User Manual
LT65 Digital Light Meter

Introduction

Congratulations on your purchase of the Triplett LT65 Digital Light Meter. The LT65 Digital Light meter is designed for Light intensity measurement projects, quality control, health control and measuring Light intensity of various kind of environments, like factories, parking lots, schools, offices, transportation lines, schools and many other environments.

Safety

• Do not operate the meter in environments where the following are present: explosive gases (or materials), combustible gases (or materials), steam, or dust.
• Please replace the battery immediately when the low battery symbol appears on the LCD.
• Do not touch the meter’s circuit board for any reason; static electricity or contamination could damage the sensitive components.
• This instrument was designed for pollution degree 2. Operation Altitude: Up to 2000m (7000′).

Description

1. LCD Display
2. Function Buttons
3. Light Sensor

Display Overview

• MAX – Maximum display symbol.
• MIN – Minimum display symbol.
• Low battery symbol, which shows the power is low battery. Please change a new battery.
• HOLD – Data hold symbol
• TIME – Time display, format: hour : minute
• Function Buttons
• TIME Long press the button “TIME” for 2 seconds to enter the time setting page. Short press the button “TIME” to select the value of “hour” and “minutes” to be set. Press the button “HOLD” to change the value. Long press the button to exit the time setting.
• Maximum, Minimum function option, pressing this button for 3 seconds exits this function., RECLux/FcLEVEL’ also will also exit this function.
• Displsy HOLD , LCD will show HOLD symbol.
• Range selection function. Range selection function will disable under the “REC” function. Choose measurement range before enter “REC” function.
• Backlight Function
• Changes UNITS Fc/Lux
• 1FC=10.76Lux,1KLux=1000Lux,1KFC=1000FC
• Power ON / OFF Button
• To Power ON ­ Press and Hold this button for more than 1 second until LCD screen full of display.
• To Power OFF ­ Press and Hold this button for more than 3 seconds until LCD screen have no any display.

Operation

1. POWER ON: Press the POWER button for more than 1 second until LCD displays..
2. POWER OFF: Press the POWER button for more than 3 seconds until LCD extinguishes.
3. Choose Lux or FC unit Transfer measurement range switch can exchange Lux or FC unit.
4. Transfer light probe cover and make it vertical to aligned light source.
5. Read the measurement data from LCD screen.
6. Over range: If the instrument only display”OL”, means the signal input is too strong, should choose a higher range. Measurement range will display below the LCD screen. LUX :400 -> 4K -> 40k -> 400k; FC: 40 -> 400-> 4k -> 40k.
7. Data holding function: Press HOLD button and choose data holding function.
8. Maximum and minimum function: Press MAX/MIN button choose the maximum reading and minimum reading function. Press MAX/ MIN or LEVELLUX/FCREC for 3 seconds exit this function.
9. USB function: connect with the computer’s USB interface.
10. Backlight function: Press Backlight button to start up the function, press it again to exit the function.
11. When all measurement are done, please restore the light probe cover and turn off the instrument.

Battery Replacement

When appears on the LCD, the 3*1.5V AA battery must be replaced.

1. Disconnect the sensor.
2. Remove the meter’s rubber protective jacket
3. Use a Phillips screwdriver to open the rear battery compartment
4. Replace the 3*1.5V AA battery
5. Close the battery compartment and replace the meter’s protective jacket

Warranty Information

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 © 2020 Triplett

Specifications

Display 4 Digit LCD Display
Measurement
Range 0 to 400,000 Lux; 0 to 40,000 Fc 1 Fc = 10.76 Lux; 1kLux = 1000 Lux; 1k Fc
Notices = 1000 Fc
Overload Display LCD displays “OL”
Spectral Response Spectral Precision
CIE Appropriate Light (CIE eye response curve)
CIE VV function f1’% less than or equal to 6%
Cosine Response f2′ less than or equal to 2% Precision ±3% reading ±0.5%FS (<10,000 Lux) ±4% reading ±10d (>10,000 Lux)
Silicon light diode and a spectral
Light probe
response filter
Power (3) 1.5V batteries
Light Probe
Length 59” (150cm)
Light Probe
Volume 4.5” x 2.4” x 0.8”( 115 x 60 x 20mm) Dimensions 6.4” x 2.4 x 1.2”(162 x 62 x 30mm) Weight 9.2 oz (260g)
Accessories Canvas bag, User Manual, Batteries,

User Manual

Introduction

Congratulations on your purchase of the Triplett CFM100 ThermoAnemometer. The CFM/CMM Thermo Anemometer instrument measures Air Velocity, Air Flow (volume) and Temperature. The large, easy-to-read backlit LCD includes primary and secondary displays plus numerous status indicators.

Safety

• Do not operate the meter in environments where the following are present: explosive gases (or materials), combustible gases (or materials), steam, or dust.
• Please replace the battery immediately when the low battery symbol appears on the LCD.
• Do not touch the meter’s circuit board for any reason; static electricity or contamination could damage the sensitive components.
• This instrument was designed for pollution degree 2. Operation Altitude: Up to 2000m (7000′).

