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RTR-503 Wireless External Sensor Temperature and Humidity Recorder - Tech Instrumentation

RTR-503 Wireless External Sensor Temperature and Humidity Recorder

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  • $249.00

Our RTR-503 Data Loggers

are equipped with built-in wireless communication capability. They are compact and durable data loggers featuring waterproof and dust-proof construction.

RTR-503 / 507: External Temperature and Humidity Sensor

While both models come with a sensor for temperature and humidity measurement, a high precision temperature/humidity sensor for RTR-507 extends the measurement range and accuracy. The body is splash proof (IP64 rated for use in daily life) and can be used in wet environments. (Note: The sensor is not water resistant; avoid dew condensation and dampness.)


Recorded data can be downloaded from RTR-500 Series Data Loggers (Remote Units) via wireless communication with a Base Unit. The wireless communication range between a Remote Unit and a Base Unit is about 150 meters [500 ft]. By registering an RTR-500 as a Repeater, it can be used to expand the wireless communication range. RTR-503/507: Maximum of 8,000 data sets One data set consists of readings for Temperature and Humidity measurements. A Base Unit can download via wireless communication one RTR-503 Remote Unit at full logging capacity (8,000 data sets) in about four minutes.

The RTR-500 Series Data Loggers use one Lithium Battery (LS14250). At normal temperature, if recorded data is downloaded once a day or if monitoring is carried out once every ten minutes, the estimated battery life will be about ten months.
Model names which include "L" are designed with a large capacity battery pack. Under the same conditions, L-type models will continue for about four years without the need to change the battery.

* Battery life varies depending upon the type of battery, the measuring environment, and the frequency of communication. All estimates are based on operations carried out with a new battery and are in no way a guarantee of actual battery life.

RTR-500 Series setup
TR-3310 Cable Length: 1.0m
Possible Temperature Measurement Range: 0 to 55 °C
Possible Humidity Measurement Range: 10 to 95%RH
Sensor Temperature Resistance: -10 to 60 °C
Sensor Response Time: About 7 min. (90% response)
Temp Measurement Accuracy: Average +/-0.3 °C
Humidity Measurement Accuracy: +/-5%RH (At 25 °C, 50%RH)
Operational Conditions: Do not expose to condensation, dampness, corrosive gases or organic solvents.

The service life of humidity sensors can vary greatly depending on operating environment. Periodic calibration may be required.
Materials: (1)Temperature/Humidity sensor, (2) Polypropylene resin, (3) Vinyl Coated Electrical Wire TR-3310 Unit: mm


FCC model / CE model RTR-501/501L RTR-502/502L RTR-503/503L
Measurement Channels Temperature 1ch (Internal) Temperature 1ch (External) Temperature 1ch, Humidity 1ch (External)
Sensor Thermistor Thermistor Thermistor Polymer Resistance
Measurement Units °C, °F °C, °F °C, °F %
Measurement Range -40 to 80 °C -60 to 155 °C 0 to 55 °C 10 to 95%RH
Accuracy Avg ±0.5 °C Avg ±0.3 °C
[-20 to 80 °C]
Avg ±0.5 °C
[-40 to -20 °C /80 to 110 °C]
Avg ±1.0 °C
[-60 to -40 °C /110 to 155 °C]
Avg ±0.3 °C ±5%RH
[at 25 °C and 50%RH]
Measurement Resolution 0.1 °C 0.1 °C 0.1 °C 1%RH
Responsiveness Thermal Time Constant:
Approx. 15 min.
Approx. 25 min.(L Type)

Response Time (90%):
Approx. 35 min.
Approx. 47 min.(L Type)
Thermal Time Constant:
Approx. 30 sec. (in air)
Approx. 4 sec. (in agitated water)

Response Time (90%):
Approx. 80 sec. (in air)
Approx. 7 sec. (in agitated water)
Response Time (90%):
Approx. 7 min.
Logging Capacity 16,000 readings 8,000 data sets (One data set consists of readings for multiple channels.)
Recording Intervals Select from 15 choices:
1,2,5,10,15,20,30 sec. or 1,2,5,10,15,20,30,60 min.
Recording Mode(*1) Endless (Overwrite oldest data when capacity is full)
or One Time (Stop recording when capacity is full)
LCD Display Items Measurements (alternating display for multiple channel devices), Battery Life Warning, etc.
Communication Interfaces Wireless Communication (Short Range Radio Communication):
?_«FCC Part15 Section247 / IC RSS-210 (Frequency Range: 902 to 928MHz, RF Power: 7mW)
?_«ETSI EN 300 220 (Frequency Range: 869.7 to 870MHz, RF Power: 5mW)
Optical Communication
Wireless Transmission Range Approx. 150 meters (500 ft) if direct and unobstructed
Power Lithium Battery: LS14250(*2) x 1
L Type: Large Capacity Battery Adaptor Kit (RTR-500B1)(*3)
External Power Adaptor Kit (RTR-500A1: sold separately)
Battery Life (*4) About 10 months
L Type: About 4 years
Dimensions H 62 mm x W 47 mm x D 19 mm
L type: H 62 mm x W 47 mm x D 46.5 mm
(excluding protrusions and sensor)
Antenna length: 24 mm
Weight Approx. 56g
L Type: approx. 109g
(including battery / excluding sensor)
Operating Environment -40 to 80 °C (-30 to 80 °C during wireless communications)
Waterproof Capacity IP67: immersion proof IP64: Splash proof (rated for use in daily life) (*5) IP64: Splash proof (rated for use in daily life) (*5)
Note: Sensor is not water resistant.
Accessories - Temperature Sensor (TR-5106) Temperature/Humidity Sensor (TR-3310)
Lithium Battery (LS14250) or Large Capacity Battery Adaptor Kit (RTR-500B1), Strap, User's Manual (Warranty Included)
Compatible Base Units RTR-500, RTR-500NW/500AW, RTR-500DC, RTR-500GSM
  • (*1) Only "Endless" is available when using RTR-500W for Windows or RTR-500GSM for Windows.
  • (*2) The included lithium battery (LS14250) is not sold in stores. Please purchase the optional battery set (TR-11P2) for replacement.
  • (*3) When using RTR-500B1 it is necessary to purchase Lithium Battery (LS26500). For details, contact your local authorized distributor.
  • (*4) Battery life varies depending upon the ambient temperature in which it is used, the recording interval, the frequency of communication, and the battery performance. All estimates are based on operations carried out with a new battery and are in no way.
  • (*5) This is the waterproof capacity of the data logger with the sensor connected.
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