Levelflex FMP53
Endress+Hauser 89
Overvoltage protection
Accessories Description
Overvoltage protection for
2-wire devices
OVP10 (1-channel)
OVP20 (2-channel)
A0021734
Technical data
• Resistance per channel: 2 × 0.5 Ω
max
• Threshold DC voltage: 400 to 700 V
• Threshold surge voltage: < 800 V
• Capacitance at 1 MHz: < 1.5 pF
• Nominal leakage current (8/20 μs): 10 kA
• Suitable for conductor cross-sections: 0.2 to 2.5 mm
2
(24 to 14 AWG)
Ordered with the device
Ideally, the overvoltage protection module should be ordered directly with the device. See product structure, feature
610 "Accessory mounted", option NA "Overvoltage protection". Separate order necessary only if retrofitting.
Order numbers for retrofitting
• For 1-channel devices (feature 020, option A):
OVP10: 71128617
• For 2-channel devices (feature 020, options B, C, E or G)
OVP20: 71128619
Housing cover for retrofitting
In order to keep the necessary safety distances when using the surge arrester module, the housing cover also needs
to be replaced when the device is retrofitted. Depending on the housing type, the suitable cover can be ordered
using the following material number:
• Housing GT18: cover 71185516
• Housing GT19: cover 71185518
• Housing GT20: cover 71185517
Restrictions in case of retrofitting
The use of the OVP module may be restricted depending on the transmitter approval. A device may only be
retrofitted with the OVP module if the option NA (overvoltage protection) is listed under Optional specifications in
the Safety Instructions (XA) associated with the device.
For details, see SD01090F.
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