Chapter 4: Calibrate Sensors; Placement And Calibration Of Sensors; Inserting And Removing Sensors - 3M EVM Series User Manual

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Placement and calibration of sensors

Inserting and removing sensors

Calibrate sensors
Placement and calibration of sensors
Before you begin your measurement sampling, it is recommended to
calibrate the sensors you will be using. This chapter focuses on
inserting and removing sensors, calibrating each sensor, viewing past
calibrations, and how to verify your calibration set points. (Please
reference the following sections which apply to your installed sensor
components.)
Calibrating sensors include
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Inserting and removing sensors
The sensors you purchased with your EVM will be inserted, factory
calibrated, and ready for usage. To understand how to insert or
replace a sensor this is discussed in the procedures below.
Inserting sensors
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1. Ensure the instrument is turned of and the external power cord is
disconnected. Next, remove the sensor bar by unscrewing two
screws from the top compartment with a screw driver.
2. Lift the cover off and set aside. (The location of the sensors is
indicated in Figure 4-2.)
Particulate sensor (starting on page 49 )
Pump flow rate calibration (starting on page 58)
CO and O sensor (starting on page 67)
2 2
Toxic sensors (starting on page 63)
Photo-Ionization Detector (PID) sensor (for VOCs) (starting on
page 71)
Temperature (temp) and Relative humidity (RH) sensors
(starting on page 74)
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CHAPTER
4