User manual

UNIVERSAL SENSOR SWITCHING MODULE
Instruction manual Page 14
Released 09/2006 Rights reserved for change in technical data! HYGROSENS INSTRUMENTS GmbH Postfach 1054 D-79839 Löffingen Tel: [phone] Fax: [phone]
6.4.5 Mode of operation
Sketch Description
1
Impedance input 100 k: All such components are suitable as sensors in which
the resistance value is a function of the measured parameter e.g. LDRs (photo
resistors) or NTCs (temperature sensors). The sensor with a resistance value
of 0 ..100kOhm is connected at the RJ12 socket between ANA INP (pin 3) and
GND (pin 2).
2
Same as (1), however for sensors with resistance value of 0..10k
3
Same as (1), however for sensors with resistance value of 0..1k
4
Voltage input 0..10V for industrial transducer with voltage output. The probe is
connected at the RJ-12 socket between ANA INP (pin 3) and GND (pin 2).
5
Same as (4) however for voltage input 0..1V
6
Current input 0..20 mA for industrial transducer with current output. The probe
is connected at the RJ-12 socket between ANA INP (pin 3) and GND (pin 2).
The probe current, which flows from ANA IN to ground, is measured. The
shunt in the sensor switch has a resistance value of 50 ohms.
7
By additional bridging of the pins at pos. 1 of the terminal strip, the gain of pre-
amplifier can be increased by a factor 1.6. Combined with other modes of
operation, the following input ranges also emerge out::
(1) 0..63 kOhm (2) 0..6.3 kOhm; (3) 0..630 Ohm;
(4) 0..0.63V (5) 0..6.3V (6) 0..12.6 mA
Caution! The current input is of low ohmic value (50 ohm) and is not protected against
inadvertent entry of external voltages!
The voltage and resistance measuring range are protected against external voltages
up to a level of 20 V. High voltage can lead to failure of components.
6.4.6 Operating voltage connection
An operating voltage of 5V is available at pin 1 of RJ12 socket is available to feed
supply to external circuit amplifiers. The voltage is stabilised and short circuit protected
conforming to specification for integrated voltage regulators 78L05. The maximum
current output should not exceed 10 MA in total. Applying external voltage leads to
damage of components!
A rectified DC operating voltage is available at pin 4 of RJ12 socket to feed supply to
external components. This voltage is between 12V and 30 V DC depending upon the
device model and module operating voltage at input . The supply is unstabilised and
without short circuit protection. The maximum current output should not exceed 25 mA
in total.