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HW48 Data and Signal Surge Protection

Brand: MTL Instruments
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The HW48 device safeguards Honeywell STT350 intelligent transmitters against surges and transients from field cabling.

This Honeywell tested and approved unit fits onto the side of the STT350 transmitter inside the standard ‘flameproof’- Ex d enclosure housing giving a 10kA level of protection.

Installation and earthing is simple so even existing installations can easily be upgraded by retrofitting the HW48.

Analogue and Smart local current meters can be wired into the transmitter and will benefit from protection provided by the HW48.
Features
  • Built-in Reliability - Solid State
  • Simple Installation and Wiring -Customized Mounting
  • Retrofittable - Easily Fitted to Transmitters in Existing Installations
  • Honeywell Tested and Approved for Use with STT350 Transmitters
  • Analogue and Smart Meter Compatible
  • 10 Year Product Warranty

1 - 1 of 1 Part Numbers
HW48
HW48
Process Transmitter Surge Protection Device for Honeywell STT350 Transmitters
1 - 1 of 1 Part Numbers

Specifications

Brand

Maximum Surge Current

  • 10 kA peak current (8/20 μs waveform)
  • 10 kV peak voltage (1.2/50 μs waveform)

Leakage Current

  • < 2 μA at 32 Vdc
  • < 10 μA at Max. working voltage, over full temperature range

Working Voltage

  • 48 V dc Max.

Signal Level

  • 4/20 mA dc plus DE communications

Series Resistance

  • 18 ohms/line (36 ohms loop)

Ambient Temperature Limits

  • -40° F to +176° F (-40° C to +80° C) working
  • -40° F to +212° F (-40° C to +100° C) storage

Humidity

  • 5 % to 95 % RH (non-condensing)

Electrical Connections

  • 3-Way terminal block (+ve, E, -ve)
  • 1.5 mm*2 Max. Flying lead earth connection

Weight

  • 1.7 oz. (48 g) excluding transmitter housing

Electrical Safety

  • For hazardous-area use
  • Intrinsic safety: Non-energy storing apparatus (< 1.2 V, < 0.1A, < 20 μJ, < 25 mW)
  • Ceq=0, Leq=0, the device can be connected into any IS loop with input power < 2W
  • Flameproof/Explosionproof: No effect on existing Ex d approval when fitted into an STT350 transmitter in an approved housing

Documentation

Product Information

User Guide

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