EVM Series: Frequently Asked Questions
Contents
1. EVM Series Frequently Asked Questions Particulate measurements i Question For particulate measurements how is the EVM 7 and EVM 3 calibrated in the factory Response Solution Each instrument is factory calibrated to the ISO 12103 A2 Fine Arizona Road Dust A factory calibration is conducted with a golden instrument that is calibrated using a certifiable gravimetric sample Quest Technologies recommends a yearly factory calibration 2 Question Do I need to calibrate before run real time particulate measurements Response Solution Yes it is recommended to perform a zero calibration in each environment you will be measuring particulates To perform a zero calibration ensure that the zero filter HEPA filter is attached the impactor is well greased and the turret is set to PM Then using the keypad navigate to Calibrate gt PM screen and perform a zero calibration Please see Chapter 4 of the EVM Series User Manual for specific details NOTE a zero calibration may be used when performing area survey monitoring However if you are testing in accordance to NIOSHO600 or if you want to measure the actual mass concentration in a specific environment you would run a gravimetric calibration to determine a correction factor referenced to the ARD 3 Question When test collecting real time particulate measurements for a period of time how do verify the calibration Response Solution First ensure you performed a zero calibrat2. M TSP 10 Question How often do you need to apply the grease to the impactors Response Solution The impactors will also require periodic cleaning and greasing which is dependent on the density of air particulates floating in the intended environment A relatively dusty environment approximately under10mg m3 should last an entire day When dust pyramids form on impactor plates this signifies they require cleaning and greasing Please refer to Impactor Care Section and the Optical Engine Maintenance and Cleaning Section in Chapter 7 of the EVM Series User Manual for cleaning details Particulate measurements 11 Question How do I know when to clean the optical engine photometer Response Solution The following conditions may occur 1 If calibrating the particulate PM sensor and it will not zero this indicates the optical engine will need cleaning 2 The instrument is exposed to oily or wet mists 3 The readings are falling lower and lower indicating the mirror is dirty Please see Chapter 7 of the EVM series manual for details on cleaning and maintenance Gravimetric Sample optional for particulate calibration 1 Question What is the backpressure capabilities inches water column Response Solution gt 15 inches of water 1 67 LPM 2 Question What type of cassette can be installed other than 37mm Response Solution Both 25mm and 37mm cassettes can be used in the EVM monitor 3 Question Can we run the unit with
3. er To apply select the dust override icon E and add a new value EVM Series Frequently Asked Questions 7 Question What do the impactor cut points represent Response Solution Depending on the environment and the industrial processes such as sanding cutting crushing grinding and transportation the type and size of the particulates will impact the human body in different areas affecting the nasal throat and or lung area The impactor cut points represent the particle size you will be sampling Inhalable dust is 100 microns and smaller This dust is usually filtered through the hairs and membranes in your sinuses 10 microns and smaller is thoracic and dust in the 4 10 micron size can get caught in you windpipe and other regions 4 microns and smaller is respirable and this is what causes concerns and the need for PM4 8 Question Is it possible to do an inhalable or respirable gravimetric sample Response Solution Yes it is possible to do inhalable and respirable gravimetric sampling This can be accomplished through the dial in impactors or with a cyclone in the open 4th hole on the turret This hole is used for zeroing the instrument as well as allowing the use of a cyclone in that inlet port 9 Question How do I set the cut points for particulate measurements Response Solution Turn the turret until the appropriate setting is displayed on the instrument s screen Settings include PM2 5 PM4 PM10 and P
4. ered with a PID sensor option A PID cleaning kit can also be ordered from Quest Technologies Part Number 074 080 See Chapter 7 Maintenance amp Cleaning of the EVM Series user manual for instructions on cleaning the PID lamp c How do we calibrate the PID Response Solution A PID calibration is a two point calibration consisting of a zero and a span calibration To perform a zero calibration Nitrogen gas or pure air should be used To perform a span calibration Isobutylene gas should be used if the specific VOC is unknown or a specific VOC gas can be used To calibrate the PID sensor navigate to the CALIBRATION PID screen and perform a zero and span cal by applying gas to the monitor using the supplied calibration cup See Chapter 4 of the EVM Series User Manual for details on PID calibration d How often is calibration recommended Response Solution Quest Technologies recommends calibrating the PID sensor prior to running a log session to adjust for sensor drift and wear 3 PID Correction Factors a Question Do you have a correction factor chart or a library of PID correction factors for various VOCs Response Solution Quest has included a correction factor chart with the various VOC s in Appendix C of the EVM series user manual Please reference as needed 4 Cleaning Maintenance Question a How do know when to clean the PID sensor for VOC measurements Response Solution A PID sensor error message will appear on the
