Temperature Transmitter Overview

TEMPERATURE TRANSMITTER DESCRIPTION

BAPI temperature transmitters incorporate a platinum 100 Ohm or 1k Ohm 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. The thermistor transmitter also comes in a 0 to 5 VDC or 0 to 10 VDC output.

The RTD transmitters (BA/T100 & BA/T1K) are 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. RTD transmitters have non-interacting zero and span potentiometers that are field adjustable.

BAPI has verified over 200 temperature ranges for the BA/T100 and BA/T1K transmitters. If we don’t currently 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, BA/T100M and BA/T1KM. 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

T100 and T1K Transmitters

Sensor:
100Ω or 1000Ω Platinum RTD

Supply Voltage:
7 to 40 VDC

Output:
4 to 20 mA

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)

(Unit is factory calibrated, field adjustment will void calibration warranty)

Zero:
+/- 10% • Span: +/- 10%

Accuracy:
±0.065% of Span (8 & 16mA outputs)

Linearity:
±0.125% of Span

Operational Humidity:
0 to 95%, non-condensing
0 to 100%, condensing for short intervals

Output Current limits:
Less than 1mA and 22.35 ± 0.15 mA

Power Output Shift:
±0.009% of Span 7 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)

°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