Flir Extech RH390 User's Guide

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Year 2013

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Flir Extech RH390 Meter Specification

The Flir Extech RH390 is a precision hygrometer designed to measure relative humidity, temperature, dew point, and wet bulb temperature with high accuracy. This device is particularly suitable for HVAC professionals, facility maintenance, and research applications where precise environmental monitoring is crucial. The RH390 features a wide humidity range from 0 to 100% RH and a temperature range from -30°C to 100°C, making it versatile for various environments. It ensures accuracy with a ±2% RH and ±0.5°C temperature precision, facilitated by its advanced sensor technology.

The meter is equipped with a large, backlit LCD display that clearly presents readings, even in low-light conditions. It offers a data hold function to freeze readings on the display and has a min/max feature to capture extremes over a period. The RH390 includes an auto power-off function to conserve battery life, enhancing field usability. Powered by a standard 9V battery, it provides extended operational endurance, crucial for prolonged tasks.

Constructed with a robust housing, the RH390 is durable enough for fieldwork, withstanding moderate physical impacts and environmental stressors. It supports data logging capabilities, allowing users to record and analyze environmental conditions over time, enhancing its utility in detailed assessments and reporting. The device comes with a USB interface for easy data transfer to a computer for further analysis. The Flir Extech RH390 is a comprehensive tool for professionals requiring reliable, precise, and versatile environmental measurements, combining advanced features with user-friendly operation.

Flir Extech RH390 Meter F.A.Q.

How do I calibrate the Flir Extech RH390 Meter?

To calibrate the Flir Extech RH390, use a standard known humidity source. Follow the user manual's calibration section by accessing the calibration mode and adjusting the readings to match the known source.

What is the best way to clean the RH390 sensor?

To clean the RH390 sensor, gently wipe the sensor with a soft, lint-free cloth slightly dampened with distilled water. Avoid using any chemical solvents or submerging the sensor in liquid.

How can I replace the battery in the RH390?

To replace the battery, turn off the meter, open the battery compartment at the back, remove the old batteries, and insert new ones ensuring correct polarity. Use only the recommended battery type.

What should I do if the RH390 displays erratic readings?

If the RH390 displays erratic readings, check for low battery and replace it if needed. Ensure the sensor is clean and not obstructed. If the problem persists, perform a calibration.

Can the RH390 measure both humidity and temperature simultaneously?

Yes, the RH390 is capable of measuring both humidity and temperature simultaneously and displaying them on the screen.

How do I switch between units of measurement on the RH390?

To switch between units of measurement, press the unit button on the RH390 until the desired unit is displayed. Options typically include Celsius, Fahrenheit, and relative humidity percentages.

What is the response time for the RH390 sensor?

The typical response time for the RH390 sensor is around 30 seconds for humidity and temperature stabilization.

How can I store data from the RH390?

The RH390 does not have data logging capabilities. For data storage, manually record readings or connect it to an external data logging system if compatible.

What should I do if the display on the RH390 is blank?

If the RH390 display is blank, check if the device is powered on and the battery is properly installed. Replace the battery if necessary. If the issue persists, consult the user manual for further troubleshooting steps.

How often should I calibrate the RH390 for optimal performance?

It's recommended to calibrate the RH390 at least once a year or whenever you notice discrepancies in readings compared to a known reference. Frequent calibration ensures accuracy.