1smaller diameter, easily bending 2better seismic resistance accuracy, sensitiveness, quick thermal response, quality stabilit
Overview
Armored thermal resistor is a kind of temperature sensor, who has smaller diameter, easily bending,
better seismic resistance comparing to assembly type platinum resistance. It is suitable to be erected
on the place where the assembly type thermal resistors can’t be erected. Our WZPK series armored thermal
resistor adopts introduced thermal resistor temperature measurement elements, so it has the advantages of
accuracy, sensitiveness, quick thermal response, quality stability, long lifetime.
With stainless steel as exterior protection sleeve and oxidized insulating materials of high density filled inside,
armored thermal resistors characterize antipollution and excellent mechanical strength, so they suits for being
erected in areas where circumstances are bad.
Armored thermal resistors can be used for measurement of temperature between -200°C and 500°C and be connected with secondary instrument directly by copper conductors. Because they have good characteristics
of power output, they can provide accurate temperature variation input signals for display instruments, recording
instruments, accomodometers, scanners, data recording instruments and computers.
Work Principles
Work principles: resistance of hot resistance wire varies as temperature changes, then display instruments will indicate
temperature values corresponding to resistance values produced by thermal resistors.
Main Technique Index
Specific value of resistance value of temperature-sensing elements of thermal resistors at 100 °C and 0°C is R100/R0.
Graduation Pt100: Grade A R0 =100±0.06Ω
Grade B R0 =100±0.12Ω
W100=R100/R0=1.3851
Range Specification
Model | Graduation | Temperature Measurement range °C | Accuracy degree | Allowable deviationΔt°C |
WZPK | Pt100 | -200~500 | Grade A | When it is -200~650°C, allowable deviation is ±(0.15+0.002|t|) |
Grade B | When it is -200~800°C, allowable deviation is ±(0.3+0.005|t|) |
Where” t” is the absolute value of actual measurement temperature of temperature-sensing elements.
Diameter
3)φ3
4)φ4
5)φ5
6)φ6
Junction box type(free terminal type)
1) simple type
2)splash proof type
3)water proof type
6)socket type
7)with connection conductors
Erection Fixation Type
2) without fixation units
3) threads of fixation sleeve
4) movable straight thread
5) fixing straight thread flange
6) movable straight thread flange
armored
thermal resistor materials
thermal resistor
temperature instruments
Nominal Pressure
It generally means protection pipes don’t break while bearing static external pressure. Test pressure
generally is 1.5 times more than nominal pressure. Actually, allowable nominal pressure relates to not
only materials, diameters, wall thickness of protection pipes, but also its structural style, erection methods,
insertion depth and flow velocity, varieties of tested medium.
Thermal Response Time
When temperature step change happens, output change of thermal resistor is equal to 50% of that step change.
The time it takes is called thermal response time indicated by τ0.5.
insulation resistance of thermal resistance
test voltage of insulation resistance in the normal temperature can take any value between 10~100V,
ambient temperature is 15~35°C, relative humidity shall not be more than 80%, insulation resistance value in the normal temperature shall
not be less than 100MΩ.
Thermal resistance allows passing current
The maximum of measured current going through armored resistance does not exceed 5mA.
Armored thermal resistance classification type
junction box type
Simple termination
Splash proof junction box
Water proof junction box
Socket termination
With connection conductor
Erection fixation type
Straight thread bolt type
Straight thread flange type
WZPK Series Armored thermal resistor
