06
07
08
09
10
Operation
Press for 1 second to power ON/OFF.
LED Color Indications
Green slow blink: normal operation
Red slow blink: batteries need to be replaced
Supply or Return Side Switch
The Job Link™ app knows which side you
have selected for each probe. Select
Supply
air or
Return
air and place it on the system
appropriately.
Magnetic Hanger
You can slide the magnet to where you need
it. Slide it to the top and reach high grilles/
registers.
The magnet also holds the psychrometer in
place when testing in duct air. Just bend the
probe and slide into a 3/8" (10mm) hole in the
duct.
Remote Data Logging
(Data logging will be available shortly after
time of printing. Look for Job Link™ app updates.)
Use the Job Link™ app to program the JL3RH
to log measurements starting at a specific time
of day for up to 7 days. Auto power off disables.
1 Make sure JL3RH is powered OFF.
2 Open the Job Link™ app.
3 Press for 5 seconds to enter data logging
mode. The LED will shine solid green.
4 Set up the probe's data logging parameters
within the app. The LED will blink green while
the app is sending setup instructions. The
LED will slow blink blue when waiting for
programmed start time to occur.
5 Place the JL3RH on the system.
6 When the programmed start time is reached,
the LED will very slowly blink green to indicate
data logging has begun.
7 When the programmed span has finished, the
LED blinks and powers OFF.
8 Repeat steps 1-3 and use the Job Link™ app
to extract your data log from the JL3RH.
Auto Power Off (APO)
The probe will automatically power off after
2 hours. To disable APO until powered off, while
power is on tap twice. The LED will briefly
blink red. To enable APO, while power is on tap
twice. The LED will briefly shine red.
Maintenance
CLEANING:
Clean the exterior with a damp
cloth. Do not use detergents or solvents. Do not
touch the sensor.
BATTERIES:
When the LED slow blinks Red,
the batteries must be replaced. Ensure the
power is OFF. Remove the single screw from the
yellow battery cover. Install 2 x AAA batteries.
Monitor battery life in the app's tool manager.
SENSOR CARE:
Cover the sensor with the
slip cover when not in use. Extreme condi-
tions or exposure to solvent vapor may offset
the RH sensor. To re-calibrate, place the sensor
in a controlled environment of 75%RH and
between 68°F - 86°F for a period of 24 hours. To
create a 75%RH environment, add wet salt to a
clean open container (bottle cap). Be careful to
not let the solution touch the probe. Place this
container and the probe in a large sealed bag
at room temperature, undisturbed for 24 hours.
Specifications
Minimum Device Requirement:
BLE 4.0 devices running iOS® 7.0 or Android
TM
5.0
(Latest compatibility at www.fieldpiece.com)
Battery Type:
2 x AAA, NEDA 24A, IEC LR03
Battery Life:
150 hours typical alkaline. LED blinks red when bat-
tery replacement is needed.
Auto Power Off:
2 hours (APO can be disabled)
Wireless Range:
350 feet (107 meters) line of sight.
Obstructions affect distance.
Radio Frequency:
2.4 GHz
Operating Environment:
32°F to 122°F (0°C to 50°C) at <75% RH
Storage Temperature:
-4°F to 140°F (-20°C to 60°C), 0 to 80% RH
(with batteries removed)
Temperature Coefficient:
0.1 x (specified accuracy) per 0.6°F
(32°F to 64°F, 82°F to 122°F), per 1°C (0°C to 18°C, 28°C to 50°C)
Weight:
0.33 lbs (150 g)
Flexible Probe:
0.36" (9mm) diameter; 9.25" (235mm) length
Relative Humidity (%RH)
Sensor Type:
Capacitance polymer film
Hysteresis:
±1%RH typical (Excursion of 10% to 90% to 10%RH)
Measurement Range:
0%RH to 100%RH
Accuracy:
(At 73.4°F (23°C))
±2.5% (10%RH to 90%RH); ±(5%) <10%RH, >90%RH
Response Time:
60 seconds typical for 90% of total range
Temperature
Sensor Type:
Precision thermistor
Measurement Range:
-4°F to 140°F (-20°C to 60°C)
Accuracy:
±(1°F) 32°F to 113°F, ±(0.5°C) 0°C to 45°C;
±(2°F) -4°F to 32°F, 113°F to 140°F, ±(1°C) -20°C to 0°C, 45°C to 60°C
Return Air
(Warm Air)
(Red)
Supply Air
(Cool Air)
(Blue)
