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Explosion-proof Multi-point Armored Thermoresistor
- Product Description
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Explosion-proof Multi-point Armored Thermoresistor
Explosion-proof multi-point armored thermoresistors are a special structural variant ofPt100 platinum resistance thermometers, belonging to the same “family” as the thermocouples you learned about in the previous round—both are explosion-proof multi-point armored temperature sensors, differing only in their core temperature-sensing elements.
Core Technical Parameters
Parameter Typical Value / Range Description Resistance Temperature Detector (RTD) Class Pt100(Platinum Resistance) Industry Standard; Cu50 Copper Resistance Also Available Temperature measurement range -200℃ ~ +500℃ Typical range for platinum resistance; copper resistance only -50~100℃ Number of measurement points 2 to 32 points(customizable to more) 3-point, 6-point, and 12-point configurations are common specifications Explosion-proof rating dⅡBT4 ~ dⅡCT6 CT6 is the highest rating, suitable for environments containing hydrogen and other gases Protection Rating IP65 Dustproof and waterproof, suitable for harsh environments Thermal Response Time ≤ 3s ~ ≤ 12s(depending on the sheath diameter) Φ3 armored type: as fast as ≤3s; Φ6: about 12s Armored Outer Diameter Φ3mm ~ Φ8mm For diameters ≤Φ5, the maximum insertion depth can exceed 30 meters Accuracy Class Class A / Class B Class A: ±(0.15+0.002|t|)°C; Class B: ±(0.30+0.005|t|)°C Installation Method Fixed Thread, Fixed Flange, Swivel Ferrule Customizable to match on-site connections Conduit Material 1Cr18Ni9Ti (304), 316L, etc. Selected based on the corrosivity of the medium Junction Box Type Waterproof, Explosion-proof, Stainless Steel Flameproof Enclosure Explosion-proof environments must use explosion-proof models Product Features
Accurate and Stable Temperature Measurement: Uses imported platinum resistance elements (Pt100), offering high precision, eliminating the need for compensation leads, and at a lower cost than thermocouples.
Explosion-Proof Safety: The junction box features an explosion-proof design compliant with IEC standards, achieving an explosion-proof rating of dⅡCT6.
Robust and Durable: Armored construction combined with a spring‑loaded temperature-sensing element ensures pressure resistance, vibration tolerance, and a long service life.
Multi‑Point Integration: A single mounting hole can measure temperatures at multiple depths, reducing installation costs.
Barrier Structure: A dielectric barrier is installed between the armored core and the junction box, preventing medium ingress in case of sheath damage.
Typical Application Scenarios
Fertilizer Industry: Temperature measurement at different depths inside synthesis towers and reaction vessels (this was the original design intent behind multi-point armored resistance thermometers)
Petrochemical industry: Temperature gradient monitoring inside distillation columns and reaction vessels
Tank temperature measurement: Multi-point temperature measurement inside storage tanks for edible oils and chemical raw materials
General industrial applications: Temperature measurement of liquid, steam, and gaseous media within the range of -200℃ to 500℃
Product model analysis (taking WZPK-240D as an example)
Code position Meaning Option description WZP Product Type Thermal Resistance (WZP is platinum resistance, WZC is copper resistance) K Armored Structure Armored Type - Connector — 2 Mounting Device 1-Non-fixed / 2-Fixed thread / 3-Swivel joint / 4-Fixed flange 4 Junction Box Type 2-Splash-proof / 3-Waterproof /4-Explosion-proof/ 7-Stainless steel explosion-proof enclosure 0 Output type 2-Two-wire system /3-Three-wire system(recommended) D Design sequence number Multi-point type Comparison with Explosion-Proof Multi-Point Sheathed Thermocouples
Comparison Item Explosion-proof Multi-point Armored Thermoresistor Explosion-Proof Multi-Point Sheathed Thermocouple Resistance Temperature Detector (RTD) Class Pt100, Cu50 K, E, J, T, S, R, etc. Temperature measurement range -200℃ ~ +500℃ -40℃ ~ +1300℃ Accuracy Higher(Class A/Class B) General (Class I/Class II) Cost Lower (no compensation wire required) Higher (requires compensation wire) Applicable Scenarios Medium to low temperature with high precision requirements High temperature with fast response Key Selection Considerations
When placing an order, you must clearly communicate the following key information to the manufacturer:
Thermocouple Type and Temperature Range: Confirm whether the maximum temperature is within 500℃
Number of Measurement Points and Depth at Each Point: Provides the exact depth of each temperature measurement point from the mounting flange surface (this is the core of customization)
Explosion-proof Rating: Specify the requirements according to the explosion-proof zone classification, such as Ex d IICT6
Process connection specification：Flange or thread? Please specify the standard, pressure rating, and size
Protective tube material：ｓｅｌｅｃｔ based on the corrosivity of the medium (standard: 1Cr18Ni9Ti/304)
Output Configuration：Three-wire configuration recommended (to eliminate lead resistance errors)
Usage and Maintenance Recommendations
Installation: When bending the armored section, the bend radius should be no less than 5 times its diameter
Wiring：Must use a three-wire configuration to eliminate measurement errors caused by lead resistance
Measurement Current: The measurement current through the RTD should be ≤5 mA to avoid self-heating errors
Regular Calibration: It is recommended to perform periodic calibration according to standards to ensure accuracy
If you can provide the specific number of measurement points, insertion depth at each point, maximum temperature, explosion-proof rating, and mounting interface, I can help you with precise model selection.
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