Rosemount 248, Reference Manual

Page: 52 / 80

Reference Manual
00809-0100-4825, Rev BB
August 2005
Rosemount 248
A-6
SENSOR
SPECIFICATIONS
Thermocouples –
IEC 584
Applicable to sensors offered in Table A-5 on page A-10
and Table A-6 on page A-12
Construction
Rosemount DIN plate and
1
/
2
-in. adapter style thermocouples are
manufactured from selected materials to meet IEC 584 Tolerance Class 1.
The junction of these wires is laser-welded to form a pure joint, maintaining
circuit integrity and ensuring highest accuracy.
Lead Wires
Internal – 18 SWG (16 AWG) solid wire (max), 19 SWG (18 AWG) solid wire
(min.). External extension leads, type J and K – 0.8 mm minimum stranded
wire, PTFE insulation. Color coded per IEC 584
Insulation Resistance
1000 megaohms minimum insulation resistance when measured at 500 V dc
at room temperature.
Table A-3. Characteristics of
DIN Plate and
1
/
2
-in. NPT
Adapter Style Thermocouples
Thermocouples – ASTM
E- 230
Applicable to sensors offered in Table A-7 on page A-14
Construction
Rosemount
1
/
2
-in. adapter style thermocouples are manufactured using ISA
Type J or K wire with special limits of error accuracy. The junction of these
wires is fusion-welded to form a pure joint, to maintain the integrity of the
circuit and to ensure the highest accuracy.
Lead Wires
Thermocouple, internal – 16 AWG solid wire (max), 18 AWG solid wire (min.).
External lead wire – 20 AWG wire, PTFE insulation. Color coded per ASTM
E-230
Insulation Resistance
100 megaohms minimum insulation resistance when measured at 100 V dc at
room temperature
Table A-4. Characteristics of
DIN Plate and
1
/
2
-in. NPT
Adapter Style Thermocouples
Characteristics Type J Type K
Alloys (wire color) Fe (+ black), CuNi (- white) NiCr (+ green), NiAl (- white)
Sheath Material 1.4541 (AISI 321) Inconel 600
Temp Range (°C) – 40 to 750 – 40 to 1000
Tolerance, DIN EN 60584-2 ±1.5 °C or ±0.4% of measured temp, whichever is greater
Characteristics Type J Type K
Alloys (wire color) Iron/Constantan (white/red) Chromel/Alumel (yellow/red)
Temp Range 0 to 760 °C (32 to 1400 °F) 0 to 1150°C (32 to 2102 °F)
Tolerance ±1.1 °C or ±0.4% of measured
temp, whichever is greater ± 1.1 °C or ±0.4% of measured
temp, whichever is greater
Sheath Material 304 SST Inconel