MSHA-1000 Series

Overview

Designed for R&D and evaluation of fuel cell systems and catalysts - as well as gasoline-exhaust combustion studies - the MSHA-1000 ensures highly accurate measurements in real-time by providing:

  • 2-second T90 response time
  • Virtually no interference from H2O and CH3OH
  • 1% full-scale repeatability and linearity

Unaffected by coexisting gases like CO, the MSHA-1000 eliminates the problem of sensor deterioration inherent in conventional hydrogen analyzers.

Safety features - to reduce the danger of hydrogen leaks - include an internal forced ventilation system, stainless steel sample line, and hydrogen alarm.

Features

  • Fast response time (T90 = 2 seconds) provides real-time measurement of hydrogen concentrations.
  • High selectivity ensures negligible interference from H2O and CH3OH (within ± 2% FS for 40% water vapor in nitrogen base and within ± 2% FS for 10% methanol in nitrogen base.)
  • Unaffected by coexisting gases like CO

Applications

R&D, evaluation, and optimization of:

  • Fuel-cell systems
  • Fuel-cell catalysts
  • Catalyst systems for internal combustion engines

Safety measures

  • Stainless steel sample lines prevent leakage.
  • Leak detector triggers alarm.
  • Brushless fan prevents hydrogen from accumulating inside the main unit if leakage occurs.
  • Pneumatic gas valves are used in place of solenoid valves where contact with hydrogen occurs. 
  • Safe unit configuration: electronic portion separated from gas-handling portion.
  • Effective ventilation system: unit interior constantly purged by ambient air.
  • Alarm system: H2 sensors installed in both sampling and main unit.

Principle

  • Injected sample gas is ionized by electron impact method.
  • The ionized sample passes through a sector-type magnetic field where the charge particle's vector changes due to Lorentz force.
  • A slit allows only hydrogen atoms of Mass No. 2 to pass through.
  • A mass spectrometer detects the total quantity of ions - as an ion current - to determine hydrogen concentration. 

Frow drawing

Manufactured by HORIBA

Specifications

MSHA-1000 Specifications

Main Components

Main unit
CRT, keyboard and mouse
Hydrogen-leak alarm (buzzer and contact output are available)

Measured Component

Hydrogen (H2)

Ranges

0-10 or 0-100% Vol

Output Interval

0.5 s (standard, changeable from 0.2 s to 10 s)

Response Time

T90 within 2.0 s (at flow rate of 5.0 L/min, switching from N2 to 100% vol H2 at sample inlet of main unit)

Noise

Less than 1.0% FS, as standard deviation multiplied by two (for both N2 and 100% vol H2, at output interval of 0.5 s)

Repeatability

Within ± 1.0% FS

Linearity

Within ± 1.0% FS

Drift

Within ± 1.0% FS per hour (for both N2 and 100% vol H2) at specified ambient conditions.

Utilities

N2: 100 ± 10 kPa for zero calibration
H2 in N2 base: 100 ±10 kPa for span calibration
Compressed air: 450 ± 50 kPa for gas valve controlling

Ambient Conditions

20-30oC ± 0.5oC per hour

Dimensions and Weight
(W x H x D)

excluding CRT, keyboard, and mouse

570 x 1190 x 710 mm
22.4 x 46.9 x 28 in

Approx 150 kg / 330 lb

Power

115/120 V AC, 60Hz; or 220/230/240 V AC, 50Hz, (decided at order), single phase.

Max 1.2 KVA

Output

Monitoring on CRT
Saving on hard disk
Analog output (0-10 V)

Related SAE Paper

Click on paper's identification number to order from SAE:

"Application of a Magnetic Sector Type Hydrogen Analyzer for Engine Emission Measurement."

SAE Paper 2001-01-0210

Product Specifications of Sector-type Hydrogen Analyzer MSHA-1000WS

1. About MSHA-1000WS

The MSHA-1000WS is designed for measurement of hydrogen from the gas that exists in the fuel cell systems with reformers. Because the MSHA-1000WS uses the MS as a detector, it is capable of simultaneous measurement in wide range and fast response, and can be applied to continuous measurement of hydrogen concentration in gaseous samples.

Since high-concentration hydrogen flows in sample line of the MSHA-1000WS, special consideration as follows are taken at designing:

  • All the gas lines that hydrogen may flow is made up from stainless steel pipe in order to prevent the hydrogen leakage;
  • No solenoid valves are used in the places that come in contact with hydrogen, e.g. sample line and span gas line. Gas valves that can be driven by compressed air are mounted as substitutes;
  • Air that is surrounding the lines is continuously emitted by fans on the rear panel of the cabinet;
  • A hydrogen-leak alarm is installed inside the cabinet to monitor and to warn when hydrogen leakage occurs.

