54
Reference Manual
00809-0100-4825, Rev CB
Appendix A: Specifications and reference data
March 2014
Specifications and Reference Data
Enclosure ratings
The Universal (option code U) and Rosemount Connection (option code A) Heads are NEMA 4X,
IP66, and IP68. The Universal Head with
1
/2-in. NPT threads is CSA Enclosure Type 4X. The BUZ
head (option code B) is IP54.
A.1.3 Performance specifications
EMC (ElectroMagnetic Compatibility) NAMUR NE21 Standard
The Rosemount 248 meets the requirements for NAMUR NE21 Rating.
CE mark
The Rosemount 248 meets all requirements listed under IEC 61326: Amendment 1, 1998.
Power supply effect
Less than ±0.005% of span per volt
Vibration effect
The Rosemount 248 is tested to the following specifications with no effect on performance:
Stability
For RTD and thermocouple inputs, the transmitter will have a stability of ±0.1% of reading or 0.1
°C (whichever is greater) for twelve months.
Self calibration
The analog-to-digital measurement circuitry automatically self-calibrates for each temperature
update by comparing the dynamic measurement to extremely stable and accurate internal
reference elements.
Susceptibility Parameter Influence
ESD
6 kV contact discharge
8 kV air discharge
None
Radiated 80 – 1000 MHz at 10 V/m AM None
Burst 1 kV for I.O. None
Surge
0.5 kV line–line
1 kV line–ground
None
Conducted 150 kHz to 80 MHz at 10 V None
Frequency Vibration
10 to 60 Hz 0.21 mm displacement
60 to 2000 Hz 3 g peak acceleration
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