5. ion prior to your testing with the supplied Zero HEPA filter Run your real time particulate measurements Then perform a Calibration PM Verify via the Verify softkey quick key Please see Chapter 4 of the EVM series user manual for specific details 4 Question What if need to calibrate particulates in accordance to NIOSH0600 Response Solution A gravimetric calibration is performed The steps below outline a gravimetric calibration Please see Chapter 4 of the EVM Series User Manual for specific details 5 Question How many correction factors can be stored on the monitor and in QSP II Response Solution The EVM supports 8 different particulate matter PM configurations profiles with customized name settings and user correction factor settings See Chapter 3 for instrument profile set up or Chapter 6 for QSP II set up of the EVM Series user Manual for more details 6 Question What if want to enter in the correction factor after running logging particulate measurements Response Solution You can adjust change the correction factor in QuestSuite Professional Il after the session has been downloaded The Dust Correction Override feature is a type of scaling factor that will re calculate the data instantly in the chart or graph you are viewing NOTE the Dust Correction Override field is displayed in the General Data panel and is applied to the dust measurements in the logged data chart table when dust is the selected paramet
6. isplay Solution 1 the gravimetric cassette may need to be replaced 2 detach any external devices such as a cyclone 2 How often do we need to calibrate the pump Response Solution Quest Technologies recommends an annual factory calibration If the user has an accurate flow meter such as a bubble flow meter the user may perform more periodic pump calibrations 3 How do we calibrate the pump Response Solution An accurate flow meter such as a primary standard calibrator and tubing is required to perform this calibration The primary standard calibrator tubing is inserted in the air flow outlet located at the back of the housing Navigate to the CALIBRATION FLOW RT screen Press the CAL quick key and then the START quick key Adjust the flow rate using the up and down arrow keys to 1 67 LPM and then confirm by pressing the SAVE quick key It should be noted that in order for the impactors to work properly the flow rate must be adjusted to 1 67 LPM 4 Can we adjust the flow rate Response Solution The flow rate can be adjusted see the How do we calibrate the pump question above It should be noted that in order for the impactors to work properly the flow rate MUST be adjusted to 1 67 LPM 5 How can we verify the constant flow Response Solution In order to verify the flow an accurate flow meter or primary standard calibrator is required The primary standard calibrator tubing is inserted in the air flow outlet loca
7. ity An accurate temperature sensing instrument i e pyschrometer is required to perform this calibration The instrument is then placed in the location where you will log and the calibration is conducted NOTE when calibrating relative humidity ensure the unit is not charging by unplugging the external power cord before proceeding NOTE before performing a user calibration ensure that your calibration is performed in an area known not to contain hazardous or interfering gases if ambient air will be used as the zero gas for operation If this is not possible pure bottled air Nitrogen is recommended should be substituted About Zero Calibration A Zero calibration is advised each time you log a session to adjust for drift in the sensor s sensitivity which occurs over time and after use About Span Calibration A span calibration proceeds a zero calibration and is used to set the linear measuring range The span should be a sizeable fraction of the selected full scale range of the gas lt a gt
