HW48

Specifi cation
All fi gures typical at 77°F (25°C) unless otherwise stated
Maximum surge current
10kA peak current (8/20μs waveform)
10kV peak voltage (1.2/50μs waveform)
Leakage current
< 2μA at 32Vdc
< 10μA at maximum working voltage, over full
temperature range
Working voltage
48V dc maximum
Signal level
4/20mA 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)
1.5mm2 maximum Flying lead earth connection
Weight
1.7 oz (48g) excluding transmitter housing
Dimensions
See fi gure 1
Electrical safety (for hazardous-area use)
Intrinsic safety: Non-energy storing apparatus (<1.2V,
<0.1A, <20μJ, <25mW), 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 fi tted into an STT350 transmitter in
an approved housing.


Notes
1) Slot for bonding wire when unit installed
2) Bonding lead with M3 ring tag attached
3) Recess for head of STT350 retaining screw