JL3 Job Link System Flex Psychrometer Probe

The Fieldpiece JL3RH is a wireless flex psychrometer probe designed to measure dry bulb temperature, wet bulb temperature, relative humidity, dew point, and enthalpy in HVAC systems. This probe connects to the Job Link System app via Bluetooth, streaming live psychrometric data to your phone or compatible Fieldpiece gauges from up to 1000 feet line-of-sight. Built for HVAC professionals who need accurate airflow and system capacity diagnostics, the JL3RH features a slim, flexible wand that reaches into tight supply and return grilles where traditional probes cannot fit. The probe stabilizes quickly to deliver reliable wet-bulb and RH readings, helping technicians diagnose load calculations and system performance without guesswork.

• Flexible Wand Design: The probe's slim, flexible wand measures approximately 0.36 inches in diameter and 9.25 inches in length, allowing it to reach into narrow grilles and ductwork where rigid probes fail. This design reduces the need to remove registers or disassemble ductwork, saving you time on every service call.
• Comprehensive Psychrometric Measurements: Measures dry bulb, wet bulb, relative humidity, dew point, and enthalpy in a single sensor. These five readings give you a complete picture of air conditions for accurate load calculations and capacity verification.
• 1000-Foot Wireless Range: Bluetooth connectivity provides up to 1000 feet line-of-sight range to the Job Link app or compatible Fieldpiece manifolds. You can monitor attic or rooftop units from the ground floor or inside the home, eliminating trips between equipment and display.
• Fast Stabilization: The sensor responds quickly to changing conditions, delivering stable wet-bulb and RH readings faster than older psychrometer technologies. Faster stabilization means less wait time per measurement and more jobs completed per day.
• LED Status Indicator: An onboard LED provides visual confirmation of probe power and connection status. You know at a glance whether the probe is powered on and paired to your device.
• Long Battery Life: Powered by two AAA batteries (included), the probe runs for extended periods between battery changes. Replaceable batteries mean no downtime waiting for recharges in the field.
• A2L Refrigerant Ready: Designed to support workflows for A2L refrigerant systems, the JL3RH integrates seamlessly with modern HVAC diagnostics. As the industry transitions to new refrigerants, this probe keeps your toolkit current.
• Job Link System Integration: Streams data wirelessly to the Job Link app, where you can log readings, generate reports, and view psychrometric charts. Integration with the Job Link ecosystem turns raw measurements into actionable diagnostics and customer-ready documentation.

The JL3RH pairs via Bluetooth with the Job Link System app (compatible with iOS and Android devices) and Fieldpiece wireless manifolds including the SMAN series. The probe requires two AAA batteries for operation. Typical accuracy is plus or minus 1 degree Fahrenheit for dry bulb and plus or minus 2.5 percent RH under best-case conditions. For optimal wet-bulb readings, keep the protective slip cover moist during measurements.

No permanent installation is required. Insert the probe into supply or return grilles, ducts, or air handlers to take readings. To maintain wet-bulb accuracy, wet the protective slip cover with distilled water before each use and replace it when worn. Store the probe in a dry environment between uses and replace the AAA batteries when the LED indicator dims or the probe fails to pair.

• Job Link System Flex Psychrometer Probe (JL3RH)
• 1 Protective Slip Cover for Sensor Tip
• 2 AAA Batteries

A: A flex psychrometer probe measures multiple air properties (dry bulb temperature, wet bulb temperature, relative humidity, dew point, and enthalpy) to assess the moisture content and heat energy of air in HVAC systems. The Fieldpiece JL3RH uses a flexible wand to reach into supply and return grilles, streaming these measurements wirelessly to the Job Link app for system diagnostics and capacity calculations. These readings help technicians verify airflow, diagnose comfort issues, and confirm proper system operation.

A: To recalibrate the JL3RH sensor, place it in a controlled environment of 75 percent relative humidity at a temperature between 68 degrees Fahrenheit and 86 degrees Fahrenheit for 24 hours. You can create a 75 percent RH environment by adding wet salt to a clean open container such as a bottle cap, ensuring the solution does not touch the probe. This process resets the sensor's baseline for accurate humidity readings.