PD140 Lightning Protection Device PD140 Lightning-proof Protection Device Features •Suitable for 420mA current loop and RS485 signal channel •Self-resetting; •Effective to prevent transmitter damage from lightning, inductive switch and statis discharge; •Common mode (wire & wire) protection and differential mode (wire & earth) protection; •Response quickly; •Housing protection IP65 Introduction PD140 lightning-proof protection device is the new version which our company developed especially for transmitter outdoor application. Lightning strike is the main failure reason for level transmitter broken in outdoor measurement. PD140 device could reduce transmitter damage probability through inner protection components. It is effective to protect transmitter working normally and help customers to reduce losses. Specification •Max. flow of RS485 signal interface: •Max. flow of 420mA channel: •Operation temperature: •Limited voltage: (420mA channel2-wire to the earth 28V RS4852-wire to the earth -7V12V •Max. working current: 420mA channel<40mA •Installation: 3 bolts fixing / fixed by lead rail Outline Construction and Electric Connection input side output side (connect ing to transmit ter) http://www.microsensor.cn Address: No.,18, Yingda Rd, Baoji 721006, Shaanxi, China Tel: +86 917 3600755 /3600832

PD140 Lightning Protection Device Order Notes 1. Please install the protection device to transmitter’s protected side as close as possible; 2. In order to keep good protection class, please be sure the cable, which passes through the fixed conector, has diameter bweteen 510mm; 3. Please be sure the system earthing well. The cable between wiring terminal and earth wire is 2 lessthan 1m, and cable cross section area is no less than 4mm . The earthing resistor should be less than 4 Ohms. 4、The lightning protection device has the certain voltage drop. At 20mA and normal temprature 25℃, the voltage...