Description
The G438 is a DIN rail mount, potentiometer input signal condi-
tioner with 1800VDC isolation between input, output and power.
The input provides a constant voltage and is designed to accept
any three-wire potentiometer from 100 Ohms to 100K Ohms. The
field configurable output is switch selectable providing either a 0-
5V, 0-10V, 0-1mA, 0-20mA or 4-20mA DC signal.
Wide ranging precision zero and span pots used in conjunction
with DIP switches allow 80% adjustablity of offset and gain to
transmit a fullscale output from any 20% portion of the potenti-
ometer input.
Application
The G438 is useful in transmitting process control setpoints to
remote PID controllers or interfacing position sensors to data
acquisition and control systems. The high density DIN rail
mounting offers an extremely compact solution for saving valu-
able panel space.
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 a case such as this, the
G438 can easily be adjusted with the zero and span to provide a
fullscale output signal (e.g. 4-20mA) representing 0-25% or even
50-75% of the potentiometer input.
ULTRA SLIMPAK®
G438-0001
Potentiometer Input Field
Configurable Isolator
Provides an Isolated, Linearized DC Output
in Proportion to a Potentiometer Input
Potentiometers from 100 Ohms to 100K Ohms
Wide Ranging Zero & Span Adjustability
Field Configurable Output Ranges: 0-5V, 0-10V,
0-1mA, 0-20mA and 4-20mA
G438-0001
Ultra Slim Housing for High Density Installations
Flexible Power Supply Accepts 9 to 30 VDC
ASIC Technology for Enhanced Reliability
RoHS Compliant
Configuration
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.
WARNING: Do not change switch settings with power applied.
Severe damage will result!
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Table 1: G438 Input Ranges Table 2: G438 Output Ranges
Calibration
Note: To maximize thermal stability, final calibration should be
performed in the operating installation, allowing approximately 1
to 2 hours for warm up and thermal equilibrium of the system.
1. With power disconnected, set the output and input switch
selectors (SW1 and SW2) to the desired ranges (Tables 1 and 2).
2. Connect the input and output as shown in Figure 1. Connect the
output to the device (or a load approximately equivalent to the
device) and apply power.
3. Set the input potentiometer to the desired minimum and adjust
the zero potentiometer for the desired minimum output.
4. Set the input potentiometer to the desired maximum and adjust
the span potentiometer for the desired maximum output.
5. Repeat steps 3 and 4, if necessary, for best accuracy.
Note: All Ultra SlimPak modules are designed to operate in ambient
temperatures from 0 to 55
°
C when mounted on a horizontal DIN rail. If
five or more modules are mounted on a vertical rail, circulating air or
model HS01 Heat Sink is recommended. Refer to HS01 Technical
Bulletin (#721-0549-00) or contact the factory for assistance.
Figure 3: Mounting Multiple Modules
Figure 1: Wiring Diagram for G438 Figure 2: Potentiometer Wiring for G438
Specifications
Potentiometer Input:
Resistance (End to End):
100 Ohms up to 100K Ohms
Input Impedance: >1M Ohms
Input Excitation: 500mV, 5mA max. 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: 0-5V, 0-10V
Source Impedance: <10 Ohms
Drive: 10mA, max. (1K Ohms min. @ 10V)
Current:
Output: 0-1mA, 0-20mA, 4-20mA
Source 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.)
Accuracy (Including Linearity, Hysteresis):
±0.1% maximum at 25°C.
Stability:
Temperature: <±0.05%/°C max. of full
scale range.
Response Time (10 to 90%):
<200mSec., typical.
Common Mode Rejection:
DC to 60Hz: 120dB
Isolation:
1800VDC between line pwr & 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)
Ordering Information
Models & Accessories
Specify:
1. Model: G438-0001
2. Accessories: (see Accessories)
3. Optional Custom Factory Calibration: specify C620 with desired
input and output range.
Accessories
SlimPak “G” series modules will mount on standard TS32 (model MD02) or TS35
(model MD03) DIN rail. In addition, the following accessories are available:
HS01 Heat Sink
MD03 TS35 x 7.5 DIN rail
WV905 24VDC Power Supply (0.5 Amp)
H910 24VDC Power Supply (1 Amp)
H915 24VDC Power Supply (2.3 Amp)
MB03 End Bracket for MD03
C664 I/O Descriptive Tag
Dimensions
Eurotherm, Inc
741-F Miller Drive
Leesburg, VA 20175-8993
703-443-0000
info@eurotherm.com or www.eurotherm.com/actionio
Factory Assistance
For additional information on calibration, operation and installation
contact our Technical Services Group:
703-669-1318
721-0650-00-F 02/09 Copyright© Eurotherm, Inc 2009
Action Instruments Barber-Colman Chessell Continental Eurotherm
actionsupport@eurotherm.com
Mounting:
Horizontal DIN rail mounting is
recommended.
Vertical DIN rail mounting requires
heatsink (model HS01, included) and
circulating air is recommended.
Power:
Consumption: 1.5W typical, 2.5W max
Range: 9 to 30VDC
Weight:
0.48 lbs
Agency Approvals:
UL recognized per standard UL508
(File No.E99775)
CE Conformance per EMC directive 89/336/EEC
and low voltage 73/23/EEC
RoHS Compliant
Printed on recycled pape
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