TEMPERATURE TRANSMITTER DESCRIPTION
BAPI’s temperature transmitters incorporate a 1KΩ RTD sensor and an amplifier. These devices provide an accurate two-wire, 4 to 20mA output over a specified range. They are specifically designed for temperature sensing and transmission over long distances without degradation of the 4 to 20mA signal. BAPI also offers outputs of 0 to 5, 0 to 10, 1 to 5 and 2 to 10 Volts. All outputs can be ordered as field selectable by choosing the TXS option on the ordering grid.
Each temperature transmitter is first calibrated with simulated RTD resistances for the specified range. Then an RTD is connected to the transmitter and the output is verified at one temperature.
BAPI has verified over 200 temperature ranges for the transmitters. If we don’t offer the exact range you’re looking for, call your BAPI representative to see if we can create a special range.
Additionally, BAPI can provide matched RTD-based units. Matched (sensor-transmitter pair) units utilize the tight tolerance of Class A RTDs to improve overall accuracy. The matched unit is tested in an environmental chamber against an NIST traceable reference thermometer. Each matched pair is provided with a “Certificate of Calibration” which lists the tested and calculated offset values, and identifies the equipment, products and people involved in the calibration process. The overall accuracy of the matched pair now becomes a function of the transmitter linearity, RTD linearity and reference thermometer uncertainty.
Matched errors are ±((Span * Linearity Error) + (Reference Thermometer uncertainty)
Where linearity error = Square Root((Transmitter Linearity)2 + (RTD Linearity)2) = Square Root((0.125%)2 + (0.2%)2) = 0.234%
Examples:
BA/T1K(-30 to 130°F)
Span = 130 – (-30) = 160
Matched error = ±((160*0.234%) + (0.05°F)= ±0.42°F
BA/T1K(45 to 95°F)
Span = 95 – 45 = 50
Matched error = ±((50*0.234%) + (0.05°F)= ±0.17°F
These accuracies are for the entire range of the sensor, although the accuracies in the midband of the sensor will be tighter than those near the endpoints of the specified range. Other matching and/or certification options may be available, please contact your BAPI representative for details.
BAPI temperature transmitters come in a ruggedized package for all non-room configurations where moisture or condensation may be a problem. The potting material used to ruggedize the transmitters has high thermal conductivity to eliminate circuit overheating and low thermal expansion to minimize the stress on the circuit components. Due to the extremely low moisture absorption properties of the potting material, a ruggedized transmitter will remain operational even if temporarily immersed in water.
SPECIFICATIONS
T1K Transmitters
Sensor:
1000Ω Platinum RTD
Supply Voltage:
12 to 40 VDC
Output:
4 to 20 mA, 0 to 5V, 1 to 5V, 0 to 10V, 2 to 10V
Max. Loop Resistance:
850Ω at 24VDC
Span:
Min 16.6°C (30°F), Max 555°C (1000°F)
Zero:
Min -100°C (-148°F), Max 482°C (900°F)
Field Adjustments:
Each transmitter is calibrated to the specified temperature range that is ordered. Field adjustments are not available. If adjustments are needed, please contact your BAPI representative.
