Transcript
Thermistor Probes With M12 Connections
TH-21B-2252-1/4-0600-M12
TH-21 Series
M12 4-pin connector
D
Optional
U Maximum Continuous Use, 200°C (392°F) [Short Term Use to 250°C (482°F)] for Sensing End, 85°C (185°F) Maximum at Connector U Excellent Long Term Stability U Tolerance: ±0.2°C From 0 to 70°C (32 to 158°F) U Available in 2252, 3K, 5K and 10K Ω Resistances at 25°C (77°F) The TH-21 Series thermistor probes are constructed with the 55000 Series glass encapsulated thermistor elements which provide excellent stability and accuracy. With a maximum continuous temperature rating of -80 to 200°C (-112 to 392°F), and intermittent operation to 250°C (482°F), these thermistor sensors can be used in applications previously out of reach of epoxy coated thermistor sensors. The probes can be ordered in any length but we highly recommend a minimum immersion depth of 1.5". Short probes run the risk of error due to stem conduction effects.
Mounting thread
Probe length
Both models shown smaller than actual size. Probe length
TH-21A-2252-1/4-0600-M12
Specifications
Temperature Range: -50 to 200°C (-58 to 392°F) Thermistor Sensor: Refer to Table 1 on next page Operating Current: 12 micro-amps Insulation Resistance: 100 MΩ minimum at 100 Vdc at ambient temperature Response Time: Approximately 7 seconds (50%), 8 seconds (63.2%), 14 seconds (90%) in water flowing at 0.91 m (3') per second External Materials: 316L stainless steel sheath and housing except connector insert IP Rating: IP67 with mating connector installed
44.5 (1.75)
M12CM-T24SSPC-SF-2 cable, sold separately.
32 (1.25)
Probe diameter
28.5 (1.125)
M12CM-T24SSPC-RF-2 cable, sold separately. Optional extension cable. Dimensions: mm (in)
Resistance Vs. Temperature Characteristics
To determine the thermistor resistance at a specific temperature point, the following equation is used:
The Steinhart-Hart Equation has become the generally accepted method for specifying the resistance vs. temperature relationship for thermistors. The Steinhart-Hart equation for temperature as a function of resistance is as follows:
R = e (beta-(alpha/2))1/3 – ((beta+(alpha/2))1/3 where: alpha = ((A-(1/T))/C) beta = SQRT(((B/(3C))3)+(alpha2/4))
⁄T = A + B [Ln(R)] + C [Ln(R)]3
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The A, B and C constants for each of our thermistor selections can be found in Table 1. Using these constants with the above equations, you can determine the temperature of the thermistor based on its resistance, or determine a thermistors resistance at a particular temperature.
where: A, B and C are constants derived from three temperature test points. R = Thermistors resistance in Ω T = Temperature in Kelvins K (°C + 273.15) D-1
Table 1 Steinhart-Hart Constants Resistance Thermistor at 25°C 2252 2252 Ω 3K 3000 Ω 5K 5000 Ω 10K 10,000 Ω Probe TH-21A Length Probe
47.7 Ø16.7 (1.88) (0.66) 18.5 Ø16.7 Ø16.7 (0.73) (0.66) (0.66) Ø16.7 (0.66)
38.8 (1.53) 38.8(1.53) (1.53)
Probe Length
46.2
Probe Length Probe Probe Length Diameter Probe Probe Typical Diameter Probe Diameter Typical Diameter Typical Typical
18.2 (1.82) 46.2 (0.72) (1.82) 18.2 (1.82) 18.2 (0.72) (0.72) 18.2 (0.72)
G1/2 BSPP
(1.82) 1 ⁄2 NPT Mounting TH-21B Design 46.2Thread 46.2 Probe Length
10.6 (0.42)
C Constant 1.0389x10-7 1.0125x10-7 27 mm Hex -8 9.4346x10 8.6482x10-8
10.2 (0.40)
(1.59) 15 (0.59)
30 (1.18)
G1/4 BSPP
16 mm Hex 1/2" Hex
M8X1 Thread
TH-21F Design M10x1 Mounting Thread Probe Length
