Ship gas detection application

Gas detection for marine

The detection of hazardous gases has always been a complex subject, making the selection of the appropriate sensor, instrument, or equipment a difficult task. Sigma offers infrared sensor technology and catalytic sensors for flammable gases.

The sigmaguard flammable series gas detectors are employed to detect, in an atmosphere mainly composed of air, either the presence of flammable compounds, in terms of percentage of the Lower Explosion Level (% LEL) .

The professional Catalytic sensor (Pellistor) employed for the flammable Gas detection, shows an excellent output linearity up to 100 % LEL as well as a superior repeatability and durability sigmaguard’s local and remote alarm capability, as well as, that the unit can function as stand alone or as part of a central control system, makes it ideal for these applications as it is easy to use and requires very little maintenance.

Common Specifications

Sensing element ………….. Pellistor.
Measurement range ………….. 0-100% LEL or different in ppm.
Resolution ………….. 0,1 mA; Display +/-1%, +/- 1 digit.
Power supply ………….. 12- 24 Vdc -20% + 15%.
Consumption at 12Vdc 90 mA medium) ………….. 130 mA (max).
Control unit ………….. Microprocessor 10 bit.
Led visual indications ………….. 3 red for Alarm levels, yellow for Fault and green for power supply present.
Display characteristics ………….. 4 digit, 7,5 mm high, 7 segment LED display.
Proportional output ………….. 4-20 mA su 200 ohm; 4-20 mA on 200 ohm.
Serial Output ………….. Serial RS-485 for multiple controller IDI” (optional).
O/C outputs ………….. Open collectors optional board.
Auto zero routine ………….. Zero drift compensation.
Digital filter ………….. variable average on the values sampled.
Resolution ………….. (microprocessor) 1024 / points.
Precision ………….. 5% of range or 10% of readout.
Repeatability ………….. +/- 5% del F.S.
Warm-up time ………….. max 5 minutes.
Stabilization time ………….. < 1 minute.
Relative humidity ………….. 20-90 % Rh / 40° C.
Operative pressure ………….. 80-110 KPa.
Air velocity ………….. < 6 mS.
Weight ………….. 700 gr.
Dimensions ………….. L105 x H200 x D110 mm.
Enclosure ………….. Explosion proof.
Orientation ………….. The detector must be mounted sensor head downward.

Detector Versions & Detectable Gases

Methane, Petrol Vapours, LPG, Natural Gas, Propane, Butane, Pentane, Hydrogen, Ethyl Alcohol, Methyl Alcohol, Propyl Alcohol, Ammonia, Toluene, Cilene, Acetone, Ethyl Acetate, Xesane, Ethane, Methyl Ethyl Ketone, Ethylene, Cyclopentane, Propane, Acetylene.

Detector Versions And Detectable Gases

Model SG100

Model SG100 Flammable gas detector

Model SG100 is a hand held Gas Leak Digital Detector with a goose neck flexible probe which is equipped at the tip with a semiconductor gas sensor to detect gas leaks in fuel systems, piping, and appliances.The device responds to CH4 (Methane), LPG (mixture of isobutane and isopropane) and to other combustible gases (hydrocarbons). The measured concentration appears on the large backlit display in a choise of measuring units (ppm, % VOL , % LEL). It is supplied with a case.

Technical Data

Fuel gas Leaks :	Methane, LPG, propane, butane…
Measuring range :	0 to 10,000 ppm (methane), 0-1 % VOL, 0-20 % LEL
Resolution :	1ppm
Units :	ppm,% VOL,% LEL
Probe :	30cm flexible probe
Display :	Large digital backlit
Alarm :	Beeper adjustable
Sensor :	Semiconductor
Functions :	Min/Max, ”Hold”, Auto shutoff
ATEX :	No
Battery :	9V alcaline
Dimensions :	147,7 x 34,9 x 50mm
Net Weight :	200 g
Warranty :	3 YEARS

Type PG – portable single or multiple gas detector

The instrument is intended to be used for the protection of personnel entering or working within an environment where a gas hazard may or is known to exist. PG is an intrinsically safe portable multi-gas instrument for use in category EEx iad potentially explosive atmospheres.It can be fitted with up to 4 sensors in various combinations of flammable, oxygen and toxic gases to provide simultaneous monitoring of each gas.

Features

wide range of gas detection capabilities.
up to four sensors per analyzer.
flammable gas selection from built -in menu.
programmable alarm levels for each sensor.
internal data-logging facility standard.
data Logging in 3 modes.
certified intrinsically safe.
display backlighting.
built-in audible & visible alarms.
Accessories to provide aspiration.
COSHH monitoring (STEL and LTEL).
Flammable gas selection from built -in menu.
Peak readings facility for pre – entry testing.
Power and Fault indicators.
Low battery alarm.
rechargeable or dry battery packs available.
internal intrisically safe pump (optional).
belt clip & hook.
PC interface – facilitates downloading, viewing or printing (data logged), instrument configuration, calibration (report printing) & programming.

Partial List of Gasses detected O2, H2, CO2, HCI, CO, NOx, H2S, CI2, SO2, O3 VOCs, Toxic, Flammables (LEL).

Sensors used :	Pellistor, Electrochemical, Non Dispersive Infrared (NDIR)
Weight :	1kg (2,2lbs)
Dimensions:	(108 mm x 185 mm x 50mm) (4.25”W x 7.3” H x 1.97” D)
Display :	2×16 Character Backlit LCD
Operating Times :	Rechargeable (12 hrs.) Dry Cell (24 hrs.)
Alarm Outputs :	Red flashing visual alarm, audible horn
Alarm Levels :	Flammables – 1 Level (high) Oxygen – 2 Levels (low, high) Toxics – 3 Levels (high, STEL, LTEL)

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