CN209085802U - A kind of portable multi-channel temperature testing device control system - Google Patents

Abstract

The utility model provides a kind of portable multi-channel temperature testing device control system, mainly includes path setting and control module, the acquisition of Multi-channel hot resistance heat electric potential signal or output module, multichannel thermocouple thermoelectrical potential signal acquisition or output module and hot thermocouple electric potential signal generator module.Using the multichannel temperature test device of above-mentioned control system, multichannel temperature testing efficiency can be improved, to provide a kind of portable multi-channel temperature testing device control system, so that temperature testing device meets the requirement that small in size, low in energy consumption, structure is simple, service efficiency is high, improves thermometric instrument detection efficiency and save related thermal field test equipment acquisition expenses.

Description

A kind of portable multi-channel temperature testing device control system

Technical field

The utility model relates to temperature measuring device field, specially a kind of thermal resistance/thermocouple thermometer control system is used In the calibrating installation of thermal field uniformity test and the thermometric instrument error of indication in heating (or refrigeration) equipment, belong to control system skill Art field.

Background technique

According to domestic air mail standard HB5425-2012 " aeronautical products heat-treatment furnace effective heating area measuring method " and external Relevant regulations in AMS2750E " high temperature measurement " standard, the metering to technological temperature instrument are general using band simulation thermoelectrical potential letter Number output " high precision instrument for testing ", in use, operator need every time connection monolithic technology thermometric instrument carry out thermoelectrical potential Signal input, testing calibration after being powered, stablizing are time-consuming and laborious.Metrological personnel, which has wished to a kind of test device, to be connected simultaneously Muti-piece is detected the thermoelectrical potential signal input part of thermometric instrument, is powered, carries out testing calibration simultaneously after pre- thermostabilization, improves instrument Measurement efficiency.

According to the relevant regulations in the above standard, volume≤6.4m³The test of heating equipment thermal field uniformity, need to be by wanting It asks and fixes 9 temperature sensors, when test: needing to read in 2 minutes and record this 9 temperature sensor datas one time, amounting to needs 16 Time or more.When now carrying out data acquisition using single channel temperature measuring device, need manually constantly to change each branch dut temperature test biography It is 144 times or more total that sensor reads thermal field data.

As using thermal field uniformity in " data collection system " test heating (or refrigeration) equipment, then having the disadvantage that Equipment is heavy, volume is big (averagely weighs 20kg, 0.5m³), it has not been convenient to it carries, and can only be in the work that can get AC220V AC power source Make scene to use；At high cost, separate unit acquisition expenses is at 100,000 yuans or more.

Summary of the invention

For the above-mentioned prior art, the technical issues of the utility model is solved, is to provide a kind of portable multi-channel temperature Test device control system, so that temperature testing device meets the requirement that small in size, low in energy consumption, structure is simple, service efficiency is high, It improves thermometric instrument detection efficiency and saves related thermal field test equipment acquisition expenses.

In order to solve the above technical problems, the utility model mainly uses following technical scheme:

This temperature testing device control system specifically includes that path setting and control module, Multi-channel hot resistance thermoelectrical potential Signal acquisition or output module, multichannel thermocouple thermoelectrical potential signal acquisition or output module and hot thermocouple electric potential signal occur Device module.

