Quest Engineering EVM Series Bedienungsanleitung

EVM Series Environmental Monitor

QUICK START

GUIDE

EVM and User Interface

Indicators

Softkey Menus

Up Arrow Key

Altf

Key

Enter Key

Right Arrow Key

Down Arrow Key

On/O and Esc Key

Display

Backlight

Particulate Pump

Left Arrow Key

Run/Stop Key

Turning On/O and Navigating

1. Press key power on. (Following a splash/welcome screen, the Start screen will appear.)

2. Navigating to measurement screens - press keys.

+ Navigating to menu options - press keys.

+ To open a selected menu or to save settings - press key.

3. In the powered on mode, press and hold key to power down the instrument.

Start Screen and Measurement Views

You will visit the start screen frequently to access measurements, setup, calibration, unit info,

and le system screens.

+ Press keys to access the measurements screens.

+ To select a menu option, press keys.

Align to Impactor Arrow

PM 2.5

Overview of running measurements

Quick Help List: typical gas, particulates, or air quality measuring overview

1. Turn the EVM on and check the battery power.

2. Reset/Clear memory, if necessary (Start\File System menu). This will clear out data history

before your logging begins to ensure you have sucient memory space.

3. Set-up your session parameters either in Quest Detection Management Software (DMS)

or via the instrument’s Setup screen.

4. Verify the time and date is set correctly (Setup\Time-Date menu).

5. Calibrate each sensor/parameter via the Calibration screen.

6. Place the EVM in a specic location for area monitoring.

7. Press the key to Start logging.

8. When you are ready to end your logging, press key.

9. Review your results either on the instrument (via the File System screen) or download to DMS for

further analysis (graphs/charts, saving and printing).

Particulate Measurements

Particulate setup

1. To change particulate settings select: Setup\Particulate.

2. Particulate screen appears and includes the following adjustable elds:

+Particulate eld (enable/disable pump collection), Prole eld (applying a correction factor), and

Gravimetric mass/volume elds (displays accumulated mass and air volume. These elds are

reset when performing gravimetric sampling.)

Adjusting the Impactor

To adjust the impactor, turn the turret until one of

the following is selected: PM2.5, PM4, PM10, or PM

(all dust ranging from 0 μm-100 μm).

+ The example (to right) illustrates the impactor

set to PM 2.5.

NOTE: The dialed-in impactor setting is displayed

on a particulate measurement screen or

calibration screen .

Zero/HEPA Filter Example

Used for particulate zero cal.

Tubing and Vent Opening

Insert tubing into the

impactor of the labeled “2.5”

vent opening

Turret

Turn the turret so “PM”

appears on the display of

the EVM.

Particulate Zero Calibration

Prior to calibrating, ensure the impactors are well-greased with an applied thin-lm of silicone grease.

(Please see “Impactor Care” on page 10 of EVM series user manual.)

1. Attach the Zero/HEPA lter and tubing

into the turret. Rotate the turret to PM.

2. Select Calibration from the Start screen

and select PM (using up/down arrows).

3. Press Cal softkey and then press

Start softkey. Once level is stabilized,

press Set softkey.

4. Once level has been set, you can press

Save or Cancel. (Please refer to

Chapter 4 of EVM series manual for

more information.)

NOTE: Once saved, the instrument will apply the zero calibration to all proles. The zero calibration is

stored in the History screen and a calibration. Verify can be performed (to ensure no drifting).

Particulate Advanced Calibration (Gravimetric)

Gravimetric Calibration Overview

(1)Reset the gravimetric and volume accumulators; (2) Insert a new (sealed) gravimetric cassette;

(3) Measure in the specic location for approximately four to eight hours; (4) Record the value displayed

in the gravimetric accumulator eld displayed in the particulate screen. (This value is used in conjunction

with the weight of the measured dust in the cassette.); (5) Remove the gravimetric cassette and weigh

the ltered contents. (Typically, send to a lab for results.); (6) To determine the correction factor, calculate

the ratio between the particulate mass value and the weight from the gravimetric lter lab analysis.

(Ratio = true weight/EVM gravimetric displayed value). (7) Enter user correction value (Setup\Particulate

screen. Select prole eld and then press Edit softkey. Add Factor using up/down arrows. Press On/OFF/

Esc key twice to return to start screen.)

Logging Particulates

1. Before logging particulates, ensure the impactors are clean and well-greased.

2. From the start screen or any measurement screen, press key .

3. Press key to end the logged session. (See “Viewing logged results” to access past sessions.)

PID Sensor

Measurement

Run Icon

Gas

Measurement

Screen

Volatile Organic Compounds (VOCs)

VOCs, air pollution with carbon-containing chemicals, are measured using a Photoionization detector

10.6eV. The EVM is equipped to notify you when maintenance and cleaning is required for the PID

sensor. A PID sensor error will appear indicating:

(1) if the sensor needs to be cleaned, or (2) the lamp needs replacing.

