Product Description
G438 Signal Conditioner
G438 Signal Conditioner
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.
Calibration
- With power disconnected, set the output and input switch selectors (SW1 and SW2) to the desired ranges (Tables 1 and 2).
- Connect the input and output as shown in Figure 1. Connect the output to the actual device load (or a load approximately equivalent to the actual device load value) and apply power.
- Set the input potentiometer to the desired minimum and adjust the zero potentiometer for the desired minimum output.
- Set the input potentiometer to the desired maximum and adjust the span potentiometer for the desired maximum output.
- Repeat steps 3 and 4, if necessary, for best accuracy. eter to the desired minimum and adjust the zero potentiometer for the desired minimum output.
- Set the input potentiometer to the desired maximum and adjust the span potentiometer for the desired maximum output.
- Repeat steps 3 and 4, if necessary, for best accuracy.
TECHNICAL SPECIFICATION (G438)
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
Isolation
1800VDC between line power and input, output
EMC Compliance (CE Mark)
- Emissions: EN50081-1
- Immunity: EN50082-2
- Safety: EN50178
LED Indication (green)
Active DC power
Humidity (Non-Condensing)
- Operating: 15 to 95% (@ 45°C)
- Soak: 90% for 24 hours (@ 65°C)
Temperature Range
- Operating: 0 to 55°C (32 to 131°F)
- Storage: -25 to 70°C (-13 to 158°F)
Mounting
Horizontal DIN rail mounting is recommended. Vertical DIN rail mounting requires heat sink (model HS01, included) and circulating airis recommended.
Power
- Consumption: 1.5W typical, 2.5W max
- Range: 9 to 30VDC
Weight
0.48 lbs
Agency Approvals
- CSA certified per standard C22.2, No. 0-M91 and 142-M1987 (File No. LR42272)
- UL recognized per standard UL508 (File No.E99775)
- CE Conformance per EMC directive 89/336/EEC and low voltage 73/23/EEC
