Analogue Signal Converter

Our range of signal converters provide a convenient way of converting almost any input voltage or current to commonly used process signal levels. Voltages of down to 50 mV can be converted to a standard current or voltage output. Customized input and output requirements can usually be met on request. A high quality instrumentation amplifier forms the input stage with galvanic isolation between input and output. A filter with adjustable time constant between 0 and 20 seconds is also provided for the filtering of noisy signals.

Analogue conversion is used so that frequencies of up to 10 kHz can be accomodated if needed.

Applications:

Signal conversion.

Filtering of noisy signals.

Elimination of the effects of ground loops from distributed process signals.

The protection of signals against common mode interferences such as motors, contactors and power line surges.

Process signal amplification in situations where the line impedance is too great to effectively drive the required instrumentation.

The current input versions have 50 Ω input impedance and add very little additional loop resistance.

The outputs can drive loads of up to 500 Ω which is sufficient to drive a measurement loop of several kilometres.

Individual channel isolation and the elimination of common mode offsets for non-isolated computer and PLC inputs.

Specifications:

• Standard input signal ranges from 0-50 mV, ±10 V to 4-20 mA.
• Bipolar input and output configurations.
• Customised input and output ranges on request.
• Input impedance of >100 kΩ for the voltage input and 50 Ω for the current input models.
• Maximum input signals of 250 V for voltage input and 100 mA for the current input.
• Output signal ranges of 0-10V, ±10 V, 4-20 mA and 0-20 mA.
• Output load >2 kΩ for the voltage output and 500 Ω maximum for the current output.
• Multi-turn trimpot adjustment for zero and span on the front of the unit.
• Adjustable filter with time constant from 0 to 20 seconds.
• Frequency response 1 kHz with filter disabled.
• Linearity better than 0.1% of full scale.
• Auxiliary supply 115/230 VAC ±10% 50/60 Hz or 12/24 VDC ±5%.
• Isolation between input and output >1,500 VAC for AC powered versions and >1,000 VAC for DC powered versions.
• Operating temperature -10°C to 60°C.
• 24 hour operational burn-in.
• Calibration sheet provided for each unit manufactured.
• DIN rail mounting with dimensions 40 x 80 x 85 mm (W x H x D).