Customer service
DEHNsense EFD and DEHNwork App

The DEHNsense EFD can be worn either on the wrist (of the dominant hand - right or left-handed) or on the safety helmet. For this purpose, the strap is inserted into the slots provided in the adapter and the EFD is then inserted into the adapter.

Wearing on the wrist is recommended for use on switchgear. A flexible wrist strap is supplied for this purpose. In outdoor switchgear or when working on overhead line pylons, wearing the EFD on a hard hat is recommended.

If the DEHNsense EFD is not moved for more than approx. 5 minutes and does not detect an electric field, the device goes into an energy-saving ‘sleep mode’. However, as soon as the device is moved again, it performs a self-test and is active again.

The EFD should be charged before first use or when the battery indicator flashes orange. Charging is contactless via a QI-certified charger (not included in the scope of delivery). To charge, the base unit of the EFD must be placed directly on the charging cradle without the adapter housing. The battery indicator then lights up orange until the charging process is complete. No measurement or display of the electrical field takes place during the charging process. Once charging is complete, the battery indicator goes out. After charging, the EFD must be restarted using the button. To ensure the fastest possible charging process, a charging power of >= 10W is recommended.

Attention: The battery can be replaced, but only by DEHN.

For the DEHNsense EFD, regular periodic testing by the manufacturer is recommended. The intervals for the periodic test must be determined according to the operating conditions, e.g. frequency of use, stress due to ambient conditions, transport, etc. It is recommended that a repeat test is carried out at least every 6 years.

If the DEHNsense EFD is dirty, it must be cleaned with a lint-free, damp cloth (e.g. microfibre cloth) before and after use. Do not use cleaning agents or solvents to clean the device. The DEHNsense EFD must always be handled with care.

If the DEHNsense EFD is damaged or non-functional or not in proper condition, it must be withdrawn from use and sent to DEHN for repair without any intervention. Damaged devices must be excluded from reuse.

• iPhone 11 with iOS 18
• iPhone 14 with iOS 18
• Samsung Galaxy XCover 7 with Android 15
• Samsung Galaxy XCover 5 with Android 15
• Samsung S23 with Android 15
• Samsung S21 with Android 15
• Samsung A53 with Android 15
• Samsung A33 with Android 15

Make sure that the DEHNsense EFD is switched on (press the button for approx. three seconds) and Bluetooth is activated on your smartphone.

Use the + button on the ‘My devices’ page to add a new device and then select it. During the first pairing process with the EFD, the 6-digit PIN is requested via a pairing request. This can be found on the type plate of the EFD (back).

Once the two devices have been successfully paired, the DEHNsense EFD is active in the app and can be configured.

No! The EFD serves as an additional safety warning against tension. In any case, the 5 safety rules must always be applied!

After instruction, only a qualified electrician (EFK) or an electrotechnically instructed person (EuP).

No! The DEHNsense EFD is designed for AC voltages from 6 - 420 kV / 16.7 ... 60 Hz.

No! The EFD can only detect the electric field by pointing it freely towards the source of danger. Depending on the application, it can be worn on the helmet or wrist on clothing.

Yes, after it has been configured for the first time using the DEHNwork app.

Place the EFD on the charging cradle and wait until the orange charging symbol appears. The EFD is then fully charged again.

Steps for manually creating a QR code::

1. Call up a QR code generator, e.g. https://www.qrcode-generator.de
2. Log in to the DEHNwork back office portal https://www.dehn.de/en-US/backoffice-dehnwork/.
3. Select the system for which you want to create a QR code and select ‘Edit’. (Fig. Step 1)
4. Copy the ID from the URL to the clipboard (select it and press Ctrl+C). (Fig. Step 2)
5. Paste the copied ID into the QR code generator (Ctrl + V). (Fig. step 3)
6. The QR code is generated and can be downloaded.

In our web application (backoffice): 

https://www.dehn.de/en-US/backoffice-dehnwork/

1. Download DEHNwork app for iOS or Android
2. Login/registration in the DEHNwork app
3. Switch on DEHNsense EFD
4. Follow the instructions in the DEHNwork app
5. Done