NEVADANANO MPS Manuel utilisateur

NNTS Proprietary Information

MOLECULAR PROPERTY SPECTROMETER (MPS )

FLAMMABLE GAS SENSOR

EVALUATION UNIT USER MANUAL

SM-UM-0001-02

Notices

SM-UM-0001-02 (062018)

1395 Greg Street, Suite 102

Sparks, Nevada 89431

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responsible for inaccurate information which may appear in this manual. For the latest product updates, consult the

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Table of Contents

System Overview and Setup ....................................................................................................................... 3

1.1 Kit Contents.................................................................................................................................. 3

1.2 Gas Testing Setup ........................................................................................................................4

1.3 System Setup ............................................................................................................................... 5

1.4 System Operation ........................................................................................................................ 7

Data Collection & Analysis......................................................................................................................... 10

1.5 Test Notes ................................................................................................................................... 11

1.6 Saving Data..................................................................................................................................12

General Guidelines ......................................................................................................................................13

Definitions ...................................................................................................................................................13

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System Overview and Setup

The Molecular Property SpectrometerTM (MPSTM) Flammable Gas Sensor Evaluation Unit is a user-

friendly sensor system developed for assessing flammable gas detection performance. The

evaluation system is shown in Figure 1. The sensor is 32.0 øx 13.8 mm with 1.5-mm connector pins

and connects to a provided PCB for communication with a PC (USB) or breakout to individual sensor

signals (optional 5-wire harness). The sensor contains the MPS MEMS sensing element,

environmental sensor, microprocessor, and supporting electronics inside a flame-proof housing. A

quarter-turn plastic gas mask and housing is included to provide a sealed headspace above the

sensor for test gas delivery.

Figure 1 –(a) MPS s7 Flammable Gas Sensor, housing, and gas delivery mask. (b) Sensor bottom-side detail.

1.1 Kit Contents

The complete MPS™Customer Evaluation Unit kit consists of:

MPSTM S7 flammable gas smart-sensor

MPS Sensor Interface software and drivers

Sensor PCB + housing

Gas delivery mask with integrated barbs

USB A to micro B cable

1/4” Tygon tubing (McMaster: 6516T17)

(b)

(a)

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1.2 Gas Testing Setup

The MPS measures molecular properties to determine the quantity of flammable gas present in a

sample. The system is optimized for "real-world" cases. As such, the effects of humidity,

temperature and pressure are automatically compensated out. However, sudden, wholesale

changes to the molecular properties of the sample--i.e. artificial changes which can only be

generated in a lab test rig--can lead to inaccurate MPS outputs. (This of course excludes changes due

to the presence of flammable gas.) An example of an inadvisable change (shown in Fig. 2c, d) would

be alternating between ambient air (which contains argon, carbon dioxide and other trace gases)

and flammable gas + synthetic "zero air" balance (which contains none of the trace constituent

gasses in ambient air). To simulate the real-world application (Fig. 2a) in artificial laboratory testing,

the same type of “air” must be used for the background and the carrier of the flammable gas for the

duration of the test. An example of a proper protocol is shown in Fig. 2b. Using a variation of the

“incorrect” procedure will invalidate the accuracy of MPS measurements.

The best practice for performance testing in a laboratory is to use a humidified zero-air background,

followed by a switch to a humidified analyte stream with the same zero-air composition as balance

gas, then a switch back to humidified zero-air to clear the test chamber. This mimics real-world MPS

performance, where flammable gas is introduced into relatively invariant ambient air (Fig. 2a).

Figure 2 –Correct testing of MPS in (a) real-world application and (b) laboratory environments. Incorrect test

procedures are shown in (c, d). In both cases, the analyte and carrier gas are dissimilar during the test, causing

inaccurate results.

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1.3 System Setup

The MPS Flammable Gas Sensor Evaluation Unit receives power and communicates to a PC via USB,

or via UART through 5-wire harness with V+, V-, TX, RX, and Analog out (optional) connections. The

MPS Sensor Interface is used to:

establish communication with the sensor to start, pause, and end tests

examine data in real-time

record test notes

save data to .csv file

The MPS Sensor Interface and accompanying drivers are available at:

https://www.nevadanano.com/MPS-Flammable-Gas-Sensor-Support

The user should first install the FTDI Driver, followed by a system restart, and then install the MPS

Sensor Interface UI. The setup procedure follows:

1. It is recommended to always power the computer connected to the MPS since the sensor

receives its power from the computer.

