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        G128-0001
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        • Lifecycle status

          Discontinued / Obsolete by OEM
          Apter Power offers G128-0001 quotations, exact data sheets, and thermocouple-range matching assistance.

        G128-0001

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        1001 reviews ｜ Need a Specific Revision?
        Eurotherm G128-0001 is a dual-setpoint thermocouple limit alarm that compares one temperature input with two thresholds and switches a separate SPDT relay at each setpoint.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
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        Technical specifications for G128-0001

        • Manufacturer:
          Eurotherm
        • Part Number:
          G128-0001
        • Product Family:
          Eurotherm
        • Product Type:
          Dual-Setpoint Thermocouple Input Limit Alarm
        • Stock:
          1
        • Input type:
          Thermocouple
        • Alarm setpoints:
          2 independently adjustable setpoints
        • Relay outputs:
          2 SPDT relays, one per setpoint
        • DC supply range:
          9–30 V DC
        • Typical power consumption:
          1.5 W
        • Maximum power consumption:
          2.5 W
        • Relay rating at 120 V AC:
          5 A resistive
        • Relay rating at 240 V AC:
          2 A resistive
        • Relay rating at 28 V DC:
          5 A resistive
        • Circuit isolation:
          1800 V DC between contacts, input, and power
        • Setpoint range:
          Adjustable over 100% of the selected span
        • Deadband adjustment:
          0.25–5% of span
        • Response time:
          Less than 250 ms
        • Operating temperature:
          0 to 55 °C
        • Storage temperature:
          −15 to 70 °C
        • Operating humidity:
          15–95% at 45 °C, non-condensing
        • Humidity soak:
          90% for 24 h at 65 °C, non-condensing
        • Tariff Code:
          9032899090
        • Country of origin:
          USA
        • 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 & Setpoints Relay Outputs Isolation & Power Ambient Limits

        Features:

        • Compares one thermocouple input with two independently adjustable alarm setpoints.
        • Provides one SPDT relay output for each setpoint.
        • Accepts a 9–30 V DC isolated supply with 2.5 W maximum consumption.
        • Operates from 0 to 55 °C and stores from −15 to 70 °C.
        Eurotherm G128-0001 uses one temperature input to operate two independent limit decisions.

        The two SPDT relays let separate external circuits respond to the lower and upper configured thresholds.

        Adjustable deadband stabilizes each output when the measured signal remains near its switching point.

        The Eurotherm G128-0001 Dual-Setpoint Thermocouple Input Limit Alarm may still be available through Apter Power after OEM discontinuation.
        Eurotherm G128-0001 Dual-Setpoint Thermocouple Input Limit Alarm Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.

        How one sensor drives two alarm decisions

        • Thermocouple input: One thermocouple signal enters the alarm module.
        • First setpoint: Setpoint 1 controls the first SPDT relay.
        • Second setpoint: Setpoint 2 controls the second SPDT relay.
        • Deadband: Each switching decision can be stabilized near its threshold.

        Contact capabilities for external circuits

        • At 120 V AC: Each relay is rated 5 A resistive.
        • At 240 V AC: Each relay is rated 2 A resistive.
        • At 28 V DC: Each relay is rated 5 A resistive.
        • Contact form: Two SPDT relays provide changeover outputs.

        Electrical separation and supply loading

        • Supply window: The module accepts 9–30 V DC.
        • Typical load: Power consumption is 1.5 W under typical conditions.
        • Maximum load: The documented maximum is 2.5 W.
        • Isolation: Contacts, input, and power are separated by 1800 V DC isolation.

        Environmental limits for the installed alarm

        • Operating range: Maintain the module between 0 and 55 °C.
        • Storage range: Unpowered storage is permitted from −15 to 70 °C.
        • Operating humidity: The limit is 15–95% at 45 °C without condensation.
        • Humidity soak: The module withstands 90% for 24 h at 65 °C without condensation.
        Description
        Eurotherm uses G128-0001 as an Ultra SlimPak dual-setpoint thermocouple limit alarm. The module receives one temperature signal, compares it with two independently selected limits, and passes the two resulting alarm decisions to separate external circuits.

        After the thermocouple signal enters G128-0001, both comparator paths use the same measured value but apply different setpoints. Each path then operates its own changeover relay, allowing one sensor to drive two distinct annunciation or interlock functions without electrically joining their field circuits.

        Configuration of G128-0001 links the selected thermocouple range to both setpoints, their relay actions, and their deadband. These settings must remain associated because changing the input span changes where both alarm thresholds sit within the measured temperature range.
        Alternative Names
        Eurotherm G128 0001 G1280001 G128-0001 Dual Setpoint Alarm Eurotherm Ultra SlimPak G128-0001 G128 00O1 G128-OOO1 Eurotherm G128-0001 Thermocouple Alarm G128 0001 Limit Alarm
        Technical notes
        Eurotherm G128-0001 requires the thermocouple type, range, setpoint positions, relay action, and deadband to be recorded together before replacement or recommissioning.
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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.
        VIEW ALL FAQS
        Why can the two relays on Eurotherm G128-0001 switch at different temperatures?
        Eurotherm G128-0001 has two independently adjustable setpoints, so each SPDT relay responds to its own threshold while both use the same thermocouple input.
        How can relay chatter be reduced on Eurotherm G128-0001?
        Adjust the deadband of Eurotherm G128-0001 within the documented 0.25–5% span range so small input changes near the setpoint do not repeatedly operate the relay.
        What control supply is required by Eurotherm G128-0001?
        Eurotherm G128-0001 accepts 9–30 V DC and can consume as much as 2.5 W, so the source must remain inside that voltage range under load.
        Can Eurotherm G128-0001 switch a 240 V AC load directly?
        The SPDT contacts of Eurotherm G128-0001 are rated for a 2 A resistive load at 240 V AC; inductive loads require separate consideration and suppression.
        Which temperature limit applies to Eurotherm G128-0001 in operation?
        Eurotherm G128-0001 is documented for operation from 0 to 55 °C, while the wider −15 to 70 °C range applies only to storage.
        What should be recorded before changing Eurotherm G128-0001?
        Record the thermocouple type, selected span, both setpoints, deadband settings, and relay action of Eurotherm G128-0001 before disturbing the installed wiring or controls.

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