Lutron Ht-315 Humidity Meter User Manual

LUTRON HT-315 Humidity Meter

Model : HT-315

FEATURES

• Humidity + Temperature + Dew point are combined into one meter, intelligent and professional.
• 0.01 %RH resolution for the humidity reading, 0.01 degree resolution for the Temp. reading.
• Pocket size with Separate humidity & temp. probe, easy operation. & remote measurement.
• Fast humidity measuring response time.
• High accuracy and high precision.
• Dew point measurement.
• Manual and auto manual data logger.
• Just few panel buttons, easy operation.
• Microprocessor circuit assures maximum possible accuracy, provides special functions and features.
• LCD with two display, easy readout.
• Heavy duty & compact housing case, designed for easy carry out & operation.
• Records Maximum and Minimum readings with Recall.
• Auto shut off saves battery life.
• Data hold function for freezing the desired value on display.
• RS 232 PC serial interface.
• Show the humidity & temperature values on the LCD display at same time.
• Built-in low battery indicator. Wide humidity & temp. measuring range.
• DC 9V power adapter input socket.

SPECIFICATIONS

General Specifications

Electrical Specifications 23± 5 ℃

Humidity/ Temperature

Dew Point

@ Above specification tests under the environment RF Field Strength less than 3 V/M & frequency less than 30 MHz only.

FRONT PANEL DESCRIPTION

1. Display
2. Power Button
3. Hold Button ( Esc Button )
4. REC Button ( Enter Button )
5. Function Button ( Send Button )
6. Set Button ( Logger Button )
7. Battery Compartment/Cover
8. RS-232 Output Terminal
9. Probe Input Socket
10. Probe Plug
11. Probe handle
12. Probe head ( Humidity & Temperature )
13. DC 9V Power Adapter Input Socket

GENERAL MEASURING PROCEDURE

The meter default value are :

• The temperature reading unit is ℃.
• The auto power off.

Humidity and Temperature measurement

1. Plug the ” Probe Plug ” ( 3-10, Fig. 1 ) into the ” Probe Input Socket ” ( 3-9, Fig. 1 ).
2. Power on the meter by pressing the ” Power Button ” ( 3-2, Fig. 1 ), the LCD shows the unit ” %RH ” & ” ℃ ” at the same time and measured value will show on
   the display ( upper display is Humidity value, the
   lower display is the temperature value ) .
3. The meter Temp. display unit is defaulted to ” ℃ “. If intend to let the meter’s temperature unit default to ” ℉ ” , then please refer section 5-1 ( page 9 ).

Dew point measurement
The procedures of ” Dew point measurement ” are same as the above ” 4-1 Humidity and Temperature measurement ” except select the ” Dew point ” function by pressing the ” Function Button ” ( 3-5, Fig. 1 ) once, the LCD will show the unit ” DEW ” & ” ( or ℃℉ ). The upper display show the Dew point value, the lower display show the temperature value

Data Hold
During the measurement, press the ” Hold Button ” ( 3-3, Fig. 1 ) once will hold the measured value & the LCD will display a ” HOLD ” symbol. * Press the ” Hold Button ” once again will release the data hold function.

Data Record ( Max., Min. reading )

• The data record function records the maximum and minimum readings. Press the ” REC Button ” ( 3-4, Fig. 1 ) once to start the Data Record function and there will be a ” REC. ” symbol on the display.
• With the ” REC. ” symbol on the display :
  • a) Press the ” REC Button ” ( 3-4, Fig. 1 ) once, the ” REC. MAX. ” symbol along with the maximum value will appear on the display. If intend to delete the maximum value, just press the ” Hold Button ” ( 3-3, Fig. 1 ) once, then the display will show the ” REC. ” symbol only & execute the memory function continuously.
  • b) Press the ” REC Button ” ( 3-4, Fig. 1 ) again, the ” REC. MIN. ” symbol along with the minimum value will appear on the display. If intend to delete the minimum value, just press the ” Hold Button ” ( 3-3, Fig. 1 ) once, then the display will show the ” REC. ” symbol only & execute the memory function continuously.
  • c) To exit the memory record function, just press the ” REC ” button for 2 seconds at least. The display will revert to the current reading.

ADVANCED MEASURING PROCEDURE

Before executing advanced adjustment procedures, exit the ” Hold function ” and the ” Record ” function.

1. a. Hold the ” Set Button ” ( 3-6, Fig. 1 ) at least two seconds until the lower display show ” COde “, then release the ” Set Button “, the upper display will show ” 1000 “.
   1. 1000 is the password code that allow to execute the Advanced Measuring Procedure following.
      After display show ” COde 1000 “, push the ” Enter Button ” ( 3-4, Fig. 1 ) once will go to the following b. procedures.
   2. If push the ” ESC Button ” ( 3-3, Fig. 1 ) will escape the selecting function and return to the normal measuring display.
2. b. One by one to press the ” Set Button ” ( 3-6, Fig. 1 ) once a while to select the two main function that show on the lower display as
   1. ℉ ……. Change the Temp ℃, ℉ unit
   2. OFF…….Auto power ON/OFF management

Change the Temp ℃, ℉ unit
Use the ” Set Button ” to select the main function to ” ℉ “, then one by one to press the ” Function Button ” ( 3-5, Fig. 1 ) a while will determine the default Temp. unit to ℃ or ℉

• Press the ” Function Button “, if the upper display value show ” 0 “, the default Temp. unit is ℃
• Press the ” Function Button “, if the upper display value show ” 1 “, the default Temp. unit is ℉.

After the function is determined, press the ” Enter Button ” ( 3-4, Fig. 1 ) to confirm and save the selection data into memory IC permanently. Press the ” Esc Button ” ( 3-3. Fig. 1 ) will revert to normal display screen.

Auto power ON/OFF
Use the ” Set Button ” to select the main function to ” OFF “, then one by one to press the ” Function Button ” ( 3-5, Fig. 1 ) a while will determine the default the power management system is Auto Power Off enable or disable.

• Press the ” Function Button ” once, if the upper display value show ” 0 “, it is not Auto Power Off management ( disable ).
• Press the ” Function Button ” once, if the upper display value show ” 1 “, it is the Auto Power Off management ( enable ).

After the function is determined, press the ” Enter Button ” ( 3-4, Fig. 1 ) to save the selection function into memory IC permanently. Press the ” Esc Button ” ( 3-3. Fig. 1 ) will revert to normal display screen.

RS232 PC SERIAL INTERFACE

The instrument has RS232 PC serial interface via a 3.5 mm terminal ( 3-8, Fig. 1 ). The data output is a 16 digit stream which can be utilized for user’s specific application. A RS232 lead with the following connection will be required to link the instrument with the PC serial port.

The 16 digits data stream will be displayed in the following format : D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Each digit indicates the following status

RS232 FORMAT : 9600, N, 8, 1

BATTERY REPLACEMENT

1. When the left corner of LCD display show “ “, it is necessary to replace the battery. However, in-spec. measurement may still be made for several hours after low battery indicator appears before the instrument become inaccurate.
2. Slide the ” Battery Cover ” ( 3-7, Fig. 1 ) away from the instrument and remove the battery.
3. Replace with 9V battery ( Alkaline or Heavy duty type ) and reinstate the cover.
4. Make sure the battery cover is secured after changing the battery.