" path setting and control module ".Shown in referring to Fig.1, module is by multiturn potentiometer RP₁, time base circuit IC₁, ten into Counter IC processed₂, hilted broadsword ten throw the components such as change-over switch S composition, when the module is for controller automatic circling measurment, each The setting of number of channels is participated in when the setting and inspection of channel dwell time.Module each section connection relationship is as follows: DC6V direct current Power supply is through switch K₁It is reached at A point after protective tube FU, to resistance R₁、IC₁、IC₂, diode VD₁With Fig. 4 (hot thermocouple potential letter Number generator) etc. circuits power supply；IC₁2nd, 6 feet pass through switch K₂, multiturn potentiometer RP₁, resistance R₂、R₁Connect A point, the other end Meet capacitor C₁Anode, capacitor C₁Another termination power cathode.IC₁1st foot and capacitor C₂One end is connected with power cathode together.When Switch K₂When closure, DC6V DC power supply passes through resistance R₁、R₂With potentiometer RP₁、K₂To capacitor C₁Charging, IC₁6th foot current potential is not It is disconnected to increase, when reaching 4V, IC₁3rd foot is jumped by high potential as low potential, signal input IC₂14th foot；Inspection is transferred to next Channel.Adjust RP₁Resistance value can adjust IC₂Polling rate.Disconnect switch K₂When, C₁Two terminal potentials cannot continue to increase IC₁3rd Foot exports high potential always；IC₂Inspection stops, and pinpoints output high potential in the channel；Corresponding channel indicator light LEDx is always on.IC₂ 15th foot is connected with the knife position that hilted broadsword ten throws change-over switch S, and the 1st ~ 9 throwing point is respectively and IC₂Q₀~Q₈Output end and corresponding channel Light-emitting diode LED_1~9Anode is connected, wherein the 10th throwing point S₁₀And IC₂8th, 13 feet and resistance R₃It is negative with power supply after the connection of one end Extremely it is connected." acquisition of Multi-channel hot resistance heat electric potential signal or output module ".Referring to shown in Fig. 2, module is by DC5V direct current double-pole Double-throw relay J₁~J₂₀、WZ₁~WZ₁₀For Pt₁₀₀Thermoelectricity resistance type temperature sensor, rectifier diode VD₁~VD₁₀, NPN type triode BG₁~BG_10、Multiturn potentiometer RP₂And RP₃Deng composition, module for thermoelectricity resistance type temperature sensor test thermal field uniformity when from Thermoelectrical potential signal input action.Module is used for Pt₁₀₀The detection of the thermometric instrument error of indication of thermoelectricity resistance type thermoelectrical potential signal input When calibration, play thermoelectrical potential signal output action.Module each section connection relationship is as follows: A point DC6V DC power supply passes through diode VD₁With switch K₃One end, capacitor C₃Anode and relay J₁With the diode VD for removing self-induced e.m.f₂It is connected, switch K₃The other end with J₂Connection.J₁、J₂The other end and VD₂Anode, which is connected, is followed by triode BG₁Collector, BG₁Emitting stage is connected with ground, and base stage passes through electricity Hinder R₄And Q₀It is connected, wherein relay J₁、J₂Both ends be connected respectively with AI-5600 type high accuracy number temperature measurer input terminal, J₁、 J₂Remaining both ends respectively and WZ₁Two Same Name of Ends of thermal resistance temperature sensor are connected, relay J₃、J₄To J₁₉、J₂₀Line with The J₁And J₂It is essentially identical.

" multichannel thermocouple thermoelectrical potential signal acquisition or output module " with " Multi-channel hot resistance heat electric potential signal acquisition or The composition of output module ", principle are essentially identical.

" hot thermocouple electric potential signal generator module ".Referring to shown in Fig. 4, module is by resistance R₁₅~R₁₉, triode BG₁₁、 BG₁₂And RP₄The composition such as bridge circuit is formed between C ', the both ends D '.The specific effect of the module is: DC power supply passes through R₁₄Current limliting Stable DC2.5V reference voltage, resistance R are obtained after TL431 pressure stabilizing in B point₁₅~R₁₉, triode BG₁₁、BG₁₂And RP₄In C ', D ' Bridge circuit is formed between both ends, works as RP₄When resistance value is adjusted to 0 Ω, signal generator D ' C ' heat outputting potential value≤- 3.5mV (being equivalent to corresponding 90 international temperature scale potential value when temperature≤- 80 DEG C) increases RP₄Resistance value C ' point current potential decline, D ' put current potential It remains unchanged, with RP₄Resistance value continues to increase, and D ' current potential is higher than C ' and puts current potential, and the thermoelectrical potential value exported between D ' C ' is with increasing Greatly, work as RP₄When resistance value is adjusted to 100 Ω, thermoelectrical potential value >=55mV of D ' C ' output, corresponding 90 international temperature scale temperature value >=1300 ℃；Increase RP₅Resistance value, BG can be reduced₁₂Base current increases since the current value is microampere magnitude, subtracts RP₅Resistance value when only U can be brought_D’The minor change of current potential, so be trimmer potentiometer, fine tuning when plaing a part of to simulate the output of thermoelectrical potential temperature.Module Each section connection relationship is as follows: triode BG₁₁Base stage (i.e. B point) and resistance R₁₄One end and voltage-stabiliser tube TL431 the 1st, 3 feet and more Enclose potentiometer RP₅It is connected, BG₁₁Collector passes through multiturn potentiometer RP₄Resistance R₁₅And R₁₄The other end and resistance R₁₆After one end is connected Meet A point, resistance R₁₇And BG₁₁、BG₁₂Collector is connected.

