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Multi gas leak detector
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- Contents
- Table of Contents
- Troubleshooting
- Bookmarks
Table of Contents
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User Safety Warnings
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Table of Contents
- 1 Specifications
- 2 List of Kit Contents
- 3 Unpacking Your New MGD-2002
- 4 Tracer Gas
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Helium Vs Hydrogen as a Tracer Gas
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Other Gasses the MGD-2002 will React too
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- 5 Assembling the MGD-2002 for Use
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Humidity Vs Accuracy
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Moisture Filter
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- 6 Operation of the MGD-2002
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Overview
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Charging the Battery
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Power Supplies
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Charging the Battery from a 12VDC Auto Adaptor
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Charging the Battery Using the Universal Power Supply
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Replacing the Battery
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Button Function and Operation
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Liquid Crystal Display (LCD)
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Display Status Icon
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- 7 Tracer Gas Leak Locating for Piping Systems
- 8 Leak Locating for Pressurized Cables
- 9 Serial Port (if Equiped)
- 10 Maintenance
- 11 Calibration
- 12 Frequently Asked Questions (FAQ)
- 13 Troubleshooting
- 14 Service Information
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Warranty
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Model MGD-2002
Multi Gas Leak Detector
Instruction manual
IB-417 REV. I PART NO. 84671
Table ofContents
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Table of Contents
Summary of Contents for Dielectric MGD-2002
- Page 1 Model MGD-2002 Multi Gas Leak Detector Instruction manual IB-417 REV. I PART NO. 84671...
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Page 2: User Safety Warnings
User Safety Warnings IMPORTANT: Before operating the device for the first time, read all of the following safety guidelines. To prevent personal injury, property damage, or damage to the detector, operate it only in accordance with these safety guidelines. • Do not operate the device if it has been damaged. Contact SPX Radiodetection for advice. -
Page 3: Table Of Contents
List of kit contents Unpacking your New MGD-2002 Tracer gas 4.1 Helium vs Hydrogen as a tracer gas 4.2 Other Gasses the MGD-2002 will react too Assembling the MGD-2002 for use Operation of the MGD-2002 6.1 Overview 6.2 Humidity vs Accuracy 6.3 Moisture filter... -
Page 4: Specifications
1.0 Specifications Dimensions: (LxWxD) 13.3in x 4.9in x 3.3in (33.7cm x 12.3cm x 8.3cm) Weight: (MGD-2002 only) 3.1 lbs (1400 grams) (Shipping) 15.0 lbs (6800 grams) Temperature Range: +40°F to +110°F (+4°C to +43°C) Humidity Range: 20% RH to 50% RH... -
Page 5: List Of Kit Contents
2.0 List of kit contents Description Part No. 1. MGD-2002 gas detector 79766 2. 12VDC Auto Adaptor charger 163-0005-01 3. Ground probe with Collection cup 90664 4. Spare moisture filter cartridge 83220 5. Sampling handle 83174 6. Needle probe 84165 7. -
Page 6: Unpacking Your New Mgd-2002
3.0 Unpacking your New MGD-2002. 3.1 Upon delivery 1) Open the shipping package and inspect the MGD-2002 for any physical damage that may have been caused during shipping. Keep the packing material in case you ever need to return the device to SPX Radiodetection. -
Page 7: Tracer Gas
Unfortunately methane even in very low concentrations can cause the MGD-2002 to react but this is generally only seen during certain environmental tests. -
Page 8: Assembling The Mgd-2002 For Use
When the sample probe is at the required length, release the lock button, ensuring it engages in a locking position. 4. Turn the MGD-2002 on. The MGD-2002 will perform a self check and zeroing routine (1 min approx). You are now ready to look for Helium/Hydrogen... -
Page 9: Operation Of The Mgd-2002
6.0 Operation of the MGD-2002 6.1 Overview The MGD-2002 gas detector is a portable leak-locating and pinpointing device that can be used in a multitude of pressurized systems to detect both hydrogen and helium when used as a tracer gas . Because they are both lighter than air, hydrogen and helium penetrate small leakage points rapidly. -
Page 10: Power Supplies
20 min for the battery temperature to return to normal before using the device. Note: It is not possible to use the MGD-2002 during battery charging as the detection capability is automatically dis- abled when the battery charger is plugged in. -
Page 11: Charging The Battery Using The Universal Power Supply
2. Plug the DC adapter lead into the charging connector located on the right hand side of the MGD-2002 Note: When the charger is plugged into the MGD-2002 the LCD will illuminate and display the battery recharging symbol. Once charging is complete the symbol will change back to a plug 6.7 Charging the battery from a 12VDC auto adapter... -
Page 12: Replacing The Battery
6.8 Replacing the battery Caution - Do not mutilate, puncture, or dispose of bat- teries by placing them in a fire. The batteries can burst or ex- plode, releasing hazardous chemicals. Discard used batteries in accordance with the battery manufacturer’s instructions and your local regulations. -
Page 13: Button Function And Operation
6.9 Button functions and operation The MGD-2002 features membrane buttons, and has a large multi- function liquid crystal display (LCD). Each button has a raised embossed edge that is designed to be felt by a user even when wearing protective gloves. When they are pressed, the buttons make a noticable “click”... - Page 14 PUMP SPEED Allows manual selection of various pump speeds to increase accuracy of the sample reading in situations with very small leaks. At slower speeds the unit draws in less ambient air with the sample. The Reset button allows the unit to re main RESET pow ered up while clearing all the internal logic cir cuit ry.
