The Ultra SlimPak G438 is a DIN rail mount, potentiometer input signal conditioner with 1800VDC isolation between DC power and the input/output circuitry. The input provides a constant voltage and is designed to accept any three-wire potentiometer from 100W to 100KW. The field configurable output is switch selectable providing either 0-5V, 0-10V, 0-1mA, 0-20mA or 4-20mA DC signal.

Application

Wide ranging, precision zero and span pots, used in conjunction with DIP switches, allow 80% adjustablity of offset and gain to transmit a full scale output from any 20% portion of the potentiometer input.

The G438's high density DIN rail mounting offers an extremely compact solution for saving valuable panel space.

Configuration

A major advantage of the G438 is its wide ranging capabilities and ease of configuration.

For example, in a valve positioning application a potentiometer is sometimes used as a feedback signal. Quite often a wide open valve is only a 25% turn of the feedback potentiometer. In this case the G438 can easily be adjusted with the zero and span to provide a full scale output signal (e.g. 4-20mA) representing 0-25% or even 50- 75% of the potentiometer input.

Unless otherwise specified, the factory presets the Model G438 as follows: Input Range: 0 to 100%/Output: 4 to 20mA.

The DC power input accepts any DC source between 9 and 30V; typically a 12V or 24VDC source is used (see Accessories).

For other output ranges, refer to Tables 1 and 2 to reconfigure switches SW1 and SW2 for the desired input and output ranges.

Potentiometer Input     

• Resistance (End to End): 100W up to 100KW

• Input Impedance: >1MW

• Input Excitation: 500mV, 5mA maximum drive.

• Zero Turn-Up: 80% of full scale input

• Span Turn-Down: 80% of full scale input (Table 1)

• Common Mode Rejection: 1800VDC (input to ground)

Output 

Voltage Output    

• Output: 0-5V, 0-10V

• Source Impedance: <10W

• Drive: 10mA, max. (1KW min. @ 10V)

Current Output    

• Output: 0-1mA, 0-20mA, 4-20mA

• Source Impedance: >100KW

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

  • 0-20mA; 12V, max. (600W, max.)

  • 4-20mA; 12V, max. (600W, max.)

Accuracy Including Linearity, Hysteresis  ±0.1% maximum at 25°C.

Stability  Temperature:  

<±0.05%/°C maximum of full scale range.

Response Time (10 to 90%)   

<200mSec., typical.

Common Mode Rejection   

DC to 60Hz: 120dB