The TP48 surge protection device safeguards field-mounted process transmitters where it matters, right at the unit. After a simple installation (the TP48 screws into an unused conduit entry, with no additional modification), it provides high-level protection against surges and transients whilst normal operation remains unaffected. The TP48 resets itself automatically after each operation. The TP48 is available with screw threads to suit different transmitters, with explosion proof and intrinsically safe options for hazardous areas. Working voltage is 48V dc maximum with impulse ratings of 10kA peak current and 10kV peak voltage.

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• 1 Easy and direct mounting - simply screws into spare conduit entry

• 2 Intrinsically safe and flameproof (explosion proof) approved versions

• 3 Range of thread types available

• 4 Fieldbus compatible

• 5 Available in 2, 3 & 4 wire versions

• 6 10 Year 'No Fuss' Warranty

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MTL TP48-N OF SPECIFICATION
Maximum surge current
20kA peak current (8/20μs
waveform)
Leakage current
Less than 10μA 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”)

MTL TP48-N OF Weight
175g. (6.2oz.)

MTL TP48-N OF Dimensions
See figure 1

EMC compliance
To Generic Immunity Standards
BS EN 61326-1:2013 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 (explosionproof)
standards, and can be fitted
into a similarly approved housing.

Electrical Safety  MTL TP48-N
To BS EN 61643-21:2001 for surge protection device.