8. out a cassette Response Solution The monitor should not be run without a cassette The monitor is installed with a pump protection filter cassette As its name indicates it protects the pump from particulate matter This cassette or a new cassette if performing a gravimetric sample should always be installed It should be noted that the pump protection filter cassette will periodically need to be cleaned or replaced 4 Question Does Quest offer cassettes Response Solution Quest Technologies offers a 5 pack of 37mm gravimetric cassettes for pump protection Order Part Number 074 076 5 Quest Technologies also offers a 10 pack order Part Number 074 090 lt a gt EVM Series Frequently Asked Questions Toxic Sensor measurements 1 Question How many toxics can measure simultaneously Response Solution One toxic sensor which is located in the left position of the housing 2 Question What s the life expectancy and warranty on the various Sensors Response Sensor Type Life expectancy Particulates sensor 5000 hours for the laser photo meter PID sensor for measuring VOC s 2000 hours in clean air environment replaceable bulb and grid Carbon Monoxide CO Chlorine CL2 Pump Airflow measurements 1 Question Will the pump always regulate Response The pump tries to maintain 1 67 lpm flow rate When the flow rate is not maintained the message Pump unable to regulate will appear on the screen s d
9. screen which indicates 1 clean the sensor 2 the lamp needs replacing Power 1 Question How long will the battery last with the EVM series Response Solution The battery is an internal lithium ion rechargeable battery pack which will last about 8 hours with continuous setup time run time and viewing your results time NOTE the battery is not user accessible or user replaceable Alarm outputs 1 Question Is there an alarm output Response Solution The Digital Out or digital output can be configured for any installed sensor at user specified threshold lt a gt EVM Series Frequently Asked Questions Calibrating sensors Question What calibration gases or calibration equipment are needed for calibrating sensors on the EVM series Sensor Type Zero Calibration Particulates sensor Performed with a zero HEPA filter shipped in kit Sensor Type Zero Calibration PID sensor Performed with Nitrogen or Pure Air NOTE Room air can be applied In clean air environments such as a school with no toxic cleaners present Advanced calibration correction factors Gravimetric filtering optional is used to determine a reference point correction factor relative to the Arizona Road Dust factory calibration Please refer to the EVM Series User Manual for details Span Calibration CO2 gas NOTE The range of the CO2 sensor is 0 to 20 000 ppm It is recommended to span cal to the value you will be mea
10. suring i e 10 000 ppm for best results Isobutylene is used when the VOC s are unknown NOTE in order to measure a specific VOC you will use the relevant VOC for your calibrated gas source Chlorine CL2 Performed with Nitrogen or Pure Air CL2 gas Ethylene Oxide EtO Performed with Nitrogen or Pure Air EtO gas Carbon Monoxide CO Performed with Nitrogen or Pure Air HCN Hydrogen Cyanide HCN Performed with Nitrogen or Pure Air HCN gas Hydrogen Sulfide H2S Performed with Nitrogen or Pure Air H2S gas Nitrogen Dioxide NO2 Performed with Nitrogen or Pure Air NO2 gas Nitric Oxide NO Performed with Nitrogen or Pure Air Oxygen 02 Performed with Nitrogen Room air NOTE The range of the O2 sensor is 0 30 with a typical span of 20 9 Sulphur Dioxide SO2 Performed with Nitrogen or Pure Air SO2 gas Sensor Type Pump Flow rate An accurate flow meter i e bubble flow meter and tubing is required to perform this calibration The tubing and flow meter are connected to the back outlet or in the turret Please see the EVM Series manual for details Temperature An accurate temperature sensing instrument i e thermometer is required to perform this calibration The instrument is then placed in the location where you will log and the calibration is conducted NOTE when calibrating temperature ensure the unit is not charging by unplugging the external power cord before proceeding Relative Humid
11. ted at the back of the monitor lt a gt EVM Series Frequently Asked Questions PID Questions for Volatile organic compound meausurements 1 Lamp Questions a Whatlamps will be available 9 8 10 6 11 7 eV Response Solution The EVM PID sensor supports a 10 6eV lamp b Will Quest Technologies consider PPB resolution in future for Microbials mold for IAQ Response Solution We are currently evaluating PID sensors with resolutions in the PPB range At this time the EVM PID sensor only supports a PPM resolution sensor For the question regarding measuring MOLD this is not detected with the PID sensor Instead at high enough concentration it may appear in the particulate mass concentration depending on particle sizes of 0 1 to 10 um c Will we offer a moisture trap or hydrophobic filter attachment Response Solution Each gas sensor installed in the EVM including PID has a hydrophobic filter contained in the sensor housing 2 Maintenance Questions a Is the lamp field replaceable Response Solution The PID lamp can be replaced by the user in the field A replacement lamp can be ordered from Quest Technologies Part number 074 081 See Chapter 7 Maintenance amp Cleaning of the EVM Series user Manual for instructions on replacing the PID lamp b Can the lamp be cleaned in the field Response Solution The lamp can be cleaned in the field with the PID cleaning kit A PID cleaning kit is shipped with an EVM unit if ord
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