BASIC INFO
MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
Features of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
MTL TP48 range Safeguards electronic process transmitters against induced surges and transients from field cabling
• Protects 2, 3 and 4 wire transmitters
• Easy and direct mounting — screws into spare conduit entry
• Intrinsically safe and flameproof to CENELEC standards
• Parallel connection avoids introduction of any resistance into loop
• ATEX approved
• 10 year product warranty
Description of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
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, solidstate 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.
Installation can easily be carried out retrospectively to existing installations. The TP48 is screwed into any unused conduit entry on the transmitter case and flying leads are connected to the terminal block (+ve, -ve) and the internal earth stud. The 3 wire TP protects +ve, -ve and signal. The 4 wire TP48 protects +ve, -ve, signal +ve and -ve. The TPs operate without in any way affecting normal operation - passing acor dc signals without attenuation while diverting surge currents safely to earth and clamping output voltages to specific levels.
SPECIFICATION of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
Maximum surge current
20kA peak current (8/20µs waveform)
Leakage current of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
Less than 10µA at max. working
voltage
Working voltage of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
35V dc maximum
Bandwidth of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
1MHz
Resistance of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
No resistance introduced into loop
Ambient temperature limits of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
-40°C to +85°C (-40°F to +185°F) (working)
-40°C to +85°C (-40°F to +185°F) (storage)
Humidity of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
5% to 95% RH (non-condensing)
Electrical connections of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
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 of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
316 stainless steel suitable for harsh
environments
Threads of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
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”)
EMC compliance of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
To Generic Immunity Standards
BS EN 61326-1:2013 for industrial environments
Hazardous Area of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
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 of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
To BS EN 61643-21:2001 for surge protection devices
ORDERING INFORMATION of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
Model TP48
Nominal voltage Un 35V
Rated voltage (MCOV) Uc 58V
Nominal current In n/a
Nominal discharge current (8/20µs) i
sn 3kA
Max discharge current (8/20µs) Imax 20kA
Lightning impulse current (10/350µs) Iimp 2.5kA
Residual voltage @ isn Up 95V L-G 500V
Voltage protection level @ 1kV/µs Up <76V
Bandwidth fG 1MHz
Capacitance C 100pF
Series resistance R n/a
Operating temperature range -40°C to +60°C
Category tested A2, B2, C1, C2, C3, D1
Overstressed fault mode in=3kA 12kA
Impulse durability (8/20µs) 10kA
Degree of protection IP66
AC durability 1Arms, 5T
Service conditions 80kPa - 160kPa 5% - 95% RH
TO ORDER SPECIFY of MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
TP48-N Non-certified SPD - 1/2” NPT thread
TP48-I Non-certified SPD - 20mm ISO thread
TP48-G Non-certified SPD - G 1/2” (BSP 1/2 inch)
TP48-3-N Non-certified SPD - 1/2” NPT thread
TP48-3-I Non-certified SPD - 20mm ISO thread
TP48-3-G Non-certified SPD - G 1/2” BSP 1/2 inch
TP48-4-N Non-certified SPD - 1/2” NPT thread
TP48-4-I Non-certified SPD - 20mm ISO thread
TP48-4-G Non-certified SPD - G 1/2” BSP 1/2 inch
TP48-N-NDI Certified SPD - 1/2” NPT thread
TP48-I-NDI Certified SPD - 20mm ISO thread
TP48-G-NDI Certified SPD - G 1/2” (BSP 1/2 inch)
TP48-3-N-NDI Certified SPD - 1/2” NPT thread
TP48-3-I-NDI Certified SPD - 20mm ISO thread
TP48-3-G-NDI Certified SPD - 20mm ISO thread
TP48-4-N-NDI Certified SPD - 1/2” NPT thread
TP48-4-I-NDI Certified SPD - 20mm ISO thread
TP48-4-G-NDI Certified SPD - G 1/2” - BSP 1/2 inch
MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
MTL TP48-3-N-NDI Surge Protection Devices MTL TP48-3-N-NDI Safeguards Electronic Process Transmitters
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