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Digital ALMEMO® connectors

Product catalog summary

Overview: The document outlines the technical specifications and functionalities of ALMEMO® D7 and D6 digital measuring connectors, which are designed for various temperature sensors such as thermocouples, Pt100, Pt1000, and NTC sensors. These connectors are compatible with ALMEMO® V7 measuring instruments to ensure precise temperature measurements.

1. ALMEMO® D7 Measuring Connector for Thermocouples:

Compatible with thermocouple types K, N, T, J, R, S, B, E.
Features galvanic isolation and an integrated A/D converter for accurate measurements.
Operates with a fast conversion rate, suitable for dynamic temperature changes.
Ensures high accuracy through multi-point calibration and compliance with DIN IEC 584 standards.
Measuring ranges vary by thermocouple type, with resolutions of 0.1 K or 0.01 K for specific ranges.

2. ALMEMO® D7 Measuring Connector for Pt100/Pt1000 Sensors:

Provides high-resolution measurements (0.01 K) up to 850 °C.
Linearization complies with DIN IEC 751 standards.
Allows for end-to-end calibration with multi-point adjustment for increased accuracy.
Operates independently with its own A/D converter, unaffected by the number of connectors.

3. ALMEMO® D6 Measuring Connector for Pt100 Sensors:

Designed for Pt100 sensors with a measuring range up to 400 °C.
Offers a resolution of 0.01 K and uses its own refresh rate for data scanning.
Ensures accuracy through calculated linearization and multi-point calibration.

4. ALMEMO® D7 Precision Measuring Connector for Pt100 Sensors:

Acts as a reference sensor with a resolution of 0.001 K across a wide range.
Supports high-precision applications with calculated linearization and multi-point calibration.
Suitable for ALMEMO® V7 instruments, providing enhanced precision.

5. ALMEMO® D6 Measuring Connector for NTC Sensors:

Utilizes Galway Steinhart coefficients for linearization, achieving high resolution (0.001 K).
Accuracy is determined by the NTC sensor and the connector, independent of extension cables.
Calibration involves multi-point adjustment for improved accuracy.

Conclusion: The ALMEMO® D7 and D6 connectors offer versatile and precise solutions for temperature measurement across various sensor types, ensuring high accuracy and reliability through advanced calibration and linearization techniques.

Specifications:

LMEMO® Device: Operates with a sensor supply voltage and a current consumption of approximately 4 mA. It offers high precision with a resolution of 0.001 K across a measuring range of -20 to +65 °C, utilizing Galway Steinhart coefficients for linearization.
ALMEMO® D6: Suitable for potentiometric sensors, it features an integrated A/D converter, ensuring accuracy independent of the display device. It supports high resolutions up to 200,000 digits or fast conversion rates.
ALMEMO® D7: Designed for bridge differential mV, DC voltage, and DC current measurements. It supports high precision or fast conversion rates, with resolutions up to 200,000 digits for various sensor types.

Procedures and Usage:

For ALMEMO® V6 and V7 instruments, customer-specific NTC sensors can be connected after configuring Steinhart-Hart coefficients.
The D7 connector allows for end-to-end calibration of the measuring chain, with the measuring rate determined by the integrated A/D converter.
Users can configure the preferred measurement settings directly on the ALMEMO® V7 device.

Technical Data:

Potentiometer: Input range of -2 to +2 V, with a reference voltage of 2 V and system accuracy of 0.02% ±2 digits.
Bridge Differential: Utilizes a full bridge with a 4-conductor circuit, powered by a 5 V supply, with system accuracy of 0.02% +2 digits.
DC Measurements: Offers high resolution up to 0.001 mV / 0.1 μA, with system accuracy of 0.02% +2 digits.

Revisions and Updates: The document notes that technical changes may be made, with the latest revision dated 11/2025.