7/8" Hex M12X1 Typical
M12X1 Typical 7/8" Hex 7/8" Hex
7/8" Hex
3 38.8 TH-21C Design 38.8 Thread Probe Length⁄8 NPT Mounting
M8X1 Thread
(1.53)(1.53) 15.2 15.2 38.8 38.8 (0.60) (1.53) (0.60) (1.53) 15.2 15.2 (0.60) (0.60)
30 (1.18)
10.2 (0.40)
Wiring Diagram 1/2" Hex
2
1 4
3
M8X1 Thread
2
1/2" Hex
1
TH-21G Design
3
Probe Length
4
18.5 (0.73)
47.7 (1.88)
P
Single Element 3/8-18 NPTNPT 3/8-18
11/16"11/16" Hex Hex
3/8-18 NPT 3/8-18 NPT
11/16" Hex 11/16" Hex
2
1
TH-21D Design ⁄4 NPT Mounting Thread 1
35.3 (1.39)35.3
Probe Length
Probe Length
Probe Length Probe Length
13.4 (1.39) (0.53) 35.313.4 35.3 (0.53)(1.39) (1.39) 13.4 13.4 (0.53) (0.53)
3
1/4-18 NPT
1/4-18 NPT
Standard
1/4-18 NPT 1/4-18 NPT
Probe Length
4
18.5 (0.73)
2
1
47.7 (1.88)
4
Dual Element
9/16" Hex
9/16" Hex G1/2 BSPP
TH-21C-2252-1/4-0600-M12 TH-21D-2252-1/4-0600-M12 Metric Model No. TH-21A-2252-M6-0150-M12 TH-21E-2252-M6-0150-M12 TH-21F-2252-M6-0150-M12 TH-21G-2252-M6-0150-M12 TH-21H-2252-M6-0150-M12
G1/2 BSPP
27 mm Hex
TH-21H Design
3
27 mm Hex
40.3 (1.59) 15 (0.59)
Probe Length Probe Length
10.2 (0.40) G1/4 BSPP
30 (1.18) 16 mm Hex
9/16" Hex9/16" Hex
To Order Model No. TH-21A-2252-1/4-0600-M12 TH-21B-2252-1/4-0600-M12
P
M12X1 Typical
1/2-14 NPT
Probe Length Probe Length
Probe Length
30 (1.18)
10.2 (0.40) M12X1 Typical
1/2-14 NPT 1/2-14 NPT
47.7 (1.88)
40.3 Thread TH-21EProbe Design Length M8x1 Mounting
27 mm Hex Dimensions: mm (inch) Ø=diameter
10.6 Typical 10.6 (0.42) (0.42) 10.6 Typical Typical (0.42) Typical
18.5 (0.73)
B Constant 2.3780x10-4 -4 2.3692x10 G1/2 BSPP 2.3585x10-4 2.3441x10-4
Probe Length
1/2-14 NPT
Probe Length
A Constant 1.4705x10-3 1.4052x10-3 1.2870x10-3 1.1275x10-3
38.8 Probe (1.53)Length 38.8
Design
Probe Length ProbeLength Length
Probe Length
M8X1 Thread
Description Probe Length Probe Length 10.2 10.2 Straight sheath, (0.40) 2252 Ω, 1(1.18) ⁄430 " diameter, 6" long, M12 male connector (0.40) Straight sheath with 1⁄2 NPT mounting, 2252 Ω, 1⁄4" diameter, 6" long, M12 male connector Straight sheath with 3⁄8 NPT mounting, 2252 Ω, 1⁄4" diameter, 6" long, M12 male connector M8X1 Thread M8X1 Thread 1/2" Hex Straight sheath with 1⁄4 NPT mounting, 2252 Ω, 1⁄4" diameter, 6" long, M12 male connector
1/2" Hex
30 (1.18)
1/2" Hex
Description Straight sheath 2252 Ω, 6 mm diameter, 150 mm long, M12 male connector Straight sheath with M8x1 mounting, 2252 Ω, 6 mm diameter, 150 mm long, M12 male connector Straight sheath with M10x1 mounting, 2252 Ω, 6 mm diameter, 150 mm long, M12 male connector Straight sheath with G1⁄2 mounting thread, 2252 Ω, 6 mm diameter, 150 mm long, M12 male connector Straight sheath with G1⁄4 mounting thread, 2252 Ω, 6 mm diameter, 150 mm long, M12 male connector
For lengths other than 6", change “-0600” in model number to required length and add additional cost per inch greater than 6", (example: 9" = 0900, 41⁄2" = 0450). For 1⁄8" probe diameters, change “-1/4” in model number to “-1/8”, no additional cost. For 3K, 5K or 10K Ω thermistor elements change “-2252” to desired resistance. For dual element 1⁄4" or 6 mm diameter versions, add “-DUAL” to the end of the model number (not available in 1⁄8" or 3 mm diameter probes), for an additional cost. Ordering Examples: TH-21A-2252-1/4-0600-M12, 1⁄4" diameter probe 6" long with 2252 Ω element, no mounting thread, with M12 connector. TH-21D-2252-1/4-0600-M12, 1⁄4" diameter probe 6" long with Pt100, Class A element, 1⁄4 NPT mounting thread, with M12 connector.
D-2