PID Zero Calibration

The PID ppm zero calibration preferred method is to ush with Zero Grade Air. Alternatively, Nitrogen

may be used. For best response time, it is recommended to set the ow rate at 1 LPM.

NOTE: Please refer

to the EVM series manual for more information on the PID ppm/ppb sensors.

1. Connect the Zero Grade Air, tubing, and calibration cup to the EVM.

(Please skip this step if you are not applying a gas.)

2. Select Calibration from the Start screen and select PID (using up/down arrows).

3. Press Cal softkey and then press Zero softkey. Once level is stabilized, press Set softkey.

(Typically takes 60 seconds to stabilize.)

4. Once level has been set, you can press Save or Cancel. (Disconnect components and return to the

start screen via On/O/Esc key.)

PID Span Calibration

Typically, Isobutylene is used when the VOCs are unknown.

NOTE: in order to measure specic VOCs, you

will want to use the relevant VOC for your calibrated gas source for a ppm/ppb sensors.

(Please refer to the manual for PID correction factor table; Appendix C for details.)

1. Connect Isobutylene, regulator, tubing and cal cap to the EVM.

2. Follow steps 2-4 above (in PID Zero Cal. section) but select Span softkey instep 3.

Logging VOCs

1. From the start screen or any measurement screen,

press key.

+ To view VOCs measurements, select either the Gas

or Composite screen by pressing keys from the

start screen.

2. Press key to stop logging. (See “Viewing logged

results” to access past sessions.)

Tubing

Regulator

Cal. Gas Source

Cal. Cup/Adapter

Toxic Gases

The following toxic gases table displays a quick overview of the ranges and the gases needed to perform

zero and span calibrations.

Type of Gas Range Res. Zero cal gas Span cal gas

Carbon Monoxide (CO) 0 -1000 ppm 1 ppm nitrogen/pure air CO

Chlorine (CL2) 0.0 - 20 ppm 0.1 ppm nitrogen/pure air CL2

Ethylene Oxide (EtO) 0.0 - 20 ppm 0.1 ppm nitrogen/pure air EtO

Hydrogen Cyanide (HCN) 0.0 - 50 ppm 0.1 ppm nitrogen/pure air HCN

Hydrogen Sulde (H2S) 0 - 500 ppm 1 ppm nitrogen/pure air H2S

Nitrogen Dioxide (NO2) 0.0 - 50 ppm 0.1 ppm nitrogen/pure air NO2

Nitric Oxide (NO) 0.0 - 100 ppm 0.1 ppm nitrogen/pure air NO

Oxygen (O2) 0.0 - 30% 0.1% nitrogen

*1.0 L/min. ow rate

Room air

*span 20.9%

Sulphur Dioxide (SO2) 0.0 - 50 ppm 0.1 ppm nitrogen/pure air SO2

Carbon Dioxide Gas

Similar to toxic gases, the carbon dioxide sensor should be calibrated prior to logging.

Toxic and Carbon Dioxide Zero Calibration

Depending on the gas of interest, the toxic zero calibration is performed with the gas indicated in the

table above. The CO2sensor requires a calibration gas, a regulator with at least 1.0 Liter/minute ow rate,

and a hose/tubing. Nitrogen (N2) is the recommended gas for a zero calibrating (If you are not applying a

gas, start at step 2.)

1. Connect the appropriate gas/pure air, regulator, tubing, and

calibration cup to the EVM.

2. Select Calibration from the Start screen and choose a specic

toxic using keys. (i.e., CO).

3. Press Cal softkey and then press Zero softkey. Once level

is stabilized, press Set softkey. (Allow at least 90 seconds

to stabilize.)

4. Press Save or Cancel softkey to store the process. Disconnect

components and return to the start screen via On/O/Esc key.

Toxic (CO)

Value

Run Icon

Composite

Measurement

Screen

CO2Value

Toxic and Carbon Dioxide Span Calibration

To perform a span calibration with a specic toxic gas, please reference the toxic gas table. For the

CO2span calibration, the range (or span) should be a sizeable fraction of the selected full scale range

of the gas.

NOTE: The range for the CO2sensor is 0 to 5,000 ppm. For a span calibration, it is recommended to span

cal to the value you will be measuring (i.e., 2,000 ppm).

1. Connect the appropriate gas, regulator, tubing and cal cap to the EVM.

2. Follow steps 2-4 (in Toxic Zero Calibration section) but select Span softkey in step 3.

(NOTE: For Oxygen span calibration, the typical span is 20.9%.)

