The DP302-M and -R are low-cost 3-1/2 digit (±1999
count) temperature indicators for use with platinum
100 O RTD’s with alpha of 0.00385. They are complete
with 1 mA sensor excitation, sensor-break detection,
and platinum curve linearization. Resolution is 1° (-M)
or 0.1° (-R). Readout can be in °C or °F, as selected by
push-on jumpers. The electrical connection can be by
2-, 3-, or 4-wires. High accuracy is provided by positive
current feedback and matched, graded components.
STANDARD FEATURES
Mechanical features include a bright 14 mm (0.56")
display, a screw-terminal barrier strip for signal and
power, and a compact 1/8 DIN case that requires
less than 104 mm (4.1") behind the panel. Electrical
features include jumper selection of °C or °F, a
linearized recorder output of 1 or 10 mV per degree,
and 1 mA current excitation. The current source is
tied to the reference of the A/D converter for true
ratiometric operation and immunity to changes in
line voltage.
OPTIONS
Options are isolated 9 to 32 Vdc or 26 to 56 Vdc
power, a PCB edge connector for display control
and output of 4.7 Vdc and -4.7 Vdc power, and a
splash-proof lens cover which meets NEMA 4 (IP65)
requirements.
SPECIFICATIONS Input RTD Type: 100-platinum with alpha of 0.00385 Calibration: IEC 751 (IPTS-68) Configuration: 2-, 3- or 4-wire connection Polarity:Bipolar Zero: Adjustable ±20°C (±36°F) Zero Tempco: ±0.05 degree/degree (-M), ±0.01 degree/ degree (-R) Sensor-Wire Resistance Tempco Effect Per Conductor: 2-Wire: 20 mdeg/Ω/deg, up to 3.8 Ω 3-Wire: 50 µdeg/Ω/deg, up to 100 Ω 4-Wire: 5.0 µdeg/Ω/deg, up to 100 Ω Sensor-Excitation Current: 1 mA Sensor-Break Indication: Meter displays overrange Overvoltage Protection: 25 Vp
Noise Rejection NMR, SIG HI to SIG LO: 70 dB, 50/60 Hz CMR, ANA GND to POWER GND: 120 dB DC to 60 Hz CMV, ANA GND to ANA GND: 1500 Vp per HV test, 354 Vp per IEC spacing
Accuracy at 25°C Span Tempco: ±0.005% R/°C on all models plus ±0.05°C/°C for -RC from -200 to 130° C Celsius/Fahrenheit: Jumperselectable Full-Scale Step Response: 1 s Warmup to Rated Accuracy: 10 min
Analog Output (Linearized) Voltage: 1 mV/deg (-M); 10 mV/deg (-R) Calibration Error: Same as given under accuracy Current: 1 mA maximum Source Resistance: 68 Ω Analog-to-Digital Conversion Technique: Dual-slope, average value Signal Integration Period: 100 ms Read Rate: 2.5/s
Display Type: 7-segment, red LED Height: 14.2 mm (0.56") Symbols: -1.8.8.8 Decimal Points: XXXX (-M); XXX. X (-R) Overrange Indication: Three leastsignificant digits blank
Digital Inputs Level:TTL or 5V CMOS compatible
Power AC Voltages: 115 or 230 Vac, ±15% AC Frequency: 49 to 440 Hz DC Voltages: 9 to 32 Vdc, isolated to 300 Vp; 26 to 56 Vdc, isolated to 300 Vp Power Consumption: 3.7 W Output voltages: 4.7 Vdc and -4.7 Vdc ±5%, 10 mA max
Environmental Operating Temperature: 0 to 60°C Storage Temperature: -40 to 85°C Relative Humidity: 95% at 40°C (non-condensing)
Mechanical Bezel: 96 W x 48 H x 5.1 mm D (3.78 x 1.89 x 0.20") Depth Behind Bezel: 104 mm (4.09") Panel Cutout: 92 W x 45 mm H (3.62 x 1.77") Weight: 15 oz (425 g) Case Material: 94V-0 UL-rated polycarbonate
† All dollar amounts on this site are shown in US currency.
Part Number Builder
Option Descriptions
(1)
Model
Select DP302 for 3-1/2 digit (Pt100) RTD meters
(2)
Input Range
Select -MC for 1° resolution °C -200 to 820°C -MF for 1° resolution °F -328 to 1508°F -RC for 0.1° resolution °C -199.9 to 199.9°C -RF for 0.1° resolution °F -199.9 to 199.9°F
(3)
Power options
Select Nothing(leave field blank) for 115 Vac 50/60 Hz power -C1 for 230 Vac 50/60 Hz -C3C for Isolated 9 to 32 Vdc -C3E for Isolated 26 to 56 Vdc
(4)
Add-On Option
Select Nothing(leave field blank) for red LED display -G for Green LED display
NOTE: All combinations may not be valid, check spec sheet for valid part numbers.
