The G448 is a DIN rail mount, bridge or strain gauge input signal conditioner with 1800VDC isolation between input, output and power. The field configurable input and output offer flexible, wide ranging capability for bridge or strain gauge input applications from 0.5mV/V to over 50mV/V.

Wide ranging, precision zero and span pots allow 50% adjustablity of offset and gain within each of the 11 switch selectable input ranges. The output can be set for either 0-5V, 0-10V, 0-1mA, 0- 20mA or 4-20mA.

Application

Three way isolation in the G448 completely eliminates ground loops from any source. Isolation protects expensive SCADA systems from ground faults and provides filtering for noise reduction which can be a significant problem with small, millivolt, bridge signals. Wide ranging flexibility allows the user to easily zero out dead-loads in weighing systems or configure bipolar input ranges for expansion-compression or vacuum-pressure bridge applications.

Diagnostic LED

The G448 is equipped with a dual function LED signal monitor. The green, front mounted LED indicates both DC power and input signal status. Active DC power is indicated by an illuminated LED. If the input signal is more than 110% of the full scale range, the LED will flash at 8Hz. Below -10%, the flash rate is 4Hz.

Configuration

The G448 has 11 input range switch settings. Trim potentiometers allow 50% input zero and span adjustablity within each of the 11 full-scale, input ranges.

For example, the 200mV switch setting in Table 1 configures the input for a 0 to 200mV range. Since the span can be contracted by 50%, this enables an input span as narrow as 100mV of the range, or 50%. This span can be positioned anywhere within the 0-200mV range with a zero off-set as large as 50% of the full scale range (e.g. 100 to 200mV input).

Input Voltage 

• Full Scale Range: 10mV to ±200mV

• Impedance: >1M Ohms

• Overvoltage: intermittent 400V, max.; continuous 264V, max.

Common Mode (Input to Ground)   1800VDC, max.

• Zero Turn-Up: 50% of full scale range

• Span Turn-Down: 50% of full scale range

• Operation: direct or reverse acting

Output Voltage 

• Output: 0-5V, 0-10V

• Impedance: <10 Ohms

• Drive: 10mA, max. (1K Ohms, min. @ 10V)

• Current Output: 0-1mA, 0-20mA, 4-20mA

• Impedance: >100K Ohms

• Compliance: 0-1mA; 7.5V, max.(7.5K Ohms, max.)

  • 0-20mA; 12V, max. (600 Ohms, max.)

  • 4-20mA; 12V, max. (600 Ohms, max.)

Bridge Excitation   

1 to 10VDC, 120mA max.

Accuracy Including Linearity, Hysteresis  ±0.1% typical, ±0.2% maximum of selected input range at 25°C.

Stability  

±0.025%/°C typical, 0.05%/°C maximum, of selected full scale input range.

Output Noise (maximum)   

0.1% of span, rms, or 10mV whichever is greater.