Exhaust gases from two outlets of this instrument need special care, because high-concentration hydrogen may be included in them. Place or facility to dispose of hydrogen safely should be prepared in advance.

The MSHA-1000WS is not hydrogen-explosion-proof. Issues about safety of the instrument on hydrogen shall be explained by documents before purchasing. 

2. System outline

Model:

MSHA-1000WS

Application:

Gas from fuel cell systems with reformers

Principle:

Sector-type mass spectrometry

Target component and range:

H2: 0-100 vol %

 

Outputs:

  • Color LCD
  • Saving on hard disk
  • Analog output (0-1 V) for each channel

Output interval:

0.5 s (standard, changeable between 0.2 s and 10 s)

3. Configurations

System configuration:

  • Main unit (Analyzer unit and PC are installed.)
  • Color LCD monitor, keyboard and mouse
  • Hydrogen leak alarm (Buzzer and contact output are available.)

Connection of piping:

  • Sample inlet f6/f4 PTFE tube
  • Sample outlet f6/f4 stainless tube (panel lock)
  • Span gas inlet f3/f2 stainless tube
  • Zero gas inlet f6/f4 PTFE tube
  • Vacuum pump exhaust outlet f6/f4 PTFE tube
  • Compressed air inlet f6/f4 nylon tube

Utilities:

  • N2 99.99% 100+/-10 kPa, for zero calibration
  • H2 in N2 base 100+/-10 kPa, for span calibration
  • Compressed air 450+/-50 kPa, for actuation of gas switching valve

Power supply:

115/120 V AC, 60 Hz; or 220/230/240 V AC, 50 Hz, single phase

Power capacity:

Max. 2.5 kVA

Dimensions:

570(W) x 1500(H) x 710(D) mm
(main unit only; excluding CRT, keyboard, mouse and any other projected items)

Mass:

Approx. 200 kg

4. Function and performance

Response (T90):

Within 2.0 s, as T90 for rising
(at flow rate of 5.0 L/min, switching from N2 to 100 vol % H2 at sample inlet of main unit. The response of the sampling unit is not included.)

Noise :

Less than 1.0 % of full scale, as standard deviation multiplied by two
(for both N2 and 100 vol % H2, at output interval of 0.5 s)

Linearity:

Within +/-1.0 % of full scale (at dividing points of 5 for 100 vol% H2)

Repeatability:

Within +/-1.0 % of full scale (switching from N2 to 100 vol % H2, repeated 3 times)

Drift *1:

Within +/-1.0 % of full scale per hour
(for both N2 and 100 vol % H2, ambient temperature 25 +/-5°C, temperature variation within +/-0.5°C per hour during continuous measurement)

Interference:

Within +/-2.0 % of full scale, for 40 vol % water vapor in N2 base;
Within +/-2.0 % of full scale, for 10 vol % CH3OH in N2 base

Flow rate fluctuation effect:

Within +/-2.0 % of full scale
(at flow rate of 5.0+/-0.5 L/min, for both N2 and 100 vol % H2)

Ambient temperature effect

Within +/-3.0 % of the full scale at 30 +/- 5°C

Warm-up time:

Within 10 hours, after start-up of analyzer

5. Operating conditions

Environment:

  • In door use only
  • Ambient temperature between 20 - 40°C,*1
  • Air pulling out by fans from cabinet shall be ventilated safely withoutcoming in contact with flame*2

Sample gas flow rate:

2.0 - 5.0 L/min, as standard

Sample gas conditions*3:

  • Moisture to be below room temperature saturation
  • Dust to be removed through meshed filter finer than 0.3 mm
  • Water drop / oil mist not to be mixed
  • Gas temperature Room temperature at sample inlet of main unit rear panel
  • Inlet pressure to be controlled so as to keep flow rate within above range (with exhaust line opened to the atmosphere)

Exhaust line conditions:

Atmospheric pressure variation during use to be within +/-1kPa, to be emitted to the place or facility where H2 could be disposed of safely*2

6. Option

CO leak alarm:

CO: 150 ppm full-scale

Remarks

*1 If ambient temperature changes tremendously during measurement, output values might be effected regardless of the temperature being within the noted range. The room where the instrument is installed shall be equipped with an air conditioner so that the temperature will be stabilized.

*2 Sample gas and span gas that may contain hydrogen with high concentration are exhausted from two outlets of the instrument. These outlets shall be connected to the place or facility where hydrogen could be disposed of safely. The air exhausted from inside by the fan shall also be disposed of safely to the outside without coming in contact with fire.

*3 The MSHA-1000WS needs additional pumps or other equipment to supply gas to the sample inlet. Optional sampling unit could be applied for this purpose. In case of using other sampling unit, please refer to the specifications of the sample inlet conditions.

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