G005 CSA Approved Galvanic Isolation Amplifier

For use with Positek's intrinsically safe sensors

About the G005

The G005 Galvanic Isolation Amplifier has been designed specifically for use with Positek® Intrinsically Safe position sensors in hazardous Zone 0, 20 Class I, II & III applications and is certified; [Ex ia IIC] [AEx ia IIC]; [AEx ia D IIIC].

Positek® IS sensors are ratiometric i.e. the output signal scales with the supply voltage, to ensure the safe area signal accurately corresponds with sensor displacement it is important that the sensor supply is correct.

The G005 Galvanic Isolation Amplifier provides a regulated and resistively limited +5V dc power supply required by Positek® IS sensors, it can be connected in three or five wire modes. Used in five wire mode positive and negative sense inputs enable the G005 to dynamically adjust the sensor supply thus ensuring the correct voltage across the sensor. Connected in this way the G005 can compensate for 15 conductor resistance. The sense terminals are linked internally so the end user can use the G005 in three wire or five wire mode without the need to fit or remove external links.

The G005 has an input power supply range of 12 to 30 volts dc, making it suitable for a wide range of hazardous area applications. It is tri-port isolated providing isolation between the amplifier power supply, the hazardous area and the G005 output signal. The sensor supply and output are transformer coupled providing 2.5kV isolation between the safe and hazardous area circuits eliminating the requirement for a high-integrity earth.

The output of the G005 is factory configured to either 0.5 to 9.5V or 4-20mA and has a bandwidth of 4.7kHz, making it ideal for servo control loops.

Output options available;
G005-545 0.5 to 9.5V
G005-546 9.5 to 0.5V
G005-425 4 to 20mA
G005-426 20 to 4mA

Versions are also available for potentiometer inputs.

The screw terminal connector plugs are coded to eliminate cross connection.

The G005 can also be supplied configured for use with potentiometers.

Intrinsic Safety

CSA Approval
The Galvanic Isolation Amplifier, suitable for all areas, is CSA approved to:
[Ex ia IIC] [AEx ia IIC] [AEx iaD IIIC]

Power Supply

24V DC nom 12V-30V
Current Consumption (24V Supply)
Approximately 50mA (voltage O/P)
Approximately 70mA (current O/P)
Sensor Supply
5V at 15mA max
Lead Resistance for 15mA
15Ω max (all connections)

Output Options

0.5-9.5V - output resistance 5Ω
Current Loop
4-20mA, load resistance 0-1KΩ

Safety Parameters


Transfer Characteristics

Sensor Input Resistance
<+/- 0.1% FS
Temperature Drift
<0.01% FS/°C for voltage outputs
Setting Time to 1% of Span
<300μs for 10-90% step change
Rise Time
<200μs for 10-90% step change
DC to 4.7kHz (-3db)
2500V between safe area terminals and hazardous area terminals, 50V between power rail (J4) and optput (J3)
Electromagnetic Compatability
EN561236-2-1:2006 (EN31326-1:2006)
Ambient Temperature Range
-20°C to +60°C working
-40°C to +100°C storage
97.3 x 22.5 x 111.9mm
Protection Class
35 x 7.5mm top-hat rail (DIN 46277-3)

Positek offers a range of options for its standard sensors. Each sensor is manufactured to suit each customer's preferences. If your requirement is outside the options given below, Positek can modify/ redesign a sensor to suit your specific requirement. Standard options are available as below:

For use with Positek Intrinsically Safe Sensors

Output Signal
Option Code
0.5 - 9.5V DC
9.5 - 0.5 DC
4 - 20 mA
20 - 4mA

For use with Potentiometers

Output Signal
Option Code
0.5 - 9.5V DC
9.5 - 0.5 DC
4 - 20 mA
20 - 4mA

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