Voltage Measurement:

Two measuring channels for voltage and frequency.
Measuring ranges: 25 VRMS AC with 0.01 V resolution and 400 VRMS AC with 0.1 V resolution.
Overload capacities: ±60 VRMS for 25 VRMS and ±400 VRMS for 400 VRMS.
Input resistances: 1 MOhm for 25 VRMS and 4 MOhm for 400 VRMS.
Order numbers: ZED730AB3 and ZED730AB5.

Current Measurement:

Two measuring channels for current and frequency.
Measuring ranges: 1.8 ARMS AC with 0.001 A resolution and 10 ARMS AC with 0.01 A resolution.
Overload capacities: ±4 ARMS for 1.8 ARMS and ±20 ARMS for 10 ARMS.
Input resistances: 100 mOhm for 1.8 ARMS and 8 mOhm for 10 ARMS.
Order numbers: ZED731AB1 and ZED731AB3.
Extended range up to 20 ARMS without specification, with continuous operation up to 10 ARMS. For currents exceeding 10 ARMS, the maximum measuring period is 10 minutes, followed by a cooling period.

Power Measurement:

Five measuring channels for voltage, current, effective power, frequency, and performance factor cosφ.
Measuring ranges: 400 VRMS AC for voltage, 1.8 ARMS AC and 10 ARMS AC for current, 720 W and 8 kW for power.
Resolution: 1 W for 720 W and 0.01 kW for 8 kW.
Order numbers: ZED737AB51 and ZED737AB53.
Extended range up to 20 ARMS without specification, with continuous operation up to 10 ARMS. For currents exceeding 10 ARMS, the maximum measuring period is 10 minutes, followed by a cooling period.

Technical Features:

Digital ALMEMO® D6 measuring module for acquiring true RMS value of sinusoidal AC signals.
Sampling rate of 1000 mops.
Overvoltage proof measuring input, galvanically isolated up to 6 kV.
Compatible with ALMEMO® V6 / V7 measuring instruments.

Additional Information:

Includes touch-proof connecting cable and permanently connected ALMEMO® connection cable to the D6 plug.
Technical changes may be made without notice.

Catalog excerpts

Digital ALMEMO® D7 measuring connector for thermocouple sensors of type K, N, T, J, R, S, B, E Measure dynamic temperature changes with up to 100 measurement operations per second. One single connector for different thermocouple types (programmable). Optimal linearization accuracy of the thermocouple characteristic by calculation methods as per the DIN IEC 584. Increased accuracy thanks to multi-point adjustment of the thermocouple sensor during calibration. For current measuring instruments ALMEMO® V7, ALMEMO® 202-S, 204, 104, 710, 510, 809. Technical data and functions • The digital ALMEMO® D7 measuring connector for thermocouples can be used for a variety of thermocouple types. Once connected, the thermocouple type is programmed via the ALMEMO® V7 measuring instrument. • The range for thermocouple type E. For use at lowest temperatures. • The thermocouple is connected via 2 screw terminals integrated in the measuring connector. Every measuring connector has an integrated temperature sensor directly in the screw terminals for measurement and automatic compensation of the cold junction temperature. • The input of the ALMEMO® D7 measuring connector is galvanically isolated from the ALMEMO® V7 measuring instrument. Therefore the connected thermocouple sensor is galvanically isolated from the other connected ALMEMO® sensors as well. • The digital ALMEMO® D7 measuring connector operates with its own integrated A/D converter. The linearization of the thermocouple characteristic is calculated using method in compliance with DIN IEC 584 (not an approximation). • For measuring dynamic temperature changes, the ALMEMO® D7 measuring connector operates at a fast conversion rate. The measuring rate is determined exclusively by the integrated A/D converter. • On the ALMEMO® V7 measuring instrument all D7 measuring connectors operate in parallel - each at its own measuring rate. The measuring instrument's very short scan cycle is determined by the measuring rates of the d7 measuring connectors - nearly irrespective of their number. The ALMEMO® V7 measuring instrument saves the measured values; the measuring software WinControl displays them graphically. • The overall accuracy of the measuring operation is unaffected by the presence of an ALMEMO® V7 display device / data logger. In case the measuring chain - consisting of a thermocouple sensor and the connected ALMEMO® D7 measuring connector - is calibrated, the measuring chain can be connected to any ALMEMO® V7 measuring device without any additional measuring uncertainties. • At constant ambient conditions, an increased system accuracy is achieved by calibrating the thermocouple sensor using multipoint adjustment. • To designate a sensor it is possible to program comments with up to 20 characters. 11/2025 • We reserve the right to make technical changes. Technial data Sensor type: Measuring input: Measuring ranges: Conversion rate: galvanically isolated, dielectric strength 50 V 0.1 K* respectively 0.01 K for measuring range K2 / N2 2.5*, 10, 50, 100 mops calculation method (not an approximation) System accuracy at conversion rate 10 mops: type K, K2, N, N2, J, T ±0.2 K ±0.02 % of measured value type E ±0.1 K ±0.02 % of measured value type R, S, B ±0.8 K ±0.02 % of measured value Cold junction compensation sensor: NTC 10 K at 25 °C Cold junction compensation effective in the range -10 °C to +60 °C: -30 °C to +100 °C Supply voltage: 6, 9, 12 V from ALMEMO® device Current consumption: approx. 5 mA Environmental conditions see general technical specifications * Factory setting. The desired measuring range can be programmed on the ALMEMO® V7 device. ALMEMO® D7 measuring connector for thermocouples. Fast measuring rate. Integrated galvanic isolation. ZTD700FS

