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Lutron HT-306S Professional 4-in-1 Humidity and Thermometer:
The Lutron Model HT-306S is a professional, high-precision 4-in-1 Humidity/Thermometer meter designed for comprehensive environmental assessment. Built using a custom one-chip microprocessor LSI circuit, this instrument ensures maximum possible accuracy and reliable performance for specialized applications. The HT-306S is certified to meet international standards including ISO-9001, CE, and IEC1010.
Core Measurement Capabilities:
The HT-306S provides four essential measurements integrated into one compact device, making it versatile for field use:
1. Humidity (%RH): Utilizes a high-precision capacitance type sensor with a fast response time for accurate measurement of relative humidity.
2. Ambient Temperature: Measures surrounding air temperature directly via the built-in temperature sensor associated with the humidity probe.
3. Dew Point Temperature: This display value is calculated automatically from the measured humidity and ambient temperature values.
4. Wet Bulb Temperature: This display value is also calculated automatically based on the measured humidity and ambient temperature values.
Additionally, the meter functions as a one-channel Type K thermometer, providing an extended temperature measuring capability far exceeding the ambient temperature range, utilizing a standard 2 pin Type K socket for external probes.
Advanced Features and Design:
The meter is engineered for efficiency and ease of use in heavy-duty applications:
• Dual Display: The instrument features a large dual-function LCD display (46 mm x 28 mm) that simultaneously shows key measurements like humidity and temperature for easy readout.
• Data Handling: Includes a Data Hold function to freeze the current reading on the display, and Memory Recall capable of storing and recalling the Maximum and Minimum readings recorded.
• Selectable Units: Users can select and switch between Celsius (°C) and Fahrenheit (°F) measurement units for temperature.
• Automatic Compensation: The meter features automatic temperature compensation for the humidity function readings, ensuring accuracy across the operating range. Linear compensation is also provided for the full range of Type K temperature measurements.
• Portability and Durability: The HT-306S features a heavy duty and compact housing case, designed for easy carry and operation. Its dimensions are 131 x 70 x 27 mm (5.1 x 2.7 x 1.1 inches), and it weighs approximately 115 g (0.25 LB).
• Power Management: The unit is powered by a 006P DC 9V battery and includes a built-in low battery indicator. To conserve battery life, the meter can be defaulted to auto power off, or manually powered off via a push button.
Standard and Optional Accessories:
The HT-306S is supplied standard with the humidity probe and an instruction manual. Type K thermocouple probes are available as optional accessories (such as TP-01, TP-02A, TP-03, TP-04, and TP-05) to take advantage of the meter's wide temperature measurement capabilities.
Technical Specifications (Model: HT-306S):
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Feature
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Specification / Value
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Circuit
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Custom one-chip microprocessor LSI Circuit
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Display
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Dual function LCD (46 mm x 28 mm size)
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Humidity Range
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10% to 95% RH
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Humidity Resolution
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0.1% RH
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Humidity Accuracy (≥ 70% RH)
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± (3% reading + 1% RH)
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Humidity Accuracy (< 70% RH)
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± 3% RH
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Ambient Temperature Range
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0°C to 50°C (32°F to 122°F)
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Ambient Temp. Accuracy (°C)
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± 0.8°C
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Ambient Temp. Accuracy (°F)
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± 1.5°F
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Dew Point Range (°C)
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-25.3°C to 48.9°C (Calculated)
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Wet Bulb Range (°C)
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-21.6°C to 50.0°C (Calculated)
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Type K Range (°C)
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-50.0 to 1300.0°C and -50.1 to -199.9°C
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Type K Accuracy (-50.0 to 1300.0°C)
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± (0.4% + 0.5°C)
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Temperature Resolution (All Modes)
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0.1 degree
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Sampling Time
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Approx. 1 second
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Data Functions
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Data Hold, Max/Min Recall
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Power Supply
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006P DC 9V battery
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Power Current
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Approx. DC 3.5 mA
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Dimensions (L x W x T)
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131 x 70 x 27 mm (5.1 x 2.7 x 1.1 inch)
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Weight
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115 g / 0.25 LB
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Operating Temperature
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0°C to 50°C
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Operating Humidity
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Less than 80% R.H.
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Humidity Sensor Type
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High precision capacitance type
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