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    Discontinued / Obsolete by OEM
    Apter Power supports exact-part sourcing and analogue-channel review for this legacy GEM 80 multiplexer.

8108-4003

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Alstom 8108-4003 is a GEM 80 variable-scan analogue input multiplexer with selectable input, address and scan modes.
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Technical specifications for 8108-4003

  • Manufacturer:
    Alstom
  • Part Number:
    8108-4003
  • Product Family:
    Alstom
  • Product Type:
    Variable-Scan Analogue Input Multiplexer
  • Stock:
    1
  • Product role:
    Variable-scan analogue input multiplexer
  • Input selections:
    +10 V and +5 V
  • Address selection:
    Upper word or lower word
  • Scan modes:
    Forced scan or self scan
  • Weight:
    0.96 kg
  • Estimated shipping dimensions:
    6 x 24 x 23.7 cm
  • Tariff Code:
    8537101190
  • Country of origin:
    France
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Input Range Address Mode Loop Testing Applications

Features:

  • Variable analogue scan: multiplexes documented input channels.
  • Selectible input range: provides +10 V and +5 V positions.
  • Address and mode controls: retains word and scan selections.
The module combines analogue multiplexing with front-panel selections that directly affect range, addressing and scan behavior.

Channel wiring and switch positions must be captured together because either can change the value delivered to the controller.

A controlled loop test applies known inputs and compares controller readings before any analogue value is accepted for operation.

Apter Power can review the switch settings, channel map and controller scaling for Alstom 8108-4003 variable-scan analogue input multiplexer enquiries.
Alstom 8108-4003 Variable-Scan Analogue Input Multiplexer Manuals,Datasheets,Link Important Notice: No qualified exact-model English PDF is attached. Use the complete product model in every document request.
  • Input selection: +10 V or +5 V.
  • Channel map: retain each analogue terminal assignment.
  • Source signal: record normal loop values before isolation.
  • Scaling: preserve the controller engineering-unit conversion.
  • Address switch: upper word or lower word.
  • Scan switch: forced scan or self scan.
  • Controller record: retain the software address reference.
  • Receiving: compare switch hardware and front-panel markings.
  • Isolation: control connected analogue loops.
  • Known input: test each channel at defined values.
  • Controller check: compare raw and scaled readings.
  • Release: verify stable scan behavior and normal baselines.
  • GEM 80 analogue acquisition: variable-scan input multiplexing.
  • Legacy process measurement: service of installed voltage inputs.
  • Channel diagnosis: separation of loop, module and scaling faults.
  • Outage replacement: exact configuration restoration.
Description
8108-4003 is an Alstom GEM 80 variable-scan analogue input multiplexer. Its front controls provide +10 V or +5 V input selection, upper- or lower-word addressing, and forced-scan or self-scan operation.

A replacement for 8108-4003 must retain the channel wiring, input range, address-word selection, scan mode and controller software assumptions. An incorrect switch position can produce scaled or mapped values that appear valid while representing the wrong process signal.

Before removing 8108-4003, record every switch, channel terminal and normal analogue baseline. Restore the module with field loops controlled, compare each channel against a known input, and confirm controller scaling and scan behavior before measurements are used for control.
Technical notes
8108-4003 uses selectable +10 V or +5 V input range, upper- or lower-word addressing, and forced- or self-scan operation. A wrong front-panel selection can shift or rescale apparently credible values; record all switches and channel baselines, then stop commissioning if controller addressing or scaling does not reproduce the installed record.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Which settings must be recorded before ordering 8108-4003?
Record the +10 V or +5 V selection, upper- or lower-word address, forced- or self-scan mode and every channel assignment.
Why can 8108-4003 show a plausible but incorrect value?
A wrong range, address word, scan mode or controller scaling can still create a stable number that represents the wrong signal.
When should receiving hold 8108-4003?
Hold it if the order reference, front selectors, connector layout, board condition or module dimensions differ from the installed record.
What should be captured before removing 8108-4003?
Capture switch positions, terminals, loop identities, normal raw values, engineering-unit readings and the controller address map.
How should each channel of 8108-4003 be tested?
Apply controlled known inputs within the selected range and compare raw and scaled controller readings for every documented channel.
What releases 8108-4003 to service?
All channels must map correctly, track known inputs, reproduce normal baselines and scan stably without unexpected controller diagnostics.

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