SGA Analogue Strain Gauge Amplifier

Very Stable Bridge Excitation
Selectable Sensitivity
High Frequency Filtering
User Selectable Analogue Outputs
High Specification
IP65 ABS field case with cable glands
Surface mount PCB
Wide range filtering 1Hz to 5kHz
Switch selectable offset ±70% FS
Shunt Calibration facility (120Kohms) Excitation: regulated 10V @110mA

The SGA range of strain gauge amplifiers offers great flexibility. Both the 110/230Vac powered SGA/A and 18-24Vdc powered SGA/D offer 10volt on-board excitation, capable of powering up to 4off 350ohm strain gauge bridges. Please note that the 110/230Vac can also be DC powered.

With an input sensitivity range of ±0.06 to ±29 mV/V. Any sensor in this input range can be amplified to give ±10V, ±5V, 0-10V, 0-5V, 0-20mA or 4-20mA outputs.

There is also a wide offset control, using a combination of switches and a potentiometer. This gives an adjustment range of ±70%.

The SGA is an ideal product for many OEM customers, as its flexibility means that it can be configured to suit most applications.

The SGA can be supplied calibrated with any of LCM Systems sensor range or could be integrated with a larger instrumentation system.

Parameter
	Min	Typ	Max	Units
Power supply (SGA/A):- (110/230Vac) 50 - 60Hz	-	110/230	-	V AC
Power supply DC :-	18	-	24*	V DC
Power supply current DC :- (depends on loading )	50	90	200	mA
Bridge excitation 350R Bridge	9.5	10	10.5	VDC
Bridge resistance	85	-	-	Ohms
Bridge sensitivity (Switchable)	0.06	2.5	29	mV/V
Gain adjustment (Pot - fine adjustment.)	0.06	-	1.0	mV/V
Offset adjustment (Pot - fine adustment.)	-1.25	-	+1.25	%FR
Offset adjustment (Switchable - coarse adjustment)	±1.25	-	±79	%F
Output load (Voltage output)	-	-	2	mA
Output load (Current output)	0	-	500	Ohms
Bandwidth (No filter and > 2mV/V) -3dB point	DC	-	6	kHz
Filter cut-off (Switchable ranges) -3dB point	1	-	5000	Hz
Zero temperature coefficient (@2.5mV/V)	-	0.002	0.009	%/ºC@2.5mV/V
Span temperature coefficient	-	0.007	0.01	%°C
Linearity	-	0.03	-	%FR
Gain stability -1st 1000 Hours	-	0.2	-	%FR
Gain stability - 2nd 1000 Hours	-	0.1	-	%FR
90 day Offset stability	-	3.3	-	uV
Output load stability gain (0 - 100%)	-	-	0.01	%FR
Output load stability offset (0 - 100%)	-	-	0.01	%FR
Power supply rejection gain (0 - 100%)	-	-	0.01	%FR
Power supply rejection offset (0 - 100%)	-	-	0.01	%FR
Operating temperature range	- 20	-	50	°C
Storage temperature range	-40	-	70	°C
Humidity	-	-	95	%
*N.B. 18V max at full load FR= Full Range
Output options set by on board switch	±10V, ±5V, 0-10V, 0-5V, 0-20mA, 4-20Ma
Connections	Field screw terminals - 2.5mm² rising clamp
Enclosure	ABS case 160 x 80 x 55sealed to IP65 fitted with 3off cable glands
Controls	Gain pot Offset pot Coarse gain switches Coarse offset switches Filter cut-off switches Output mode switch
CE & Environmental
Storage temperature	-20 to +70ºC
Operating temperature	-10 to 50°C
Relative humidity	95% maximum non condensing
Safety/Low Voltage Directive	73/23/EEC amended by 93/68/EECBS EN 61010-1:2001, IEC 1010-1-1990
EMC Directive	89/336/EECBasic Standard BS EN 61326:1998
EMC Emissions	BS EN 55011:1998
EMC Immunity	BS EN 61000-42:1995 BS EN 61000-4-3:2002 BS EN 61000-4-4:2004 BS EN 61000-4-11:200
Order Codes	SGA/A - 110/230v ac and/or 18-24v dc powered
	SGA/D - 18-24v dc powered

Click here to download - SGA Datasheet

Click here to download - SGA Instruction Manual

Listed below are some of the other Instruments in our range that can interfaced with any of the SGA range of products:-

ADP15 Panel Mounting Process Input Digital Indicator/Controller

ADP15-DI Dual Input Panel Mounting Digital Indicator/Controller

There are currently no options available to view from this page. To view the various input and output options available for the SGA, please view the SGA product datasheet by clicking here.

Force measurement systems
Interface sensors to chart recorders
Simple weighing systems
Conversion of load cell signals for long cable run applications

SGA Analogue Strain Gauge Amplifier

Parameter

CE & Environmental