Above-mentioned control system, using DC6V DC-voltage supply, average power consumption electric current 100mA, using 1500 mAh of capacity Nickel separation cell power supply can be continuous work 15 hours or more；Without inputting AC220V AC power source, it has been isolated in utility grid All kinds of interference signals, improve measurement accuracy；It effectively reduces that equipment volume is small and weight, meets finished-product volume≤0.08 m³、 Weight≤0.7kg.

Using the multichannel temperature test device of above-mentioned control system, efficiency when following test: use >=2 can be improved When branch thermocouple type temperature sensor tests thermal field uniformity；It is uniform using >=2 thermoelectricity resistance type temperature sensor test thermal fields When property；Using >=2 pieces of Graduation Numbers are as follows: the inspection of the thermometric instrument error of indication of K, E, N, J, T thermocouple type thermoelectrical potential signal input When surveying calibration；Using >=2 pieces of Pt100 thermoelectricity resistance type thermoelectrical potential signals input the thermometric instrument error of indication testing calibration when.

Detailed description of the invention

Fig. 1 is path setting and control module schematic diagram.

Fig. 2 is the acquisition of Multi-channel hot resistance heat electric potential signal or output module schematic diagram.

Fig. 3 is multichannel thermocouple thermoelectrical potential signal acquisition or output module schematic diagram.

Fig. 4 is hot thermocouple electric potential signal generator module schematic diagram.

Specific embodiment

Below with reference to Fig. 1 ~ Fig. 4, the technical solution of the utility model embodiment is clearly and completely described, it is clear that Described embodiment is only the utility model a certain kind specific embodiment, instead of all the embodiments.

When for heating equipment thermal field uniformity measurement:

To use in 9 thermoelectricity resistance type temperature sensor measurement heating equipments for thermal field uniformity, when thermal field is tested The even wiring of good AI-5600 hand held high precision temperature temperature measurer.Closure switch K₁、K₂、K₃, ten throw switch S of hilted broadsword thrown in S₉ Position, by WZ₁The two of thermal resistance temperature sensor are of the same name to be terminated at relay J₁Double-throw position connecting part；Another two Same Name of Ends connection In relay J₂Double-pole position connecting part (as shown in Figure 2).Similarly complete WZ₂To WZ₉The wiring of thermal resistance temperature sensor.This When LED_1~9Channel indicator light is successively lighted, corresponding WZ_1~9Temperature sensor output temperature value is successively high in AI-5600 hand-held It is shown on precision thermometer.Adjust RP₁Each interchannel polling rate is selected (when polling rate is fast, to increase RP₁Resistance value, that is, it is adjustable Slowly) when certain channel temperature value of display need to be pinpointed, switch K is disconnected₂Inspection stops.Then always show the channel temperature value until It is closed K again₂Inspection continues.When such as only using 5 temperature sensor tests, ten throw switch S of hilted broadsword is placed in S₅Position.

