Signal SPD

Electronic devices are always threatened by power surges and transients caused by power failures or nearby lightning strikes.

Signal SPDsurge protection device is born to protect electronic devices in automatic control systems.

The SPDsurge protection devicecan provide surge protection for field equipments such as sensors, transmitters, flow meters, solenoid valves, thermocouples, thermal resistance, devices with RS485 or RS232 interface and for I/O interfaces such as Al, AO, Dl, DO, Tl, Pl in PLC, DCS, FGS, ESD control systems.

Signal data surge protector is widely used in petrochemical, gas, environmental protection and new energy industries.

Chenzhu also provides signal arresterequipment in intrinsical safety circuits that meet the same design and structural standards as intrinsic safety equipment, which requires certification and approval of them.

Intrinsic Safety 5V Signal SPD

Intrinsic Safety 24V Signal SPD

Signal SPD For 5V

Signal SPD For 24V

FAQ of Signal SPD

How do I choose a signal SPD?-

CHENZHUSPD for signal is mounted by DIN rail. It can be selected from informations below.

According to the signal type, we can get the information of the signal voltage, so as to determine Uc.

For example, normally,

AI，AO： 24V，

DI，DO： 24V，

RS485， TC：5V，

RS232：12V

RTD：5V.

Since SPD for signal is normally installed in range, operating current will go through SPD. If operating current is bigger than IL of SPD, SPD will be damaged. Normally IL will be big enough. For 3-wire, 4-wire carrier current transmitters and DO signals which have higher power consumption, IL need to be checked.

Select 2 wires, 3 wires, 4 wires accordingly.

Yes——select intrinsically safe SPD;

No——select non intrinsic safety SPD.

How to judge if SPD is functional?-

SPD protected the devices by discharging current to the ground. One-time strike will not damage SPD unless SPD is chosen incorrectly.

Power supply SPD is equipped with disconnector. If SPD fails, it will indicate through the indication window. SPD disconnector will not trip when it discharges lightning current. It is used to avoid fire hazardous caused by continuous fault current flowing through SPD when SPD is degraded.

For signal SPD, the risk of fire is small, so it is not required to set a disconnector. Normally, special lightning protection testing devices need to be used for off-line tests. Nowadays, with the technology development, the status indication function of signal SPD is becoming popular, so it’s also possible to judge by status indication.

As a SPD supplier, we can offer kinds of related products for sale, if you have needs, please contact us.

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