Sensit VMD Manuel d'installation

SENSIT® VMD

SETUP &OPERATING INSTRUCTIONS

FOR YOUR SAFETY

NOTICE: This safety symbol is used to indicate a potentially hazardous situation which, if not avoided, may result

in minor or moderate injury.

WARNING: Disassembly and maintenance is forbidden in explosive atmosphere.

WARNING: Follow the manual instructions and testing methods.

WARNING: Any disassembly or repair of the instrument must be done by a factory certified technician.

WARNING: Clean lenses prior to each use with a lint free or microfiber cloth for best results.

WARNING: When not in use refer to transport position recommendation to prevent potential damage.

WARNING: While the VMD is weather resistant, it is recommended to remove the instrument and store it in the

vehicle when necessary to avoid prolonged exposure to extreme weather (i.e. heavy rain or snow).

DANGER: Use extreme caution when monitoring the tablet computer when driving. Rely on the audible alarm

instead of any visual indication while driving. Any adjustment should be made only when the vehicle is safely

stopped and away from traffic.

CONTENTS

For Your Safety....................................................................................................................................................................................2

Contents...............................................................................................................................................................................................3

Parts and Accessories..........................................................................................................................................................................4

Standard Parts (Included)................................................................................................................................................................. 4

Mounting Kit (VMD)..........................................................................................................................................................................4

Accessories......................................................................................................................................................................................4

Mounting Kit (Tablet)........................................................................................................................................................................4

Product and Technology Description....................................................................................................................................................5

Specification.........................................................................................................................................................................................6

Sensor Specifications.......................................................................................................................................................................6

Product Specifications......................................................................................................................................................................6

Explanation of ppm/m...........................................................................................................................................................................7

Installation............................................................................................................................................................................................ 8

Install VMD Instrument.....................................................................................................................................................................8

Install Tablet Computer ..................................................................................................................................................................10

Getac Tablet Connections.............................................................................................................................................................. 11

User Interface.....................................................................................................................................................................................12

Description of Interface Buttons .....................................................................................................................................................13

User Setup Tab .............................................................................................................................................................................. 15

Operation and Use............................................................................................................................................................................. 16

Calibration.......................................................................................................................................................................................... 17

Advanced Calibration ......................................................................................................................................................................... 18

Plotting Surveys ................................................................................................................................................................................. 19

Converting to .kml and Exporting ...................................................................................................................................................19

Pairing a PMD....................................................................................................................................................................................20

Importing Calibration Data Into SCAL ................................................................................................................................................21

Export Data from Tablet to Removable Media................................................................................................................................21

Import Data into SCAL....................................................................................................................................................................21

Troubleshooting..................................................................................................................................................................................22

Communication Issues and Re-Pairing Bluetooth Connection....................................................................................................... 22

Double Check the Following Items:............................................................................................................................................22

Power Cycle VMD and Tablet ....................................................................................................................................................22

Re-Pairing Bluetooth Connection ...............................................................................................................................................23

Notes..................................................................................................................................................................................................25

Warranty............................................................................................................................................................................................. 28

PARTS AND ACCESSORIES

STANDARD PARTS (INCLUDED)

360-00481 VMD Bluetooth antenna

360-00482 Tablet Bluetooth antenna

385-00159 Tablet Bluetooth antenna extension cable

(right angle)

330-00097 Tablet Bluetooth antenna clamp

360-00471 Tablet GPS antenna

385-00114 VMD power harness assembly

385-00160 Tablet vehicle power supply

360-00517 Tablet dock

882-00092-SN Calibration cell (with mounting arm and

thumbscrew)

882-00137 Extra power harness cover

360-00430 5A automotive fuse for power harness

MOUNTING KIT (VMD)

870-00428 Mounting kit (includes parts below)

330-00078 Hitch pins (2)

360-00426 Jam bolt

360-00427 L-bracket

360-00428 VMD bar bracket

360-00429 Hitch stabilizer

ACCESSORIES

870-00076 VMD shield

MOUNTING KIT (TABLET)

870-00074 Mounting kit (includes parts below)

360-00473 Base w/ 2” Ball & Clamps

360-00474 Arm

360-00475 Plate (VESA 75)

PRODUCT AND TECHNOLOGY DESCRIPTION

The SENSIT VMD is a vehicle-mounted natural gas leak survey instrument. It uses IR Absorption Spectroscopy technology

for extremely accurate and consistent readings that are entirely methane specific. The SENSIT VMD uses an open-path

system, which consists of 2 modules that are mounted on a bar. One half emits a light source, which travels through the

space between the modules into the other half which receives the signal. The amount of natural gas (methane) in the path

affects how much of the light source is absorbed, which is translated into a parts-per-million-per-meter (ppm/m) reading.

