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User's Guide
SuperHeat Psychrometer
Models RH350 and RH355 (kit)
Introduction
Congratulations on your purchase of the Extech RH350 SuperHeat Psychrometer. This
device measures Differential Temperature (T1-T2, Air-T1, T1-DP), Humidity, Air
Temperature, Dew Point and Wet Bulb. Advanced features include built-in memory and
recall of up to 99 data points, Min/MAX/Average readings from the captured data, Data
Hold, selectable Auto Power Off, and an RS-232 for capturing readings to a PC using
HyperTerminal (cable sold separately). Careful use of this meter will provide years of
reliable service.
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Table of Contents
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Summary of Contents for Extech Instruments RH355
- Page 1 User's Guide SuperHeat Psychrometer Models RH350 and RH355 (kit) Introduction Congratulations on your purchase of the Extech RH350 SuperHeat Psychrometer. This device measures Differential Temperature (T1-T2, Air-T1, T1-DP), Humidity, Air Temperature, Dew Point and Wet Bulb. Advanced features include built-in memory and...
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Page 2: Specifications
Specifications Function Range and Resolution Accuracy ±3% RH (10 to 90%) Humidity 0.0 to 100.0% RH @ 23°C Temperature (air) -4.0 to 122.0 F (-20 to 50 ±1.8 F (±1 ±0.3% rdg or Temperature (external) T1, T2 -328 to 2250 F (-200 to 1370 ±(1.8 Display... - Page 3 Display Description Air, T1, Air-T1, Dew Point, Low Battery Temperature °C/°F T2, T1-T2, T1-Dew Point, Wet Bulb Temperature °C/°F Date (month, day, year), Time (24 hour clock) Memory Store/Recall Location Relative Humidity % Maximum, Minimum Hold, Average Operation Open the Protective Sensor Cap Twist the protective sensor cap, located at the top of the meter, counter-clockwise a quarter of a turn to expose the sensors.
- Page 4 Minimum (MN) Maximum (MX) Average (AVG) Function The MIN/MAX/Average mode allows the user to view only the lowest (MN), highest (MX) or average readings. Press the [M ] button once and MN appears on the display. The display is now showing the lowest humidity and temperature readings in memory. Press the ] button again and MX appears on the display.
- Page 5 CALIBRATION The following verification and calibration procedures require the 33% and 75% RH reference bottles which are supplied with the Model RH355 kit. Accuracy Verification Checking the 33% or 75% RH Calibration Insert meter’s sensor into the 33% or 75% salt reference bottle...
- Page 6 RS-232 PC Communications Interface RS-232 data format Baud rate; 9600, Parity; none, Data bits; 8, Stop bits; 1, Flow control; none RS-232 Connection Connect the optional interface cable from the meter to the communications port of the PC. Using Windows® Terminal or HyperTerminal program for PC Communication The Terminal or the HyperTerminal program is included in all Windows®...
- Page 7 Ensure that the compartment cover is securely fastened when finished. Warranty EXTECH INSTRUMENTS CORPORATION warrants the basic instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies on sensors and cables). If it should become necessary to return the...
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