Product Description

MTL Safety Barrier TP48-3-N-NDI

The TP48 range of surge protection devices uniquely provide a level of protection for 2, 3 and 4 wire field-mounted transmitters that is far in excess of the optional transient protection facilities available from the transmitter manufacturers - without involving any additional wiring, conduit modifications or other expensive extras.
The TP48 range protection network consists of high-power, solid state electronics and a gas-filled discharge tube capable of diverting 20kA impulses. The whole unit is encased in a 316 stainless steel housing, threaded for the common conduit entries used on process transmitters. Versions are available for 1/2” NPT, 20mm ISO, and G1/2” (BSP 1/2 inch) threaded entries.

SPECIFICATION

Maximum surge current:20kA peak current (8/20µs waveform)

Leakage current:Less than 1µA at max. working voltage

Working voltage:35V dc maximum

Bandwidth:1MHz

Resistance:No resistance introduced into loop

Ambient temperature limits:-40°C to +85°C(-40°F to +185°F) (working)；-40°C to +85°C(-40°F to +185°F) (storage)

Humidity:5% to 95% RH (non-condensing)

Electrical connections:TP48,3 flying leads (line1, line 2 & earth) ；TP48 3 Wire,4 flying leads (+ve, -ve, signal & earth)

；TP48 4 Wire,5 flying leads (+ve, -ve, signal +ve, signal -ve, earth)；Wire size: 32/0.2 (1.0mm2, 18 AWG) Lead length: 250mm (minimum)

Casing:316 stainless steel suitable for harsh environments

Threads:TP48-3-N & TP48-4-N - 1/2”NPT TP48-3-I & TP48-4-1 - 20mm ISO ) (M20 x 1.5)；TP48-3-G & TP48-4-G - G 1/2”(BSP 1/2”)

Weight:175g. (6.2oz.)

Dimensions:See figure 1

EMC compliance:To Generic Immunity Standards；BS EN 61326-1 for industrial environments

Hazardous Area:Ex ia IIC T4, Ceq=O, Leq=0; the unit can be connected without further,certification into any intrinsically safe loop with open circuit voltage <60V and input power <1.2W.Ex d IIC T4; the unit is apparatus approved to flameproof (explosion- proof) standards, and can be fitted into a similarly approved housing.
Electrical Safety:To BS EN 61643-21 for surge protection devices

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