Measurement
Display appears by pressing the
The power supply turns off automatically about 3 minutes after the last key operation has been finished. For canceling the auto off function, press
After several seconds, the sensor number is displayed as shown in (2).
(Note) The display number may change from 01 to 09 according to the kinds of sensor, etc. However, it does not affect any measurement at all.
After several seconds, a measured temperature value is indicated in the upper column, while a measured humidity value is indicated in the lower column as shown in (3).
The initial value of the humidity unit shows a relative humidity. It changes in the order of %RH (relative humidity) → ˚ C (˚ F) (dew point) → ˚ C (˚ F)flickering
(4)shows an example of the dew point indication, while (5) shows an example of the
For finishing the measurement, press
KEY OPERATION METHOD WHEN THE UNIT IS
PROVIDED WITH A MEMORY FUNCTION
Data Collection
1. Present time setting
Display flickers when pressing [WRITE] key.
[Year] flickers when pressing [READ] key and it advances stepwise, each time [READ] key is pressed once.
When a desired [Year] has been displayed, press the [WRITE] key to define the year.
For [Month], [Day], [Hour], and [Minute], press [READ] key until they reach a desired value respectively and press [WRITE] key to define them.
By pressing [CLEAR] key, the setting returns to the last one.
2.Setting of the data collection start time Set the data collection start time.
After setting the present time, display flickers.
[Year] flickers when pressing [READ] key and it advances stepwise, each time [READ] key is pressed once.
When a desired [Year] has been displayed, press the [WRITE] key to define the year.
For [Month], [Day], [Hour], and [Minute], press [READ] key until they reach a desired value respectively and press [WRITE] key to define them.
By pressing [CLEAR] key, the setting returns to the last one. Set the reservation time ahead from the present time without fail.
3. Collection and stop
When the reservation time has been set, the confirmation chime sounds. After about 3 minutes, the display appears, and the data collection is started from the reservation time.
For stopping the data collection, press
When the data collection start time has already been set, data collection is executed at the preset time even if the power supply is turned off.
4. Memory
Data can be collected by [temperature, humidity] x 1500.
Data collection is stopped when the memory capacity is fully filled with data. The measuring interval is fixed to 10 minutes.
If data collection was interrupted halfway, past data are valid, but subsequent old data become invalid. (Preset 1000 data are valid, but the 500 data collected last become invalid.)
4.2 RS232 Communications
DATA READ
1. Connection to personal computer
Prepare an NEC PC98 series personal computer.
Connect RH31 to the personal computer by using the attached cable. Attached
Personal computer
2. Setting of personal computer
Set
Transfer speed: 1200 bps
Character length: 7 bits Parity: None
Stop bit: 2 bits X parameter: None
3. Data read and stop
Data are transmitted to the personal computer by pressing the [READ] key.
In this case, data are transmitted in the units of humidity selected by [SEL] key. Data read is stopped by pressing [CLEAR] key.
Read data (text format) are as shown below
Specify the delimiters of data by comma [,], and use the table calculation soft- ware (EXCEL, Lotus123, etc. for example). Measured values are described on the
cell numerically. |
|
a. Collection interval | b. number |
c. Temperature | d. Humidity |
e. Measurement start year, month, day, and hour %RH: Relative humidity C(F): Dew point $C($F):
7 | 8 |