When using thermocouple type temperature sensor test thermal field uniformity, line is as shown in figure 3, by each test thermocouple One-to-one correspondence connects in relay J₁、J₃ ~ J_XDouble-throw position connecting part, while AI-5600 high accuracy number temperature measurer is set as thermoelectricity Even signal input, it is identical when other operations are with Thermistor Temperature Measurement.

For " the digital temperature indicating regulator table " error of indication detection, calibration when:

It is that (0 ~ 1000) DEG C thermocouple type temperature thermoelectrical potential inputs digital displaying temperature to detect 6 temperature ranges simultaneously For the indicating regulator table error of indication, first the line of 6 pieces of tested thermometric instrument thermoelectrical potential signal input parts is connect in order Relay J₁、J₃、J₅、J₇、J₉、J₁₁Double-throw end line when anode to D wire tag, cathode to C wire tag.It will be in Fig. 3 and Fig. 4 C point to C ' point, D point to D ' point be correspondingly connected with, close a switch K₁、K₂Disconnect K₃Rotate potentiometer RP₁Change channel polling rate To satisfaction.According to the related request in JJG617-1996 " digital temperature indicating regulator " national metrological verification regulations: tested Temperature indicating instrument is powered after preheating 30min, rotates clockwise potentiometer RP₄90 international temperature scale thermoelectrical potential values are exported gradually to rise Height, when displays temperature value is close to 200 DEG C on AI-5600 high accuracy number temperature measurer；Fine tuning knob RP is adjusted clockwise₅Make to survey Temperature value on Wen Yi is slowly raised to 200.0 DEG C, records the reading value A of 6 pieces of tested thermometric instruments at this time₁、A₂、A₃、A₄、A₅、 A₆A is used respectively₁~A₆Subtracting 200.0 is error of the 6 deblocking temperature instrument in 200 DEG C of points.It similarly completes: 400 DEG C of trace, 600 ℃,800℃,1000℃；The detection of 800 DEG C of return, 600 DEG C, 400 DEG C, 200 DEG C, 0 DEG C point errors of indication.Foundation testing result, The corresponding Sc error correction button adjusted built in tested instrument carries out error of indication calibration, and the indicating value that each piece of instrument can be improved is accurate Property.

When for the detection of the technical process measurement recording apparatus error of indication:

" technical process measurement recorder is inputted with 2 temperature range (- 50 ~ 200) DEG C thermoelectricity resistance type thermoelectrical potential signals of detection At 0 DEG C of table " for the error of indication, by WXD₃Type multi-turn adjustable potentiometer RP₂、RP₃Etc. being incorporated to high accuracy number temperature measurer thermoelectrical potential Signal input part connects the signal input part of tested technical process measurement instrument in J₁、J₂Place, close a switch K₁~K₃Work as LED₁Refer to When showing that lamp is lighted, switch K is disconnected₂It is powered after stablizing 30min, rotates coarse adjustment potentiometer RP₂Connect tested thermometric instrument instruction pointer At nearly 0 DEG C, fine tuning potentiometer RP is rotated₃Make to indicate that pointer refers on 0.0 DEG C of point, writes down the number note on digit thermometer at this time For B₁；Use 0.0-B₁Difference be the point the error of indication.It so completes: 50 DEG C, 100 DEG C, 150 DEG C, 200 DEG C of trace；Instead The detection of 150 DEG C of journey, 100 DEG C, 50 DEG C, 0 DEG C, -50 DEG C point errors of indication takes in each test point maximum error amount as the block The error of instrument.The similarly detection of the error of indication of achievable second deblocking temperature instrument.

Claims (5)

1. a kind of portable multi-channel temperature testing device control system, it is characterized in that: the control system is by path setting and control Molding block, the acquisition of Multi-channel hot resistance heat electric potential signal or output module, multichannel thermocouple thermoelectrical potential signal acquisition or output Module and hot thermocouple electric potential signal generator module composition.

