area hydrogen analyser
- Hazardous-area moisture analyser
- ACCURRA-Zr
- ACCURRA model numbers
- Browse all gas analysers