51 series

Explosion-proof Gas Analyzer

HORIBA’s 51 Series of explosion-proof analyzers provide safe, reliable and accurate measurements when analyzing flammable gases or operating in explosive environments. The 51 Series complies with Japanese explosion-proof certification (JPEx). The 51 Series explosion-proof analyzers infrared allow for the measurement of CO, CO₂, CH₄ and other organic gases. The TCA-51 uses a thermal conductivity detector for H₂ measurements and the MPA-51 and PMA-51 models integrate magneto-pneumatic and paramagnetic detectors for O₂ measurements.

Segment: Process And Environmental

Division: Process Gas

Manufacturing Company: HORIBA, Ltd.

Explosion-proof Models for Flammable and Explosive Classified Areas
The 51 Series is approved for use explosive and flammable atmospheres in Japan, which complies with Japanese explosion-proof certification (JPEx).
Self diagnosis function
To provide stable gas analyses, a self-diagnosis function is activated when an abnormal condition is detected. A management function when enacted shows the records of calibration factors and controls auto calibration.
Reliable analysis
A correction or compensating detector mitigates interferences of gases that interfere with the gas being measured
LED Display
The highly visible 51 Series LED display allows operators to easily view the analyzer’s status

Model			EIA-51d	EIA-51p	TIA-51d	TIA-51p
Type of protection			Exd Ⅱ B+H₂T4	Expx Ⅱ T4X	Exd Ⅱ B+H₂T4	Expx Ⅱ T4X
Frameproof enclosures			●		●
Pressurized apparatus				●		●
Measuring principle			Non-Dispersive Infrared Absorption Method (NDIR)
Component			CO, CO₂, CH₄, etc.^*1
Measurement range	Minimum range		0 to 0.11 vol% (Depends on the component)		0 to 50 ppm (Depends on the component)
	Maximam range		0 to 100 vol% (Depends on the component)		0 to 2000 ppm (Depends on the component)
	Optional		100-90 to 50 vol% (Depends on the component)		0-20 to within less than 50 ppm (Depends on the component)	—
Range Ratio			—		—
Performance	Repeatability	Standard range	Zero : ±0.5% of full scale		Zero : ±0.5% of full scale
		Standard range	Span : ±0.5% of full scale		Span : ±0.5% of full scale
		Optional range	Zero : ±0.5% of full scale		Zero : ±1.0% of full scale
		Optional range	Span : ±0.5% of full scale		Span : ±1.0% of full scale
	Linearity		±1.0% of full scale
	Drift^*2	Standard range	Zero : ±2.0% of full scale/week
		Standard range	Span : ±2.0% of full scale/week
		Optional range	Varies by specification
		Optional range	Varies by specification
	Response time (from inlet of analyzer)		—		T₉₀ within 20 seconds T₉₀ within 40 seconds (TIA optional range)
Sample gas Condition	Gas composition	Flameproof enclosures	O₂ : 21% or less, no mist, no dust The hazardous must be equivalent or less with electrical apparatus group Ⅱ B, gas and vapor-air mixture corresponding to temperature code T4, and Hydrogen-air mixture.
	Gas composition	Pressurized apparatus	O₂ : 21% or less, no mist, no dust The ignition temperature must be equivalent or less with electrical apparatus of gas and vapor-air mixture corresponding to temperature code T4.
	Pressure		Over 1.98 kPa
	Flow rate		Approx. 500 mL/min.
	Temperature		Ambient temperature
	Exhaust		Atmosphere pressure
Materials in contract with sample gas			SUS304, SUS316, FKM, CaF₂, Au, etc.
Calibration method			Standard : Manual correction, Option : Automatic correction
Analog output	Output content / Output specifications		1 concentration output channel / DC 4 to 20 mA (DC 0 to 16 mA / 0 to 20 mA, DC 0 to 1 V / 0 to 5 V / 1 to 5 V / 0 to 10 V optional)
Analog output	Alarm setting		Arbitrary setting is available with span range from -10% to +110% of output for current and voltage. Negative output values set to zero.
Contact Input-output (option)			6 channels
Digital connection (option)	Interface		RS-485
	Protocol		Modbus-RTU
	Communication speed		Selected from 19200 bps / 9600 bps / 4800 bps / 2400 bps / 1200 bps
Environment conditions	Location		Indoors
	Operational Temperature		-5 to 40 °C (away from direct sunlight and radiant heat)
	Humidity		90% or less
	Vibration		Avoid large vibration sources (less than 100 Hz; 0.3 m/s²)
Utility	Protective gas for Pressurized apparatus composition		Gas composition : N₂, Gas pressure : 196 to 690 kPa, Gas flow rate : 10 L/min. (when purging), 500 mL/min. (when operating) Dew Point : -30°C Saturated or less

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*1 Please consult HORIBA for measurement of the other components. *2 Guaranteed at normal ambient temp. ±5°C

■Recommended Measuring Ranges

	EIA-51d/51p		TIA-51d/51p
	Min. Range	Max. Range	Min. Range	Max. Range
CO	0 to 0.21%	0 to 100%	0 to 50 ppm	0 to 2000 ppm
CO₂	0 to 0.11%	0 to 100%	0 to 50 ppm	0 to 1000 ppm
CH₄	0 to 0.21%	0 to 100%	0 to 50 ppm	0 to 2000 ppm
C₃O₈	0 to 0.051%	0 to 100%	0 to 50 ppm	0 to 500 ppm
NO	0 to 0.21%	0 to 100%	0 to 100 ppm	0 to 2000 ppm
SO₂	0 to 0.051%	0 to 100%	0 to 100 ppm	0 to 500 ppm

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Please consult HORIBA for applications other than those listed above.