System Accuracy:
±0.065% of Span
Linearity:
±(0.125 x T-20ºC)/100
Operational Humidity:
0 to 95%, non-condensing
Output Current limits:
Less than 1mA and 22.35 ± 0.15 mA
Power Output Shift:
±0.009% of Span to 40VDC
Connections:
Four 22-gauge etched Teflon leads or terminal blocks
Operating Temperature:
| Transmitter: | -20 to 70°C |
| Sensor: | -65 to 105°C (standard) |
| -200 to 600°C (available) |
0-100 °F TEMPERATURE TRANSMITTER OUTPUT TABLE
| °F | °C | mA |
|---|---|---|
| 0 | -17.78 | 4.000 |
| 1 | -17.22 | 4.160 |
| 2 | -16.67 | 4.320 |
| 3 | -16.11 | 4.480 |
| 4 | -15.56 | 4.640 |
| 5 | -15.00 | 4.800 |
| 6 | -14.44 | 4.960 |
| 7 | -13.89 | 5.120 |
| 8 | -13.33 | 5.280 |
| 9 | -12.78 | 5.440 |
| 10 | -12.22 | 5.600 |
| 11 | -11.67 | 5.760 |
| 12 | -11.11 | 5.920 |
| 13 | -10.56 | 6.080 |
| 14 | -10.00 | 6.240 |
| 15 | -9.44 | 6.400 |
| 16 | -8.89 | 6.560 |
| 17 | -8.33 | 6.720 |
| 18 | -7.78 | 6.880 |
| 19 | -7.22 | 7.040 |
| 20 | -6.67 | 7.200 |
| 21 | -6.11 | 7.360 |
| 22 | -5.56 | 7.520 |
| 23 | -5.00 | 7.680 |
| 24 | -4.44 | 7.840 |
| 25 | -3.89 | 8.000 |
| 26 | -3.33 | 8.160 |
| 27 | -2.78 | 8.320 |
| 28 | -2.22 | 8.480 |
| 29 | -1.67 | 8.640 |
| 30 | -1.11 | 8.800 |
| 31 | -0.56 | 8.960 |
| 32 | 0.00 | 9.120 |
| 33 | 0.56 | 9.280 |
| 34 | 1.11 | 9.440 |
| 35 | 1.67 | 9.600 |
| 36 | 2.22 | 9.760 |
| 37 | 2.78 | 9.920 |
| 38 | 3.33 | 10.080 |
| 39 | 3.89 | 10.240 |
| 40 | 4.44 | 10.400 |
| 41 | 5.00 | 10.560 |
| 42 | 5.56 | 10.720 |
| 43 | 6.11 | 10.880 |
| 44 | 6.67 | 11.040 |
| 45 | 7.22 | 11.200 |
| 46 | 7.78 | 11.360 |
| 47 | 8.33 | 11.520 |
| 48 | 8.89 | 11.680 |
| 49 | 9.44 | 11.840 |
| °F | °C | mA |
|---|---|---|
| 50 | 10.00 | 12.000 |
| 51 | 10.56 | 12.160 |
| 52 | 11.11 | 12.320 |
| 53 | 11.67 | 12.480 |
| 54 | 12.22 | 12.640 |
| 55 | 12.78 | 12.800 |
| 56 | 13.33 | 12.960 |
| 57 | 13.89 | 13.120 |
| 58 | 14.44 | 13.280 |
| 59 | 15.00 | 13.440 |
| 60 | 15.56 | 13.600 |
| 61 | 16.11 | 13.760 |
| 62 | 16.67 | 13.920 |
| 63 | 17.22 | 14.080 |
| 64 | 17.78 | 14.240 |
| 65 | 18.33 | 14.400 |
| 66 | 18.89 | 14.560 |
| 67 | 19.44 | 14.720 |
| 68 | 20.00 | 14.880 |
| 69 | 20.56 | 15.040 |
| 70 | 21.11 | 15.200 |
| 71 | 21.67 | 15.360 |
| 72 | 22.22 | 15.520 |
| 73 | 22.78 | 15.680 |
| 74 | 23.33 | 15.840 |
| 75 | 23.89 | 16.000 |
| 76 | 24.44 | 16.160 |
| 77 | 25.00 | 16.320 |
| 78 | 25.56 | 16.480 |
| 79 | 26.11 | 16.640 |
| 80 | 26.67 | 16.800 |
| 81 | 27.22 | 16.960 |
| 82 | 27.78 | 17.120 |
| 83 | 28.33 | 17.280 |
| 84 | 28.89 | 17.440 |
| 85 | 29.44 | 17.600 |
| 86 | 30.00 | 17.760 |
| 87 | 30.56 | 17.920 |
| 88 | 31.11 | 18.080 |
| 89 | 31.67 | 18.240 |
| 90 | 32.22 | 18.400 |
| 91 | 32.78 | 18.560 |
| 92 | 33.33 | 18.720 |
| 93 | 33.89 | 18.880 |
| 94 | 34.44 | 19.040 |
| 95 | 35.00 | 19.200 |
| 96 | 35.56 | 19.360 |
| 97 | 36.11 | 19.520 |
| 98 | 36.67 | 19.680 |
| 99 | 37.22 | 19.840 |
| 100 | 37.78 | 20.000 |
