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User Manual
EM300
10-in-1 Environmental Meter w/Airflow
Introduction
Thank you for selecting the Triplett EM300 Environmental Meter. This
instrument measures Air Velocity with Air temperature, Air Flow (volume),
Light, Relative Humidity % with Air temperature, Dew Point temperature,
Web bulb temperature, Type K temperature (external probe), Heat Index
temperature, and Wind Chill temperature. The backlit LCD includes
primary and secondary displays plus a variety of intuitive status indicators
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Features
• Professional environmental meter with programming menu for usercustomization
• Selectable units of measure
• Air velocity with air temperature readings
• Air Flow (Volume) measurements in CFM (ft³) and CMM (m³) units
• Light measurements in Foot candle and LUX units
• Environmental measurements: Relative humidity % with air
temperature, Dew point temperature, Wet bulb temperature, Wind
chill temperature, Heat Index temperature, and Type K temperature
(with external probe connected)
• Low-friction ball bearing mounted vane wheel for high
accuracy low air velocity measurements
• Built-in barometric sensor for precise atmosphere and altitude
monitoring
• MAX-MIN Recording
• Display Hold freezes displayed reading for convenience
• Compact, light-weight, easy-to-use, ergonomic design with lanyard
• Backlit LCD automatically reverses orientation to match selected sensor
mode
Description
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METER DESCRIPTION
1. Air Velocity Vane
2. Type K Thermocouple Input
3. LCD Display
4. Display Hold / Mode Button
5. Light Sensor
6. Humidity/Temperature sensors
7. Power/Backlight button
8. MAX-MIN Record/Enter Button
LCD Description
1. MAX/MIN Record icon
2. MAX Display
3. MIN Display
4. Display Hold
5. Primary Display
6. Units of Measure
7. Temperature Display
8. Reverse Orientation Display
9. Units of Measure (for reverse display)
Operation
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Meter Power
1. Three (3) 1.5V ‘AAA’ batteries power the meter. The battery
compartment is located on the rear of the meter secured by one
flat head screw.
2. Short press the power button to switch the meter ON. The
meter will begin displaying readings for the mode selected.
3. Long press the power button to power OFF the meter.
Auto Power OFF (APO)
In order to conserve battery life, the meter will automatically switch
off after approximately 10 minutes of inactivity. Note that APO does
not function while the meter is in the MAX -MIN Recording mode
(short press the R button to access the MAX-MIN Recording mode).
Selecting the Operating Mode
Long press the M (Mode) button to scroll through the list of functions.
When the desired mode is displayed, release the button. See display
icons with brief descriptions below:
• AnAnemometer (Air Velocity plus Air temperature)
• AirFLAir flow (Volume) in CFM and CMM units
• CHiLLWind chill temperature
• rHRelative Humidity in % and Air temperature
• dPDew point temperature
• _EtWet bulb temperature
• HEAtHeat index temperature
• LigHtLight intensity measurements
• tYPEType K thermocouple temperature (must attach thermocouple
to meter)
Changing the Units of Measure
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Press and hold the R button until the word ‘Unit’ appears.
Now short press the power button to change the units for the
selected measurement mode.
Short press to save the selection and move to the
secondary function, if applicable (temperature, for example).
Short press the power button to change the secondary function
units, if applicable, and then short press to save.
See units list below:
o Air Velocity units M/S, km/h, mph, knot, FPM
o Air Flow units CFM (ft3) and CMM (m3)
o Temperature units °C and °F (for air, wind chill, dew
point, wet bulb, heat index, and Type K)
o Light units Foot-candles (Ft-cd), LUX
Reversible Backlight LCD
The LCD display automatically reverses its presentation
orientation depending on measurement mode. This is to match the
display orientation with the selected sensor mode (light, air
velocity, or environmental measurements such as Wet bulb
temperature).