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Page 15: Liquid Crystal Display (Lcd)
6.10 Liquid Crystal Display (LCD) The LCD is a near real-time display of the tracer gas concentration the unit has detected. The refresh rate is slightly greater than ten times every second. After the unit is switched on. This screen will remain displayed while the processor conducts a power on self test, which lasts for approximately 60 seconds. -
Page 16: Display Status Icon
6.11 Display status icons There are five small icons shown at the bottom of the LCD screen. The icon as well as its function is displayed below. The icons are listed in the order in which they are displayed on the LCD, from left to right. -
Page 17: Tracer Gas Leak Locating For Piping Systems
7.0 Tracer gas leak locating for piping systems 7.1 Assumptions: • You have read and understand all safety information ex pressed or implied in this MGD-2002 Instruction Manual as well as your local safety codes and requirements. • You have pinpointed the location of the system under ground •... - Page 18 7.5 Locate the system Locate and mark the piping system path in the projected search area, noting any recent construction or ground shifting in the area that may have caused damage to the piping system. (There are a large variety of pipe/cable locators available from SPX Radio- detection.
- Page 19 it to go up hill. Additionally, you will need to vent the other end of the system until tracer gas can be detected at this vent. This will ensure you that the tracer-gas has reached the leak. Once detected at the vent, the vent can be closed and the system can be pressurized with tracer gas.
- Page 20 100% concentration in the system. That would be a waste of tracer gas. 5-10% is certainly adequate for leak locating as the MGD-2002 is capable of reading Helium as low as 25ppm (1%= 10,000ppm). Another challenge for very large diameter pipe (> 2ft) and tanks...
- Page 21 7.10 Estimating charging times The charging times, pressure used, and the amount of tracer gas needed are dependent on the size of the pipe and the expanse of the piping system being tested. Additionally, the size of the leak and the material over the pipe (loose earth, clay, concrete, pave- ment, vinyl sheeting) affect the time for the tracer gas to reach the surface of the ground.
- Page 22 (plume) thus too much Helium too fast can make pinpointing more difficult. 7.13 Preparing the MGD-2002 detector Assemble the black tube of the foam covered handle to the con- trol unit, attach the ground probe (yellow stick) to the handle. Turn the detector ON and allow it to complete its 60 sec self-test.
- Page 23 • Do not suck up water into the unit (damage will result) • Do not plug the battery in backwards (damage will result) • Allow the MGD-2002 to normalize to the temperature of the search area before turning it on. Rapid changes in temperature can cause condensation to build up on the sensor shorting it out and requiring factory repair in most cases.
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Page 24: Leak Locating For Pressurized Cables
8.1 Assumptions: • You have read and understand all safety information ex pressed or implied in this MGD-2002 Instruction Manual as well as your local safety codes and requirements. • You have pinpointed the location of the system under ground •... - Page 25 The highest concentration of helium/hydrogen will be along the cable path, with the highest reading directly over the cable leak. Before using the MGD-2002, mark the path of the cable. Precise cable location can be accomplished while the cable is being charged with tracer gas.
- Page 26 Charging a cable or air pipe system When applying the tracer gas to a distribution panel use the Model 526 & 530 for panel applications. If you do not use the model 526 & 530, or a locally assembled equivalent, the cables may not all be charged with the tracer gas.
- Page 27 8.6 Directly charging the cable. When applying the tracer gas directly to a cable refer to the chart (page 31). This chart shows the amount of time needed for the helium/hydrogen to flow to the suspected leak location. This chart should be used whenever tracer gas is introduced directly into the cable.
- Page 28 per hour (SCFH), divide the number found in the column for one SCFH by the flow rate. The result is the number of hours per thousand feet for that flow rate and cable diameter. e. Multiply the time found by the length of cable you want to charge. This is done in number of thousands of feet.
