COSA Xentaur Hygrocontrol Type 86 Ex - Manual (Page 16)

3.1.3 Display
As an option a digital display is available. The display is arranged under
the cover of the transmitters housing. It will be connected by one of the
two 20-pol. female sockets in the PC-Board in the direction the user
wants and is to be seen through the window in the cover.
Humidity values are shown in the upper line of the display, values of
temperature in the lower line. Both are displayed with a resolution of 0,1
and together with their actual dimension.
3.1.4 Digital Output
Digital outputs may be included as another Option. The Hardware
therefore may be a RS 232 (V24) bus or a RS 485 bus. Digital outputs
are sending values of humidity and temperature together with the
serialnumber of the probe.
It is possible to have digital and analogue outputs in the same instrument
- but then either the analogue or the digital output must be realized with
fixed cable connection. There is no space on the PC-Board for having as
much screw terminals as would be neccessary for both types of outputs.
3.2 Operational Mode "CALIBRATION"
There is a lack of international standards for rel. Humidity calibrations,
therefore, different countries may have different methods of calibrations.
Since the users of humidity meters need a simple method to check the
accuracy of their instruments, we are supplying accessories for calibration
or testing. As a standard method we have chosen unsaturated salt
solutions to create rel. humidities of known amount - but saturated salt
solutions may also be used.
The accuracy of our calibration solutions is proved by comparison with
international standards (UKAS certified). Under laboratory conditions and
carefully avoiding of any possible causes for errors you may reach an
accuracy of ± 0,5 % RH.
Series 86-EX instruments are to be calibrated with rel. humidity - since
their sensors respond to relative, not to absolute, humidity values.
To allow the changing of probes without any further calibration, the values
are stored in a memory inside the probe electronics. Therefore it is
possible to calibrate a type 861 probe with any type 86-EX transmitter.
The length of the connection cable has no influence on the calibration -
only digital signals are transfered.
HYGROCONTROL Manual for Type 86 Ex Page
15