COSA Xentaur Hygrocontrol Type 72 - Manual (Page 5)

Series 72 Manual page 1
1. Fundamental Features of Series 72
Series 72 Humidity and Temperature Meters detect relative Humidity and
Temperature. For this purpose the probes - either fixed mounted or
interchangeable ones - are equipped with a capacity type humidity sensor of
very small mass. The temperature detection is done by a RTD of type Pt-1000,
which is placed very close to the humidity sensor to avoid differences in
temperature between the two sensors. To assure rapid response to temperature
changes, a thinfilm Pt-1000 on a substrate of ceramic was chosen.
Incoming sensor signals are temperature compensated and transfered into
linearized analog or digital outputs by digital electronics. We use a
microprocessor for the control of all internal functions. Programing and
configurating of the desired ranges and functions is easy due to the dialog
orientated software. Only four buttons are required. In addition, the
microprocessor provides absolute humidity values by calculating them from
relative humidity and temperature, if atmospheric pressure is assumed, or
pressure is known and typed in by pushbuttons. As a standard, the dual line
display is able to show the temperature in °C or °F and the humidity as:
a) rel. Humidity: in %
b) abs. Humidity: in g/m 3
c) Watercontent: in g/kg
d) Dewpoint: in °C or °F
e) Enthalpy: in Joule
The software of series 72 instruments is divided into 4 modules which can be
called by the operator. These are named:
a) "RUN" = normal measuring mode
b) "LIST" = display of all actual parameters
c) "CALIB" = calibration of a probe
d) "CONFIG"
= configuration of display and outputs
By using SMD-techniques, it was possible to build in all the electronics for
transmitting the temperature and humidity sensor signals into a IP-65 housing of
80 x 82 x 55 mm. Only special options, like RS-232 / V24 output, need a larger
housing (80 x 160 x 55 mm).
2. Preparations before Operating
2.1. Unpacking and Checking
Every instrument has been examined before dispatch in respect to its electrical
and mechanical functions. After receipt of instrument, please check its
operation. In case of any malfunction or damage, return the instrument with a
detailed description of faults.