Model			TCA-51d	TCA-51p	MPA-51d	MPA-51p	PMA-51d
Type of protection			Exd Ⅱ B+H₂T4	Expxd Ⅱ T4X	Exd Ⅱ B+H₂T4	Expx Ⅱ T4X	Exd Ⅱ B+H₂T4
Frameproof enclosures			●		●		●
Pressurized apparatus				●		●
Measuring principle			Thermal Conductivity Detector Method (TCD)		Paramagnetic (magneto-pneumatic type)		Paramagnetic (dumb-bell type)
Component			H₂		O₂
Measurement range	Minimum range		0 to 10 vol%		0 to 5 vol%
	Maximam range		0 to 100 vol%		0 to 25 vol%
	Optional		0-1 to within less than 10 vol% 100-90 to 50 vol%		0-1 to within less than 5 vol%		—
Range Ratio			—		Max.1:25 Max.4 range		Max.1: 5
Performance	Repeatability	Standard range	Zero : ±1.0% of full scale		Zero : ±0.5% of full scale		Zero : ±0.1 vol% O₂
		Standard range	Span : ±1.0% of full scale		Span : ±0.5% of full scale		Span : ±0.1 vol% O₂
		Optional range	Zero : ±1.0% of full scale		Zero : ±1.0% of full scale		—
		Optional range	Span : ±1.0% of full scale		Span : ±1.0% of full scale		—
	Linearity		±1.0% of full scale
	*Drift^2**	Standard range	Zero : ±2.0% of full scale/week		Zero : ±1.0% of full scale/week		Zero : ±0.05% vol% O₂/week
		Standard range	Span : ±2.0% of full scale/week		Span : ±2.0% of full scale/week		Span : ±0.05% vol% O₂/week
		Optional range	Varies by specification		Zero : ±1.0% of full scale/week		Varies by specification
		Optional range	Varies by specification		Span : ±3.0% of full scale/week		Varies by specification
	Response time (from inlet of analyzer)		T₉₀ within 20 seconds
Sample gas Condition	Gas composition	Flameproof enclosures	O₂ : 21% or less, no mist, no dust The hazardous must be equivalent or less with electrical apparatus group Ⅱ B, gas and vapor-air mixture corresponding to temperature code T4, and Hydrogen-air mixture.
	Gas composition	Pressurized apparatus	O₂: 21% or less, no mist, no dust The hazardous must be equivalent or less with electrical apparatus of group Ⅱ C gas and vapor-air mixture corresponding to temperature code T4.		O₂: 21% or less, no mist, no dust The ignition temperature must be quivalent or less with electrical apparatus of gas and vapor-air mixture corresponding to temperature code T4.
	Pressure		Over 1.98 kPa		14.7 to 24.5 kPa		Over 1.98 kPa
	Flow rate		Approx. 500 mL/min.		Approx. 1.5 L/min		Approx. 300 mL/min
	Temperature		Ambient temperature
	Exhaust		Atmosphere pressure
Materials in contract with sample gas			SUS304, SUS316, FKM, glass, SiO₂, AU		SUS304, SUS316, FKM		SUS304, SUS316, Pt, glass, FKM
Calibration method			Standard : Manual correction, Option : Automatic correction
Analog output	Output content / Output specifications		1 concentration output channel / DC 4 to 20 mA (DC 0 to 16 mA / 0 to 20 mA, DC 0 to 1 V / 0 to 5 V / 1 to 5 V / 0 to 10 V optional)
Analog output	Alarm setting		Arbitrary setting is available with span range from -10% to +110% of output for current and voltage. Negative output values set to zero.
Contact Input-output (option)			6 channels
Digital connection (option)	Interface		RS-485
	Protocol		Modbus-RTU
	Communication speed		Selected from 19200 bps / 9600 bps / 4800 bps / 2400 bps / 1200 bps
Environment conditions	Location		Indoors
	Operational Temperature		-5 to 40°C (away from direct sunlight and radiant heat)
	Humidity		90% or less
	Vibration		Avoid large vibration sources (less than 100 Hz; 0.3 m/s²)
Utility	Protective gas for Pressurized apparatus composition		Gas composition : N₂, Gas pressure : 196 to 690 kPa, Gas flow rate : 10 L/min. (when purging), 500 mL/min. (when operating) Dew Point : -30°C Saturated or less