The LCD is equipped with backlighting for easier viewing,
especially in dimly lit areas. With the meter powered ON, short
press the power button to turn ON the backlight. The backlight will
power OFF after several seconds.
Display Hold
Short press the H (Hold) button to freeze and unfreeze the displayed
reading. The Display Hold mode is not operational when using the MAXMIN Recording mode.
MAX-MIN Record Mode
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In this mode, the meter records the maximum and minimum readings
over time.
Short press the R (Record) button to start recording MAX/MIN
readings.
Now use short presses of the R button to toggle MAX and MIN reading
displays.
Short press the H button to reset MAX and MIN memories.
Press and hold the R button to exit the Recording mode.
Measurement Modes
Air Velocity with Air temperature
With the meter ON, press and hold the M (Mode) button until ‘An’ is
displayed; then release the button.
Hold the measurement vane in the air stream (in either direction).
View the air velocity and air temperature readings on the LCD.
Light Measurements
Press and hold the M button until ‘LigHt’ is displayed; then release.
Hold the meter so that the source of light fully encompasses the light
sensor dome.
View the light reading on the LCD (light readings are displayed in
reverse orientation).
Type K/Wind chill/Relative Humidity/Dew
point/Wet bulb/Heat index Measurements
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Press and hold the M button until the desired function is displayed:
CHiLL Wind chill; rH Relative Humidity (with air temperature); dP Dew
point; _Et Wet bulb; HEAt Heat index; tYPE Type K thermocouple
temperature (attach thermocouple to meter)
Place the meter or type K probe in the measurement area and view the
readings on the LCD.
Air Flow (CFM, CMM) Volume Measurements
• Press and hold the M button until ‘AirFl’ appears.
• Enter the duct area (in square feet or meters) by short pressing M
and long pressing R until ‘m-2’ (m2) or ‘f-2’ (ft2) appears. Short
press the power button to increase or H to decrease the area; Long
press the power or H button to scroll quickly. See area equations
below.
• Short press to save.
• Remember to convert inches, centimeters, or other unit to square
feet or square meters before entering the area; otherwise, the air
flow readings will not be correct.
• Place the vane in the air duct and read the air flow reading in CFM (ft³)
or CMM (m³) units on the LCD.
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Area equation for rectangular or square ducts
Height (H)
Width (W)
Area (A) = Width (W) x Height
(H)
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Maintenance
Battery Replacement
When the low battery icon appears on the display please replace
the batteries as described below.
1. Remove power from the meter.
2. Remove the flat head screw that secures the battery
compartment at the back of the meter.
3. Open the battery compartment and replace the three (3) 1.5V
‘AAA’ batteries observing correct polarity. Re-assemble the
meter before use.
Safety: Please dispose of batteries responsibly; never dispose of batteries
in a fire, batteries may explode or leak. If the meter is not to be used for
60 days or more, remove the batteries and store separately.
Cleaning and Storage
Periodically wipe the case with a damp cloth and mild
detergent; do not use abrasives or solvents. Do not allow
moisture to come in contact with any of the sensors.
Never dispose of used batteries or rechargeable batteries in
household waste.
As consumers, users are legally required to take used
batteries to appropriate
collection sites, the retail store where the batteries were
purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household
waste. The user is obligated to take end-of-life devices to a
designated collection point for the disposal of electrical and
electronic equipment.
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Specifications
Display
Backlit LCD 3.0 x 3.5 cm (1.18 x 1.38”)
Air Velocity
Sensor
Low friction ball bearing
vane
Light sensor
Cosine/color-corrected photo-diode
Air Temperature
sensor
PT1K ohm RTD (internal
sensor)
Relative Humidity
sensor
Capacitance sensor
Measurements
Air Velocity with Air Temperature, Relative Humidity
with Air
Temperature, Light, Air Flow, Dew Point, Wet Bulb,
Wind Chill, Heat
Index, and Type K Temperature (requires external
thermocouple)
Tripod mount
On rear of meter
Operating
Humidity
80% RH Max
Operating
Temperature
0 to 50°C (32 to 122°F)
Over Limit
Display
“----“
Power Supply
3 x 1.5V AAA batteries
Power
Consumption
Approximately 5mA DC
Weight
145g (5.1oz)
Dimensions (HxWxD)
153x 58x 25mm (6.0 x 2.3 x 1.0 inch)
Air Velocity plus Air Temperature
General
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Units
Range Resolution
Accuracy
ft/min (FPM)
80 to
3937 1
m/s
0.4 to
20.0 0.1
±3% F.S.
