• Offshore Platforms Gas Pipeline
  • Monitoring Sour Gas Treaters
  • Storage Tanks
  • Monitoring Amine Treaters
  • Ammonia Plants
  • Stack Gas Monitoring
  • Ethylene/Propylene Plants
  • Fuel Gas to Boilers
  • Reformer Recycle Gas

 ASTM D4080, D4084, D4323 compliance
 software SIL2 certified
 Interference-free (selective to H2S only)
 Wide rangeability (50 PPB up to 600 PPM without dilution)
 Fiber optic technology
 Microprocessor electronics (PC 104)
 Multiplexing capability (up to 4 detection modules)
 Multistreaming capability (up to 4)
 Very short response time (typically 20 s at 5 PPM)
 No zero/span drifts
 16 keys keypad TOUCHSENSE™ technology
 PPB sensitivity
 Dedicated failure alarms
 1 analog output (4-20 mA) per detection module

Hydrogen sulfide reacts specifically in presence of lead acetate by forming lead sulfide (Pbs)
Pb (Ac)2 + H2S = Pbs + 2 ACOH
The NOVASULFTM HG 400 Series measures the speed of darkening resulting from the formation of lead sulfide on the tape by means of a fiber optical photodetector. At the beginning of each measurement cycle, the tape advances to a new blank portion (spot) of the tape. As soon as the H2S reacts on the tape, the speed of darkening measurement is done by comparison with the calibration curve stored in the instrument memory. Several measurements are done on the same spot, up to the saturation level.
When saturated, the tape advances for a new measurement cycle. During the tape advances, the last measurement is held in the instrument memory. Using this method no zero or span drifts can occur. Furthermore, measurements can be achieved even on already darkened (polluted) spots as far as it does not reach the saturation point.
By measuring every millisecond and averaging every second, the instrument response time is very fast even at very low concentrations. The H2S concentration is directly digitally displayed in the required units (PPB, PPM…).
Several analog outputs are available including process and instrument failure relay contacts.

MR 301: Rangeability from 0-100 PPB up to 0-600 PPM
Detection Module – Sizes : W 370 x H 450 x D 210mm – Weight : 10 Kg approx.
19’’ Electronic Module – Sizes : W 270 x H 177 x D 340mm – Weight : 5 Kg approx.


– PrincipleColorimetric.
– DetectorSingle photodetector acting as a measure and reference linked to a fiber optic cable. Tape illuminated by a focused LED via the same fiber-optic path.
– ElectronicsPC  104  type. Intel  Celeron  400  MHz microprocessor.  256 Mb  SDRAM  embedded memory.  512  Mb compact Flash for the operating system, the application, the customer parameters, and the calibration curves storage.
– SoftwareC++, Windows TM XPe based.
– Range unitPPB/V, PPM/V, PPB/W, PPM/W, mg/m3, mg/l – depending on the application.
– Rangeability0-50 PPB up to 0-20% depending on the selected model.
– Sensitivity2 % of the concerned range.
– Response timeBetween 20 s and 120 s, depending on the range. Full-scale deviation. (typically 20 s at 5 PPM)
– Linearity± 2 % of calibration full scale. ± 3% below 10% of the scale
– Reproducibility± 2 % of calibration full scale. ± 3% below 10% of scale
– Accuracy± 2 % of calibration full scale. ± 3% below 10% of scale
– Zero/span driftNone due to a single photodetector technique.
– Multiplexing capabilityUp to 4 detection modules.
– Multistreaming
Up to 4. Using up to 4 detection modules (optional) with only one electronic module.
– Process alarm1 per stream. Adjustable level. Potential free relay contacts 3A 230 VAC rated in N.O. or N.C. Relay coil normally energized or de-energized (programmable).
– Instrument failure alarm1  per stream.  Potential free relay contacts  3A  230VAC  rated in  N.O.  or  N.C.  Relay coil normally energized. Dedicated alarms are available on the digital output (RS 485).
– Analog output(s)1 as standard – up to 4 on option. 4-20 mA self-powered, galvanically isolated, 1000 ohms max, loop load.
– Built-in keyboard16 keys, optical TOUCHSENSE™ technology.
– Built-in displayAlphanumeric 4 lines, 20 characters each, backlighted.
–  H2S concentration.
–  Functional parameters
– Power supply85 up to 264 VAC – 47 up to 440 Hz.    120 VDC to 370 VDC.
– Power rating40 VA max.
– Area classificationDetection Module :
CE 0080 II 1 GD
c Ex ia IIC T4
c Ex iaD 20 IP66 T135°C
c Ex is op Ga IIC T4 **
** if optic fiber modules
– Area classificationElectronic Module: Safe area – 19 inches rack
– Ambient temp.– 20 °C to + 40°C
– Sensing tapeLead acetate impregnated cellulosic paper CHEMCOLOR™. 60m roll. (200 feet).
– Tape lifeBetween 14 and 60 days depending on the range and application.
– Storage life5 to 7 years, under the original sealed envelope.
– RFI protectionConform to EN 50270: 2006 (Product type 2)
– Sample flow rate0.15 up to 0.30 l/min at 1.10 bara depending on the range and application. Flow alarm switches optional.
– Sample temperature0°C up to + 40°C (gas phase).
– Sample humidifier5 % acetic acid in distilled water, to optimize the chemical reaction on the tape. Consumption 5 to 10 ml per week depending on the sample nature. Low-level alarm optional.
– Analyser ventTo atmosphere.  NO BACK PRESSURE OR VACUUM ALLOWED, which would affect the measure. Vent compensation system optional.
– Dilution systemsAbove 600 PPM for HG 302 and HG 303.
– Dilution gasNitrogen, 0.5 up to 5 L/min at 1.10 bara depending on the application.
– Ambient working temp.0°C up to + 40°C  –      2°C stability for optimum performances.
– Storage temperatureAnalyser :  -15°C up to + 60°C 
Sensing tape : -10°C up to + 60°C
Humidifying solution: 0°C up to + 40°C.
– Relative humidity90 % max. non condensing.
– Material316L Stainless steel, all material compatible with H2S.
– Connections1/8 ” OD, 1/4” NPT Female

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