The entire assembly is mounted to the front of a vehicle on a large L-bracket, which is received by a 2” hitch. The SENSIT

VMD is powered by a single cable coming from the battery of the vehicle, and can be removed easily to allow for very fast

and simple removal and storage of the instrument. The data it gathers is sent via Bluetooth to a rugged tablet computer in

the cab of the vehicle. The user is shown readings in real time (at a rate of one reading every 200ms), on a very easy to

read graphical interface.

The SENSIT VMD, in addition to using Bluetooth communication, also utilizes a built-in GPS module in the tablet. Combined

with the software’s logging capabilities, the user can map a survey directly into Google Earth, to see a detailed map of the

survey with a breadcrumb trail of the path driven and readings found.

SPECIFICATION

SENSOR SPECIFICATIONS

Sensitivity: 0.1 ppm/meter methane at a max speed of 25mph

Measurement Range: 1.0 to 1000 ppm/meter

Display Range: Automatic

Accuracy: ±10%

Alarms: Audible with adjustable set point

PRODUCT SPECIFICATIONS

System Voltage: 10-16 VDC

System Power Requirements: 84 watts max @ 12 VDC

VMD Size: 4 ft. to 8 ft. path length (5 ft. Standard)

Tablet Weight: 1.94lbs (0.88kg)

Tablet Size: 8.93” x 5.94” x 0.94” (227 x 151 x 24mm)

VMD Weather Resistance: IP54

Tablet Weather Resistance: IP65

Operating Temperature Range: -20˚F to 122˚F

Operating Humidity Range: 5 to 100% relative humidity

Installation Time: < 2 hours (typical)

EXPLANATION OF PPM/M

The SENSIT VMD displays its readings in parts per million per meter. This is a representation of the average gas

concentration over 1 meter, or roughly 3.3 feet. Many types of IR and laser based technology in the industry uses this

standard. For implementations that are not fixed point, and have a variable path length, the unit used is ppmm (parts per

million meter). The difference being that the reading would be a factor of the total distance of the path length, which can

change as the size of the gas plume changes.

In the case of the VMD, the path length is fixed at slightly more than 1m, which is taken into account in the software, and we

therefore say the reading is “per meter”, meaning over the total length, since it never changes.

However, this reading is still essentially an average. For example, consider the following images:

On the left, there is a natural gas plume with a concentration of 40ppm, spanning 0.5m. On the right, there is a plume with

a concentration of 80ppm, spanning 0.25m. Both of these scenarios will yield the same reading of 20ppm/m. The plume

on the right is double the concentration, but half the distance, meaning the average concentration over the path length will

remain the same.

~1 meter

0.5 meter

40ppm

0.25 meter

80ppm

INSTALLATION

INSTALL VMD INSTRUMENT

1. Install a 2” front-mount hitch on the front of the vehicle. If a bolt on hitch cannot be sourced, a local welding shop should

be able to mount one for you as pictured below.

2. Insert the short end of the L-bracket into the hitch with the long side facing up. There are several adjustment holes for

distance in and out from the bumper. Insert the pin and install and tighten the hitch stabilizer. The hitch stabilizer

tightens the L-bracket to the hitch, and therefore the frame of the vehicle. This ensures that no extra vibrations are

transferred to the VMD.

INSTALLATION

3. Ensure that the jam bolt is backed out from the

bracket that is mounted to the VMD. Slide the

VMD and mounting bracket over the L-bracket,

lower the VMD to the desired position, and insert

the pin. Tighten the jam bolt. It is recommended

to use an anti-seize compound on the jam bolt.

4. Install the power harness assembly.

a. Route the power harness through the grill

and engine compartment to the battery. The

harness is 10ft long and should have some

slack left over.

b. The battery end of the power harness has two exposed wires, red for the positive terminal of the battery and black

for negative. Secure these wires to the battery. One method is to use crimp-on ring terminals that can then be

bolted to the battery terminals.

c. Plug in the power connector to the VMD.

d. It is recommended to use dielectric grease on

all connections to prevent corrosion.

INSTALLATION

INSTALL TABLET COMPUTER

There are various methods for mounting the tablet computer. There is not a universal mounting system that will fit all

vehicles, and therefore Sensit does not provide a full tablet mounting solution. What is provided is a ball-joint bracket and

mounting arm. The ball-joint and mounting arm can be attached to the back of the tablet with the provided hardware. The

arm can then be secured to a pole that is mounted in the cab of the vehicle (not provided). On an ATV or utility vehicle

application, there will usually be a roll bar or other similar structure that the arm can be attached to.

Alternatively, after market computer/tablet mounts are available from a variety of vendors. Most commonly, these will use

an arm or adjustable pole that will bolt to the front-passenger seat mounting points. This can either be the full solution

(which will mount to the tablet) or can sometimes be used in conjunction with the provided ball-joint and arm.

If you need assistance with this, contact SENSIT Technologies.

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