Logging Toxic Gases or Carbon Dioxide

1. From the Start screen or any Measurement

screen, press key.

+ To view gas measurements, select either the

Gas or Composite screens (by pressing from

the start screen when Setup is selected.

2. Press key to stop logging. (See “Viewing

logged results” to access past sessions.)

Particulate advanced calibration (Gravimetric ltering)

Gravimetric Calibration Overview

(1)Reset the gravimetric and volume accumulators; (2) Insert a new (sealed) gravimetric cassette;

(3) Measure in the specic location for approximately four to eight hours; (4) Notate the value displayed

in the gravimetric accumulator eld (displayed in the particulate screen. (This value is used in

conjunction with the weight of the measured dust in the cassette.); (5) Remove the gravimetric cassette

and weigh the ltered contents. (Typically, sent to a lab for results.); (6) To determine the correction

factor, calculate the ratio between the particulate mass value and the weight from the gravimetric lter

lab analysis.

Measuring particulates

1. From the start screen or any measurement screen, press the key.

(Prior to logging, a 5 second count-down appears.)

2. Press key to end the logged session. (See “Viewing logged results” to view past sessions.)

Temp/RH

Measurements Temp/RH

Measurement Screen

Air Flow Outlet

*To calibrate,

connect primary

standard calibrator

with tubing

AirProbe Inlet

with Attachment

Temperature and Relative Humidity

Logging/Viewing Temperature and/or Relative Humidity

The Temperature and Relative Humidity readings are viewable in either the Temp-RH measurement

screen or in the Composite screen.

Particulate Air Flow

Calibration

For Airow meter calibration, an accurate ow meter (such as a primary standard calibrator) and tubing

is required.

1. Attach the primary standard calibrator tubing to the air ow outlet.

2. Navigate to the Setup\Calibration\Flow RT (rate) screen.

3. Press the Cal softkey and then press Start softkey.

4. Adjust the ow rate (using the up and down arrow keys) so the primary standard calibrator is 1.67 LPM

and then conrm by pressing the Save softkey.

NOTE: It should be noted that in order for the impactors to work properly the ow rate must be

adjusted to 1.67 LPM.

Connect AirProbe to the Back Housing

(two inlets located near the air ow outlet.

See air ow diagram on previous page.)

Air Velocity Measurement Screen

Session Run Time

Summary Session

Air Velocity

To view air velocity measurements, perform or verify the following:

1. The air velocity probe is enabled in Setup\AUX\Air Velocity screen.

2. Connect the air velocity probe and attachment to the EVM unit to the auxiliary Air probe inlet.

(See Air Probe inlets diagram in previous section, “Particulate Air Flow”.)

3. Turn Air Velocity Probe switch On.

4. Navigate to the Air Velocity measurement screen using keys.

Viewing Logged sessions (past sessions)

Once you have logged data and stopped the session, the data is stored under the past session summary

menu. (Optional: you can view the data in charts/graphs when downloaded to DMS.)

1. Navigate to Start \Past Session screen.

2. Select the File eld and press the File softkey. (Past Session\Load File screen will display all of the

logged les.) Press Enter key to change between dierent le views.

3. Select the appropriate le (by using up/down arrows) and press the Load softkey.

4. Press Detail softkey to view data.

5. Press keys to view summary data.

Repeat as necessary.

Manifold

Sensor Bar - Remove Screw 1 & 2 and Lift O Cover

CO2 Sensor

Toxic Sensor

PID Sensor

Screw 1

Screw 2

Thin-layer of

Silicone is applied

to a clean impactor.

Example of

accumulated dust

(will form into

a pyramid)

Maintenance/Cleaning

Sensors Locations

The gas sensors are inserted, factory calibrated, and ready for usage upon delivery. (The diagram below

is based on the EVM-7 model.) Occasionally, you may have to care for the sensors which will require

removing and inserting.

NOTE: Verify the unit is o and unplugged from the power cord before

removing or inserting sensors.

1. Remove the sensor bar (via the screws) and remove the manifold.

2. Sensor bar removal and location of sensors are displayed below. When removing/inserting, align the

socket pins to the circuit board accordingly.

Impactor Care and Particulates

The impactor requires periodic greasing and cleaning for particulate measuring only.

1. Remove the turret (red housing cover over the impactor) by removing the right and left screw with

the supplied allen wrench (stored behind

the access door.)

2. Remove all debris/dust with a Q-tip/cotton.

3. Wipe a very thin lm of silicone grease onto

the metal plates using a Q-tip/cotton.

4. Re-attach by placing the turret cover over

the housing and tighten screws.

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