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Input connectors for Pt100Digital ALMEMO® D7 measuring connector for Pt100 / Pt1000 temperature sensorHigh-level resolution of 0.01 K across the entire measuring range up to 850 °C Linearization of the Pt100 / Pt1000 characteristic calculated Calibration with greater accuracy by subjecting the temperature sensor to multi-point adjustment Only for latest ALMEMO® V7 measuring instruments, AlMEMO® 202-S, 204, 104, 710, 510, 809. The new ALMEMO® D7 measuring connector provides even greater precision! • The digital ALMEMO® D7 measuring connector uses its own integrated A/D converter. It provides a...

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Input connectors for Pt100Digital ALMEMO® D6 measuring connector for Pt100 temperature sensorDigital temperature sensors now also for ALMEMO® V6 measuring instruments, e.g. ALMEMO® 5690, 2690, 2590 Resolution of 0.01 K across the entire measuring range up to 400 °C Linearization of the Pt100 characteristic calculatedCalibration with greater accuracy by subjecting the temperature sensor to multi-point adjustment The new ALMEMO® D6 measuring connector provides even greater precision! 11/2025 • We reserve the right to make technical changes. Technical data and functions • The digital ALMEMO® D6...

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Input connectors for Pt100Digital ALMEMO® D7 Precision measuring connector for Pt100 temperature sensor, resolution 0.001 KDigital precision measuring connector with highest resolution of 0.001 K across the entire measuring range up to 850 °C Linearization of the Pt100 characteristic calculatedCalibration with greater accuracy by subjecting the temperature sensor to multi-point adjustment For ALMEMO® V7 measuring instruments, ALMEMO® 202-S, 204, 104, 710, 510, 809. The new ALMEMO® D7 measuring connector provides even greater precision! Digital precision resistance sensor Pt100 FPD723L0250A3D...

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The self-heating must be included in the measurement uncertainty: If the self-heating is NOT known for the sensor design at hand, a lump sum must be charged. Example: For a sufficiently long sheath element, an amount of 17 mK is recommended. In comparison: For the Ahlborn precision probe FPA923/FPD723 the self-heating was determined and is included in the measurement uncertainty with typ. 2 mK. The hysteresis must be described in addition to the measurement uncertainty: If the hysteresis is not determined, a lump sum of up to 0.2 % of the span is recommended in international regulations. Example:...

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Digital ALMEMO® connectors

Digital ALMEMO® connectors

Catalog excerpts

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