2. Connect the micro-USB cable to the MPS, then connect the opposite end of the USB cable to

a USB port on the computer. The MPS will automatically receive power from the computer.

5. Using the supplied ¼ -in tubing, connect the test gas system to one of the integrated barbed

connectors on the MPS gas mask.

Test gas should be supplied to the sensor at rates no greater than 300 mL/min.

The use of Nafion

tubing is recommended to humidify the test gas stream.

6. Attach the gas mask to the housing by aligning the arrow on the gas mask at the 10 o’clock

position and inserting the three tabs into the housing. Turn the mask clockwise until the

arrows on the housing and mask align and the mask “clicks” into place. The barbs will be

aligned across the horizontal axis of the housing.

Figure 3 –Proper gas mask attachment is achieved when the arrow points align and the barbs are in the horizontal

position.

For more information on Nafion, including its permeability for various gases, refer to:

http://www.permapure.com/products/nafion-tubing/

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7. Open the MPS Sensor Interface application from the desktop icon.

8. Click the “Find MPS Devices” button and select the MPS Flammable Gas Sensor connected to

the computer (Fig. 4). The sensor name is found on the sensor serial number in the form:

B12318003.

Figure 4 –(a) Selecting the active MPS™Flammables device. (b) Sensor name indicator

9. The MPS sensor is now ready for testing. Proceed to System Operation, and read thoroughly

before continuing

(a)

(b)

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1.4 System Operation

Figure 5 shows a typical benchtop test setup. A calibrated gas cylinder (e.g., zero-air, 50%LEL

methane in air) supplies gas from a 300-mL/min regulator via Nafion tubing to the gas mask. An

example of a suitable regulator is a 70-series fixed flow regulator, which is compatible with 34, 58,

74, 103 and 116 Liter aluminum cylinders as well as 103 Liter steel cylinders. Flow can be stopped by

removing the regulator or closing the black knob. The Nafion tubing humidifies the analyte gas

stream to ambient humidity levels without appreciable loss of analyte. The experimental test area

should have adequate ventilation to avoid exposure of gasses to the user. An additional zero-air gas

cylinder should be applied to the sensor when analyte gas is not flowed.

Figure 5 –(a) Typical test setup. (b) Detail gas and PC connections.

MPS Sensor Interface Software

Nafion

tubing

Test gas

cylinder

70-series Fixed

Flow Regulator

Exhaust

tubing

MPS

Inlet

Outlet

(a)

(b)

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1.4.1 Conducting a Gas Test

1. After performing system setup (1.3), the start button will now be enabled (highlighted in

green in Fig. 6). Start the flow of zero-air baseline gas over the MPS and wait ~1 minute

before proceeding for baseline gas to replace ambient air. Click Start to begin the initial

baseline acquisition.

Figure 6 –MPS™Flammables unit ready for testing. Sensor name is populated and start button is enabled.

2. The unit will acquire 10 baseline readings (Fig. 7, highlighted in green). After this stabilization

period, the sensor is ready for testing.

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Figure 7 –Acquiring sensor environmental baselines at the beginning of a test.

3. Next, apply a test gas cylinder and note the results. A stable gas reading should be displayed

within 30 seconds of applying a test cylinder as the supplied gas mask equilibrates with the

tank concentration.

4. After removing the test-gas cylinder, reconnect to a zero-air cylinder to purge the test gas

and continue to maintain a stable environment.

5. Repeat steps 3, 4 as needed to test various gasses and concentrations. When analyte is not

tested, it is important to keep the baseline/zero-gas flowing as the MPS smart-algorithms will

periodically record baselines.

1.4.2 System Shutdown

The MPS™Flammables sensor must be in an idle state before shutdown. Pause the current test and

wait for the system status dialogue to display “Idle”, then save or clear the data. The USB cable can

now be disconnected.

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