- Page 29 8.7 Direct Buried Cables: (a) Introduce helium/hydrogen at the valve point closest to the area of the suspected leak. (i) Attach a model 530 helium flow controller to the helium/ hydrogen tank regulator (see the "530 helium flow con- troller operations manual"). (ii) Attach the inlet hose of a model 526 portable flow rater to one of the valves at the end of the model 530.
- Page 30 8.8 Underground cables: a. Introduce tracer gas at the meter panel in the central office that feeds the leaking cable. b. The tracer gas will flow into the underground cable from manhole locations or riser pole valves instead of the central office.
- Page 31 At the manholes, set up work-area protection according to local practice. Without removing the manhole cover do the following: a. Switch on the MGD-2002 and following the startup cycle, insert the extension tip of the probe through one of the holes in the manhole cover.
- Page 32 Using duct probe with multisonic tip to pinpoint leaks in conduit If tracer gas is detected in a duct the SPX Radiodetection Model 1802 mini duct probe may be used to establish the exact location of leaks between manholes (fig 9). If pressure leaks are not found in the manholes or adjacent ducts, the pressure leaks may be in riser cables or riser cable plugs.
- Page 33 8.11 Leak Locating tips; • Locate and mark the cable path in the projected search area • Ensure the rubber collection cup is placed on the ground directly over the path of the cable during the "sample" and read" cycles •...
- Page 35 APPENDIX B Approximate Cable fill times Approximate cable fill times based upon head end flow rates stated in hours per 1000 feet Cable diameter in inches 2.75 1.35 2.35 1.75 1.15 8.85 2.95 1.25 10.9 5.45 3.65 2.75 1.55 13.2 2.65 1.85 1.65...
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Page 36: Serial Port (If Equiped)
9.0 Serial port (if equipped) A serial port can be added to the MGD-2002 Contact customer service for more information. Data is sent at 57600, n, 8, 1 in ASCII format with a carriage return (0x0D) and line feed (0x0A) after each value so it reads out fine in Hyper Terminal. - Page 37 10.2 Moisture Filter replacement In order to replace the Moisture (silica gel) filter, firmly grip the filter handle with one hand and turn the knurled cap assembly counter clockwise until they separate. Once the cap assembly is removed, push the filter out by using the viewing holes in the handle.
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Page 38: Calibration
11.0 Calibration: The MGD-2002 is a precision measuring device that requires fac to ry calibration in order to ensure continued and sustained op ti mum op er at ing per for mance. The amount of time be tween calibration cycles is de pen dant upon the environment in which the device is to be used, the end us er’s cri te ria for the equipment, and... -
Page 39: Frequently Asked Questions (Faq)
12.0 Frequently asked questions (FAQ’s) Q: Why do sudden movements cause the detector to react? A: Sudden movements such as rapidly swing the unit from a hori- zontal position to a vertical position can make the detector tem- porally display between 25 & 50ppm . This is caused by air move- ment disruptions inside the control unit and is normal. - Page 40 on proper usage in these applications. Q: Will this detector completely eliminate the need to drill holes in pavement or concrete? A: No, although it can reduce this need it will not eliminate it. Sev- eral inches of pavement will substantially slow the permeation of Helium/Hydrogen to the surface, which can cause pluming of gas under the pavement making it more difficult to pinpoint the leak.
- Page 41 12.1 Hints: • You can use a standard Helium balloon (latex) to practice leak locating. The MGD-2002 will detect helium leaking through the surface of the balloon. • A sample of 100% helium will not damage the sensor. • Ensure the rubber cup is placed directly on the ground over the path of the system during sampling.
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Page 42: Troubleshooting
13.0 Troubleshooting The pump seems to be straining and no air is exiting from the out- let port (brass) on the right side of the control unit. • Check that the handle section and the ground probe or needle probe is properly installed. •... -
Page 43: Service Information
NOTE: Do not ship equipment contaminated with any type of hazardous/harmful substance. SPX Dielectric 28 Tower Road, Raymond ME. Phone (207) 655-8525 Toll Free : (877) 247-3797 Fax: (207) 655-8535... -
Page 44: Warranty
Tel: (207) 655-8525 Toll Free: 1-877-247-3797 Fax: (207) 655-8535 Email: rd.sales.us@spx.com www.radiodetection.com © 2017 Radiodetection Ltd. All rights reserved. Radiodetection is a subsidiary of SPX Corporation. Dielectric is a trademark of Radiodetection in the United States and/or other countries. Due to a policy of continued development, we reserve the right to alter or amend any published specification without notice.
