MI 3309 BT DeltaGT

PAT testers

The MI 3309 BT DeltaGT is both battery and mains powered multifunctional instrument intended to perform measurements for testing the electrical safety of portable electrical equipment. Integrated unique PRCD testing technology prevents tripping out of mains RCD during measurement. Due to dual power capability of MI 3309 it enables performing of differential leakage current test in spite of its lightweight portable design. Large graphical LCD with backlight, two PASS / FAIL LED indicators and HELP screens for each measurement make the handling of the instrument clear and simple. Up to 1500 test results with parameters can be stored in the internal memory of the instrument and then downloaded to the PC for further data handling and creation of test report. Lightweight design, pre-programmed and custom test sequences, optional barcoding, android keyboard application and RFID systems make the MI 3309 an ideal instrument for high volume professional safety testing of portable appliances.


Standards applied

Building LV Installation

  • IEC/EN 61557 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - series
  • IEC/EN 61557 Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC - Equipment for testing, measuring or monitoring of protective measures - relevant parts

Portable appliances safety

  • PAT Competences: Portable Appliances Safety Testing
  • EN 50699 Recurrent Test of Electrical Equipment
  • EN 50678 General procedure for verifying the effectiveness of the protective measures of electrical equipment after repair
  • AS / NZ 3760 In-service safety inspection and testing of electrical equipment
  • VDE 0404-1 Testing and measuring equipment for checking the electric safety of electric devices - Part 1: General requirements
  • VDE 0404-2 Testing and measuring equipment for checking the electric safety of electric devices - Part 2: testing equipment for tests after repair, change or in the case of repeat tests
  • VDE 0701 Inspection after repair, modification of electrical appliances - periodic
  • VDE 0702 Inspection on electrical appliances - general requirements for electrical safety
  • NEN 3140 Guidelines for safe working practices
  • IET COP 5th Ed., In-service Inspection and Testing of Electrical Equipment

Mobile Units Electrical Safety

  • eMOB Competences: Electrical LV Installations in Mobile Units Safety
  • IEC/EN/HD 60364-7-717 Low-voltage electrical installations: Requirements for special installations or locations – Supplies for Electrical Vehicles


Measuring functions

  • Functional and visual inspection;
  • Earth bond resistance;
  • Insulation resistance;
  • Insulation resistance of isolated accessible conductive parts;
  • Substitute leakage current;
  • Substitute leakage current of isolated accessible conductive parts;
  • Differential leakage current test;
  • Touch leakage test;
  • RCD and portable RCD testing, type (K, S);
  • Power test;
  • IEC cord polarity test;
  • Leakage and load currents with current clamp;
  • TRMS voltage meter;
  • Enhanced TRMS test.

Key features

  • Autosequencing: pre-programmable VDE compatible autosequences, up to 50 custom prepared autosequences and barcode autotests speed up testing and ensure that no tests are missed.
  • Dual powered: the instrument can operate from mains power or batteries.
  • PASS / FAIL: large green and red lights for additional PASS / FAIL indication placed at the sides of the LCD.
  • Fixed appliance testing: additional inputs and optional accessories enable testing of fixed installed appliances.
  • Scan and test: optional QR or barcoding system and PASS / FAIL QR or barcode label printing make retesting quick and simple.
  • RFID: support for advanced RFID identification system.
  • RCD testing: instrument enables testing of parameters of RCDs and portable RCDs.
  • Memory: large data flash memory allows to store up to 1500 test results and parameters for further downloading to PC.
  • Built-in charger & rechargeable batteries: instrument has a built-in charging circuit and comes complete with a set of rechargeable NiMH batteries.
  • Bluetooth: enables communication with PC, printers, and android devices.
  • Android application: enables advanced data management, use of smart phones camera for scanning QR and bar-code.
  • PC SW Metrel ES Manager: included in the standard set enables downloading, viewing, printing of test results, creation of user-defined AUTOSEQUENCE®s, and exporting of data to spreadsheet applications. Printing of PRO reports and professional export to excel is available with a PRO license.

Technical data

  • Dimensions: 140 x 80 x 230 mm
  • Mass (without accessories): 1.2 kg


Preventative maintenance

  • Safety of portable appliances


  • Appliances troubleshooting



Type File Language Version Release Notes Type Size View Download
Datasheet A 1433 PATLink Android en 1.0 24.11.2014 pdf 721.51 KB
Datasheet A 1434 aPAT Android en 1.0 26.01.2016 pdf 1.89 MB
Datasheet PC SW PATLink PRO en 1.0 27.03.2012 pdf 358.47 KB
Datasheet MI 3309 BT DeltaGT en 2021 22.06.2021 pdf 563.38 KB
Manual MI 3309 BT DeltaGT en 1.8.7 30.08.2022 20 752 183 pdf 2.46 MB Login
Manual MI 3309 BT DeltaPAT Multi-Language 2023 20.01.2023 zip 3.97 MB Login
DoC EU Declaration of Conformity Multi-Language 10.08.2021 QR code External link Unknown
PC Software SW 0201 PATLink PRO (64-bit) Multi-Language 2.0.6 30.11.2020 Readme zip 373.04 MB Login
PC Software SW 1201 Metrel Electrical Safety Manager (MESM) Multi-Language 02.03.2023 Readme zip 351.17 MB Login
PC Software SW 0201 PATLink PRO (32-bit) Multi-Language 1.9.33 02.12.2020 Readme zip 490.6 MB Login
Android SW 1204 RISK Calculator Android en 04.01.2021 QR code External link Unknown
USB driver USB driver Multi-Language 2.06.00 10.12.2018 Readme zip 2.99 MB Login