2. control system as described in claim 1, it is characterized in that: the path setting and control module are by multiturn potentiometer RP₁, time base circuit IC₁, decade counter IC₂, hilted broadsword ten throw the components such as change-over switch S composition, the connection of each component is closed It is as follows:

DC6V DC power supply is through switch K₁It is reached at A point after protective tube FU, to resistance R₁、IC₁、IC₂, diode VD₁And thermocouple The power supply of the circuits such as thermoelectrical potential signal generator；IC₁2nd, 6 feet pass through switch K₂, multiturn potentiometer RP₁, resistance R₂、R₁A point is connected, IC₁2nd, another termination capacitor C of 6 feet₁Anode, capacitor C₁Another termination power cathode；IC₁1st foot and capacitor C₂One end together and Power cathode is connected；As switch K₂When closure, DC6V DC power supply passes through resistance R₁、R₂With potentiometer RP₁、K₂To capacitor C₁It fills Electricity, IC₁6th foot current potential constantly increases, when reaching 4V, IC₁3rd foot is jumped by high potential as low potential, signal input IC₂The 14 feet；Inspection is transferred to next channel；Adjust RP₁Resistance value can adjust IC₂Polling rate；Disconnect switch K₂When, C₁Two terminal potentials It cannot continue to increase；IC₁3rd foot exports high potential always；IC₂Inspection stops, and pinpoints output high potential in the channel；It is corresponding logical Road indicator light LEDx is always on；IC₂15th foot is connected with the knife position that hilted broadsword ten throws change-over switch S, and the 1st ~ 9 throwing point is respectively and IC₂Q₀ ~Q₈Output end and corresponding channel Light-emitting diode LED_1~9Anode is connected, wherein the 10th throwing point S₁₀And IC₂8th, 13 feet and resistance R₃ It is connected after the connection of one end with power cathode.

3. control system as described in claim 1, it is characterized in that: the Multi-channel hot resistance heat electric potential signal acquisition or defeated Module is by DC5V direct current dpdt relay J out₁~J₂₀、WZ₁~WZ₁₀For Pt₁₀₀Thermoelectricity resistance type temperature sensor, two poles of rectification Pipe VD₁~VD₁₀, NPN type triode BG₁~BG_10、Multiturn potentiometer RP₂And RP₃Deng composition, the connection relationship of each component is as follows:

A point DC6V DC power supply passes through diode VD₁With switch K₃One end, capacitor C₃Anode and relay J₁With remove self-induced e.m.f Diode VD₂It is connected, switch K₃The other end and J₂Connection；J₂The other end and VD₂Anode, J₁The other end, which is connected, is followed by triode BG₁ Collector, BG₁Emitting stage is connected with ground, and base stage passes through resistance R₄And Q₀It is connected, wherein relay J₁、J₂Both ends respectively and AI- 5600 type high accuracy number temperature measurer input terminals are connected, J₁、J₂Remaining both ends respectively and WZ₁The two of thermal resistance temperature sensor Same Name of Ends is connected, relay J₃、J₄To J₁₉、J₂₀Line and the J₁And J₂It is essentially identical.

4. control system as described in claim 1, it is characterized in that: the multichannel thermocouple thermoelectrical potential signal acquisition or defeated Module component composition and connection relationship and the acquisition of Multi-channel hot resistance heat electric potential signal or output module are similar out.

5. control system as described in claim 1, it is characterized in that: the hot thermocouple electric potential signal generator module is by electricity Hinder R₁₅~R₁₉, triode BG₁₁、BG₁₂And RP₄The composition such as bridge circuit is formed between C ', the both ends D ', each component connection relationship is such as Under:

Triode BG₁₁Base stage (B point) and resistance R₁₄One end and voltage-stabiliser tube TL431 the 1st, 3 feet and multiturn potentiometer RP₅It is connected, BG₁₁ Collector passes through multiturn potentiometer RP₄Resistance R₁₅And R₁₄The other end and resistance R₁₆One end, which is connected, is followed by A point, resistance R₁₇And BG₁₁、 BG₁₂Collector is connected.