Description

1. Vane Anemometer (Sensor) Input Connector
2. Vane Anemometer Sensor
3. Right Side Function Buttons (°C/F, UNITS, HOLD)
4. Left Side Function Buttons (Backlight, MAX/MIN, AREA)
5. LCD Display

Display Overview

• VEL: indicates that meter is in air velocity mode
• FLOW: indicates that meter is in air flow mode
• MAX (bottom of LCD): Max Hold for the Air Velocity and Air Flow function
• HOLD (bottom of LCD): Data Hold for the Air Velocity and Air Flow function
• oC / oF: Temperature units of measure
• CFM/CMM: airflow units of measure
• AREA(ft2, m2): units for area dimensions
• m/s, ft/min, km/h, MPH, knots: air velocity units of measure
• X10, X100: multipliers for air flow readings
• AVG: air averaging mode
• REC: indicates that min/max function is running (top for temp, bottom for air)
• Large LCD digits at bottom of display for Air Velocity and Air Flow
• Smaller LCD digits at top, right of display for Probe Temperature
•  :Low battery indicator

Operation

Connecting the Vane
1. The vane plug is inserted in the meter’s sensor jack at the top of the meter. The plug and jack are keyed so that the plug can only fit in the jack one way.
2. Turn the plug carefully until it lines up with the jack and then firmly push the plug in place. Do not apply undue force or try to twist the plug side-toside.
3. If the vane is not connected to the meter or if the sensor is defective, the LCD display will indicate OL in place of a Temperature reading.

Air Velocity Measurements (Single Point)
1. Turn on the meter using the ON/OFF button.
2. Press UNITS button to select the desired unit of measure. NOTE: At power up the meter will display the last unit of measure previously entered.
3. Place the sensor in the air stream. Ensure that the air enters the vane as indicated by the arrow sticker placed inside the vane.
4. View the readings on the LCD Display. The large main LCD display shows the Air Velocity reading. The upper right LCD sub-display shows the temperature reading.

Side view of Vane Arrow airflow

Air Flow Measurements (CMM / CFM)

1. Turn on the meter using the ON/OFF button
2. Press the UNITS button to select the desired air flow units: CMM (cubic meters per minute) or CFM (cubic feet per minute). NOTE: At power up the meter will display the last unit of measure previously entered.
3. To begin entering the area in m2 or ft2, press and hold the AREA button until it beeps twice. The leftmost digit of the bottom display will begin to flash.

4. Place the sensor in the air stream. Ensure that the air enters the vane as indicated by the arrow sticker placed inside the vane. Refer to the diagram. The large main LCD display shows the Air Velocity reading. The upper right LCD sub-display shows the temperature reading.

The meter has 2 memory locations (1 for CFM and 1 for CMM) that can be used to store commonly used area sizes that you can recall at anytime.

1. Press the AREA button until meter beeps twice. A memory location number will appear in the top right of the display indicating the memory location.
2. Use the UNITS button to change the flashing digit
   Use the MAX/MIN button to move the decimal
   After all of the digits are entered, press and hold the AREA button (until it beeps twice) to save the area into memory and return to CFM or CMM measuring mode.

Data Hold (Air Velocity/Air Flow)

1. While taking measurements, press the HOLD button to freeze the air velocity/air flow reading.
2. The HOLD indicator will appear in the bottom of the LCD display.
3. Press HOLD again to return to normal operation.

MAX/MIN/AVG Record (Air Velocity/Air Flow) This allows the user to record and view the highest (MAX), lowest (MIN) and average (AVG) readings.

1. Press the button MAX/MIN button. The MAX indicator and RECORD indicator along with the Max reading will appear on the LCD display and the meter will begin keeping track of the MAX, MIN and Average values.
2. Press the MAX/MIN button again to view the minimum reading. The MIN indicator along with the minimum reading will appear on the LCD display.
3. Press the MAX/MIN button again to view the average reading. The AVG indicator along with the average reading will appear on the LCD display.
   NOTE: Average recording will stop automatically after 2 hours, and the upper LCD sub-display will show an OFF (only in the average mode).
4. Press the MAX/MIN button again to display current readings. NOTE: the meter will keep recording MAX/MIN/AVG readings.
5. To clear and stop MAX/MIN/AVG recording and return to normal operation, press and hold the MAX/MIN button until the meter beeps twice.

Automatic Power OFF

To conserve battery life, the meter automatically turns off after 18 minutes. To defeat this feature:

1. Turn the meter OFF.
2. Press and hold the (Backlight) key while turning the meter ON.
3. “dis APO” will appear in the display. The AUTO POWER OFF feature will now be disabled.
4. Note that AUTO POWER OFF is re-enabled each time the meter is turned on.
5. Also note that AUTO POWER OFF is disabled in CFM/CMM or Average mode.

Battery Replacement

When appears on the LCD, the 3*1.5V AA battery must be replaced.
1. Disconnect the sensor.
2. Remove the meter’s rubber protective jacket
3. Use a Phillips screwdriver to open the rear battery compartment
4. Replace the 3*1.5V AA battery
5. Close the battery compartment and replace the meter’s protective jacket

Specifications

General Specifications

Useful Equations and Conversions

Area equation for rectangular or square ducts

Height (H) Width (W) Area (A) = Width (W) x Height (H)
Area equation for circular ducts

Radius
Area (A) = x r2 Where = 3.14 and r2 = radius x
radius

Cubic equations
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
NOTE: Measurements made in inches must be converted to feet or meters before using the above formulae.

Unit of Measure Conversion Table

Warranty Information

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 © 2020 Triplett