TRIPLETT RHT70 Hygro-Thermometer + IR Thermometer User Manual

TRIPLETT RHT70 Hygro-Thermometer + IR Thermometer User Manual

Introduction

Congratulations on your purchase of the Triplett RHT70 HygroThermometer plus InfraRed Thermometer. This device measures relative humidity, air temperature (with probe), and surface temperature (with the InfraRed function). The large, easy-to-read backlit LCD includes primary and secondary displays plus numerous status indicators. The InfraRed feature includes a laser pointer for convenient targeting.

Safety

Use extreme caution when the laser pointer beam is on

Do not point the beam toward anyone’s eye or allow the beam to strike the eye from a reflective surface

Do not use the laser near explosive gases or in other potentially explosive areas

Meter Description

1. Humidity/Air Temperature Probe
2. Probe input jack
3. Laser pointer
4. IR Sensor
5. Rubber holster
6. LCD Display
7. IR thermometer measurement button
8. IR and Relative Humidity function buttons (4)
9. Air Temperature function buttons (3)
10. Probe holder
11. Power ON/OFF button
12. Backlight button

Note: The battery compartment, tilt stand, tripod mount, and probe holder removal screw are located on the rear of the instrument

Display Description

• MAX (top of LCD): Max Hold function engaged for the Air Temperature function

• HOLD (top of LCD): Data Hold function engaged for the Air Temperature function

• PROBE TEMP: Reminder that the top LCD digits represent Air (Probe) Temperature

• : Indicates that the laser pointer is on.

• IR TEMP: Indicates that the larger LCD digits represent IR temperature measurement
  MAX (bottom of LCD): Max Hold for the IR Temperature and RH function

• HOLD (bottom of LCD): Data Hold for the IR Temperature function and RH function
  oC / oF: Temperature units of measure

• %RH: Relative Humidity unit of measure

• Large LCD digits at center of display for Relative Humidity and IR Temperature Smaller LCD digits at top, right of display for Probe Temperature

• : Low battery indicator

Operation

Power

Press the button to turn power on or off.

Probe Humidity and Temperature Measurements

1. Attach the probe to the meter via the jack at the top of the meter.
2. Hold the probe in the area to be tested & allow adequate time for readings to stabilize.
3. Read the Relative Humidity (center of LCD) and Probe

Temperature (top of LCD).
NOTE: Do not immerse the probe in liquid; it is intended for use in air only.

InfraRed (Non-Contact) Temperature Measurements

1. The IR sensor is located at the top of the meter.
2. Point the sensor toward the surface to be measured.
3. Press and hold the large red IR button to begin measuring the surface temperature of a desired target. IR TEMP and will appear on the display. The laser pointer will switch on to help aim the meter.
4. The measured IR surface temperature will appear at the center of the LCD (larger digits). The temperature displayed is the temperature of the area within the spot.
5. When the red IR button is released, the laser pointer will switch off and the reading will freeze (data hold) on the display for approx 10 seconds.
6. Note that the probe (Air Temperature wand) continues to monitor temperature during IR tests and its temperature is displayed on the top of the LCD (smaller digits).
7. After approx. 10 secs. the meter defaults to the Humidity and Air Temperature display.

Automatic Power OFF

To conserve battery life the meter automatically shuts off after 10 minutes.

oF/oC buttons

The Air Temperature and the IR Temperature units can be selected by the user. For Air Temperature, press the oF/oC button on the bottom left. For the IR temperature units, press the oF/oC button at the center of the meter.

Data Hold Buttons

Displays can be held (frozen) at any time by pressing the HOLD button.

For Air Temperature, use the HOLD button on the bottom right. For IR Temperature and for Relative Humidity, use the HOLD button on the right center of the meter. Press HOLD again to exit the mode. Note that in IR temperature mode Data Hold is automatically engaged when the red IR button is released.

MAX Buttons

Press the MAX button (bottom of meter for Air Temperature; center of meter for IR temperature and Relative Humidity) to display only the highest reading. The displayed measurement will now only change when a higher reading is detected. Press the MAX button again to exit this mode.

Backlight Press the backlight button to turn the light on. Press again to turn it off.

The polarization index Test calculates the ratio of the resistance measurement after 10 minutes to the resistance measurement after 1 minute: Results are determined by the type, age and condition of the insulation material tested. Established standards and test procedures should be used to establish pass/fail criteria for each application.

