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Generic Sensor Board for Oxygen Sensors by SENSORE Electronic - GSB

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• Microcontroller based interface circuit
• Compatible O2-Sensor-types: SO-zz-xxx, SP-zz-xxx
• Typical current consumption 200mA @ 12Vdc
• Linear sensor output signal according to O2-concentration
• External voltage supply: 12Vdc
• Configurable sensor operation parameters
• Heater temperature control

Model Number: GSB
Data Sheet:

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Product Specification

Generic Sensor Board
"GSB" (Generic Sensor Board) is a universal electronic module for all sensor types. It can be used both for controlling the amperometric and potentiometric sensors.

At this module, sensor temperature is precisely controlled to a constant temperature by microcontroller. The linearized output signal is available as a voltage signal (0-5V), current signal (4-20mA) or digital via RS232.

Electronic sensor interface for oxygen sensors
• Sensor interface board for direct integration in customer application
• Demonstration board for laboratory sensor evaluations

GSB - Generic Sensor Board Main Features
• Microcontroller based interface circuit
• Compatible O2-Sensor-types:
Standard: SO-zz-xxx (amperometric sensor type)
On request: SP-zz-xxx (ampero-potentiometric sensor type)
• External voltage supply: 12Vdc (possible range 6-25Vdc)
typical current consumption 200mA @ 12Vdc
• Sensor calibration
Single point calibration at specified O2-concentration
heater resistance calibration to ensure correct sensor temperature
Calibration values are stored in nonvolatile memory
possibility to purchase a factory calibrated set (GSB+sensor)
• Linear sensor output signal according to O2-concentration:
analog 0-5V (Vout)
analog 4-20mA (Iout)
digital via RS232
• Configurable sensor operation parameters
6 preinstalled settings for different sensor types
optional: customized parameters, e.g. :
▪ heatup time and heater operation mode
▪ sensor voltage
▪ Measurement range and corresponding output signals
• Heater temperature control:
4-wire heater resistance measurement
constant heater resistance control for temperature compensation
optional: constant heater voltage or constant power control
• Sensor connection:
connection via 6pol RAST 2.5
connection via screw terminal
optional: directly soldered on GSB-PCB

GSB - Generic Sensor Board Advanced options on request
• Configurable digital I/Os, e.g.:
Open collector outputs to switch external loads
▪ based on programmable O2-concentration thresholds
▪ programmable switching hysteresis
customized sensor status indication, e.g. error indicator
• Configuration via RS232
flexible configuration of sensor operation parameters
configuration interface for Windows-OS
• Customized GSBs
to implement customer specific digital or analog interfaces
customer specific terminals as replacement for screwed terminals
cost optimization for higher volumes
• Customized firmware

GSB - Generic Sensor Board Basic Specification
Absolute maximum ratings
Values beyond these limits might cause permanent damage

Symbol	Parameter	min.	max	Unit
Vcc	External power supply voltage	6	25	V
Top	GSB operating temperature range	0	50	°C
RIout	Load on Iout	0	270	Ω
IVout	load current on Vout	0	1	mA
Ioc	Open collector sink current (each)	0	50	mA
Voc	Open collector voltage	5	30	V
VinR232	Input voltage range R232	-25	25	V

* Only tested at 25 °C with soldered sensor.

Recommended operating conditions
For optimal measurement performance the GSB should be operated at recommended conditions

Symbol	Parameter	min.	max	Unit
Vcc	External power supply voltage	11	12	V
Top	GSB operating temperature range	15	25	°C
RIout	Load on Iout	0		Ω
IVout	load current on Vout	0		mA
Iocsum	Open collector sink current (sum)	1		mA

Remarks:
▪ Top refers only to the GSB ambient temperatures, an external connected sensor is not affected by this limitation
▪ Iout refers to the 4-20mA analog output and Vout refers to the 0-5V analog output
▪ Ioc and Voc are only of relevance, if the open collector outputs are used

Analog output levels

Symbol	Output level	Condition	min.	typ.	max	Unit
Vout	Full scale	recommended conditions, calibrated at full scale	4.975	5	5.025	V
	Zero point		0	0.01	0.025	V
Iout	Full scale		19.95	20	20.05	mA
	Zero point		3.95	4	4.05	mA

Preinstalled sensor settings for SO-zz-xxx
The basic GSB configuration contains the following preinstalled sensor settings, to be selected via DIP switch. SP-zz-xxx configurations on request

		DIP Switch Bit			sensor description	GSB full scale	O2 calibration concentration	sensor voltage	heater control
	sensor type	1	2	3	sensor description	GSB full scale	O2 calibration concentration	sensor voltage	heater control
0	reserved	ON	ON	ON	-	-	-	-
1	SO-zz-001	OFF	ON	ON	ppm	1000 vol.-ppm O2	1000 vol.-ppm O2	0,70 Volt	Rconst
2	SO-zz-010	ON	OFF	ON	1%	1 vol.-% O2	1 vol.-% O2	0,75 Volt	Rconst
3	SO-zz-020	OFF	OFF	ON	2%	2 vol.-% O2	2 vol.-% O2	0,75 Volt	Rconst
4	SO-zz-050	ON	ON	OFF	5%	5 vol.-% O2	5 vol.-% O2	0,80 Volt	Rconst
5	SO-zz-250	OFF	ON	OFF	25%	25 vol.-% O2	209 vol.-% O2	0,85 Volt	Rconst
6	SO-zz-960	ON	OFF	OFF	96%	100 vol.-% O2	209 vol.-% O2	1,60 Volt	Rconst
7	reserved	OFF	OFF	OFF	-	-	-	-

* The specified sensor full scale concentration is 96%

Measurement accuracy – sensor characteristic
If operated at recommended conditions the measurement accuracy will be primarily limited by the sensor accuracy. Also the dynamic sensor characteristic will not be significantly changed by the GSB. See Sensor data sheet for more details.

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