km/h
1.4 to
72.0 0.1
MPH
0.9 to
44.7 0.1
knots
0.8 to
38.8 0.1
°C 0 to 50
0.1°
±1.2°C
°F
32 to
122 0.1°
±2.5°F
%RH
10 to 95
0.1
±(4%RH) @ < 70%RH
±(4%rdg +1.2%RH) @ >
70%RH
°C
0 to 50
0.1
±1.2°C
°F
32 to 122
0.1
±2.5°F
Light (automatic ranging)
Lux
0 to 2,200
1
1,800 to 20,000
10
±(5%rdg + 8dgts)
Ft-cd
0 to 204.0
0.1
170 to 1,860
1
Ft/min and FPM: feet per minute MPH: miles per hour
m/s: meters per second knots: nautical miles per hour
km/h: kilometers per hour
Relative Humidity plus Air Temperature
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Air Flow
CMM (m3)
0.024 to 36000
0.001 / 0.01 / 0.1 / 1
CFM (ft3)
0.847 to 1271300
0.001 / 0.01 / 0.1 / 1 / 10(x10) / 100(x100)
Dew Point Temperature
Unit
Range
Resolution
Accuracy
°C
-25.3 to 49.0
0.1
Calculated from
temperature and
°F
-13.5 to 120.0
0.1
humidity readings
Wet Bulb Temperature
°C
-5.4 to 49.0
0.1
Calculated from
temperature and
°F
22.2 to 120
0.1
humidity readings
Heat Index
°C
0 to 100.0
0.1
±2.0°C
°F
32 to 212
0.1
±3.6°F
Exposure to direct sunlight can increase heat index readings by 8oC (14oF)
Type K Thermometer
°C
-50.0 to 1300.0
0.1
±(0.4% + 0.5°C)
-50.1 to -100.0
±(0.4% + 1°C)
°F
-58.0 to 2372.0
0.1
±(0.4% + 1°F)
-58.1 to -148.0
±(0.4% + 1.8°F)
°C
-9.4 to 44.2
0.1°
±2.0
°C
°F
15.0 to 112.0
0.1°
±3.6
°F
Accuracy is stated for meter only. Additional error is introduced by the external
Type K probe
Wind chill value is displayed only when the temperature is < 15oC (59oF) and air
velocity is > 1.4 m/s
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Unit of Measure Conversion Table
m/s
ft/min
knots
km/h
MPH
1 m/s 1 196.87
1.944
3.6
2.24
1 ft/min
0.00508
1
0.00987
0.01829
0.01138
1 knot
0.5144
101.27
1
1.8519
1.1523
1 km/h
0.2778
54.69
0.54 1 0.6222
1 MPH
0.4464
87.89
0.8679
1.6071
1
Triplett / Jewell Instruments extends the following warranty to the original purchaser of
these goods for use. Triplett warrants to the original purchaser for use that the products
sold by it will be free from defects in workmanship and material for a period of (1) one
year from the date of purchase. This warranty does not apply to any of our products
which have been repaired or altered by unauthorized persons in any way or purchased
from unauthorized distributors so as, in our sole judgment, to injure their stability or
reliability, or which have been subject to misuse, abuse, misapplication, negligence,
accident or which have had the serial numbers altered, defaced, or removed.
Accessories, including batteries are not covered by this warranty
Copyright © 2021 Triplett
www.triplet
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