InfraRed Measurement Considerations

When taking IR measurements the meter automatically compensates for ambient temperature changes. Note that it may take up to 30 minutes to adjust to extremely wide ambient changes.

Low temperature measurements quickly followed by high temperature measurements may require several minutes to stabilize as a result of the IR sensor cooling process.

If the surface of the object under test is covered with frost, oil, grime, etc., clean before taking measurements.

If an object’s surface is highly reflective apply masking tape or flat black paint before measuring. Steam, dust, smoke, etc. can obstruct measurements.

To find a hot spot, aim the meter outside the area of interest then scan across (in an up and down motion) until the hot spot is located.

IR Theory

IR thermometers measure the surface temperature of an object. The meter’s optics sense emitted, reflected, & transmitted energy that is collected and focused onto the meter’s detector. The meter’s circuitry translates this information into an LCD reading.

IR Field of View

Ensure that the desired target is larger than the spot size as shown in the diagram below. As the distance from an object increases, the spot size of the area measured by the meter becomes larger. The meter’s field of view ratio is 8:1, meaning that if the meter is 8 inches from the target, the diameter (spot) of the object under test must be at least 1 inch. Other distances are shown below in the field of view diagram.

Maintenance

Cleaning and storage

1. The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives.
2. Store the meter in an area with moderate temperature and humidity

Battery Replacement

The battery symbol appears on the lower right of the LCD when the 9V battery needs to be replaced.

Replace the 9V battery as follows:

1. Turn the meter off and disconnect the air temperature probe.
2. Remove the large flat-head screw on the rear of the meter to remove the probe holder.
3. Remove the rubber holster that surrounds the entire meter by pulling it over the top of the meter.
4. Remove the small Phillips head screw on the rear of the meter.
5. Open the battery compartment and replace the 9V battery.
6. Re-assemble the meter before operating.

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.

Other Battery Safety Reminders

• Never dispose of batteries in a fire. Batteries may explode or leak.
• Never mix battery types. Always install new batteries of the same type.

WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place and fastened securely.

NOTE:: If your meter does not work properly, check the fuses and batteries to make sure that they are still good and that they are properly inserted.

Calibration

A humidity calibration adjustment is located in the battery compartment.

1. Remove the battery door and move the battery to one side.
2. Place the humidity probe in a humidity chamber or humidity calibration bottle and wait 20 minutes
3. Turn the meter on and turn the adjustment until the humidity reading on the display agrees with the calibration source.

Specifications

IR

Temperature

| -50.0 to -20.0oC (-58.0 to – 4.0oF)| ± 5oC (± 9oF)
-20.0 to 93.3oC (-4.0 to 199.9oF)| ± 2% of rdg or ± 2oC (± 4oF)
93oC to 204oC (200 to 400oF)
204oC to 500oC (400 to 932oF)| ± 3% of rdg

• Display
  Dual LCD with Backlight and status indicators

• Sensor Type
  Humidity: Precision capacitance sensor
  Temperature: Thermistor (probe) and InfraRed

• Response
  Time IR Temperature: 0.5 seconds; Probe Temperature and Relative
  Humidity: 3 minutes

• Accuracy note
  Accuracy is specified for the following ambient temperature range: 18 to 28°C (64 to 82°F)

• Sampling
  Rate 2.5 samples per second

• InfraRed
  Emissivity 0.95 (fixed)

• IR Field of
  View D/S = Approx. 8:1 ratio (D = distance, S = spot)

• Laser power
  Less than 1mW

• IR Spectral
  Response 6 to 14 m (wavelength)

• Operating
  Conditions 0 to 50oC (32 to 122oF); < 80% RH non-condensing

• Storage
  Conditions -10 to 60oC (14 to 140oF); <80% RH non-condensing

• Power Supply
  9V Battery with auto power off (after 10 minutes)

• Battery Life
  Approx. 24 hours (if Backlight and Laser are used continuously the battery life is reduced to 2 to 3 hours approx.)

• Dimensions / Weight
  150 x 72 x 35mm (5.9 x 2.8 x 1.4”); 235g (8.3 oz)

Emissivity

Most organic materials and painted or oxidized surfaces have an emissivity of 0.95 (fixed setting in the model RHT70). Inaccurate readings will result when measuring shiny or polished surfaces. To compensate, cover the surface under test with masking tape or flat black paint. Allow time for the tape to reach the same temperature as the material underneath then measure the temperature of the tape or the painted surface.

Warranty

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.triplett.com

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