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SCTB ElPA Ltd. (special engineering and design bureau of electronics, instrument-making and automation) is an assign of Uglich branch of NIIChasprom, established in 1959 on the Uglich watch plant Chaika territory for applied science and production consolidation. On the last 28 years SCTB ElPA specializes in manufacture and R&D of quartz resonant devices.

 

Compact quartz temperature sensor

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Quartz crystals are widely used in today's electronic equipment, generators and stable frequency filters. But quartz relevant sections and structures are also used to measure various physical parameters such as temperature, pressure, humidity, acceleration. [1,2] For example, pressure sensors. In precision barometer, a precise gauge of absolute pressure in downhole pressure sensors from companies such as Druck (UK), Quartzdyne (USA), Spartek Systems (Canada), Schlumberger (France), Ltd. "SKTB ELPA" (Russia) apply piezoresonance sensors (PCHE).

 Thermosensitive PCHE used to measure temperatures in the range from -60 to 300 0 C. Russian firm "KvartsSens" developed and produced a series of quartz transducers and temperature sensors, frequency and digital outputs. One of the new developments is a compact temperature transmitter PTC-0.05-3M, which has a small footprint Ø5 x 30 mm ., And consists of a thermosensitive quartz resonator RKTV206 - 1; oscillator - 2; thermowell (12X18H10T) - 3, three-wire cable for connection to a frequency meter and power supply - 4, Fig. 1.

 Operating temperature range of -60 to drive 120 0 C. The upper temperature limit is restricted to use electronic components oscillator.

 The converter has a frequency output, respectively, the temperature can be calculated by the formula:

 t = t0 + C1 (ΔF - F 0) + C 2 (ΔF - F 0) 2 + C 3 (ΔF - F03

 where: t - the measured temperature;

 ΔF - current frequency converter;

 F 0 - frequency corresponding to the reference temperature t 0

 C 1, C 2, C 3 - factor determined during calibration in the range of operating temperatures for each individual inverter in your passport.

 

ptk_0.05draw      ptk-3m

Fig.1 PTK-0 ,05-3M

  The advantages of compact quartz transducer is: high accuracy, long-term stability, the ability to transmit low frequency signal for distances up to hundreds of meters, the possibility of building a simple measurement channel or multiple channels.

Comparative characteristics of quartz temperature transmitters are shown in Table 1.

 Tab. 1 Characteristics of the quartz temperature transmitters series DCT

OPTIONS
PTK-0.3-2Р
PTK-0.05-2Р
PTK-0.05-МР
PTK-3М
PTK-0.05-5М
values
Overall dimensions Housing
66 х 68 х 18
66 х 68 х 18
Ø20 х 50
Ø5 ... 12 х 30... 450
Ø20 х 60
mm
probe
Ø6 х 40 ... 100
Ø6 х 100 ... 1000
Ø5...12 х 100 ... 100
Ø6 х 87 ... 1500
Operating Temperature Range
- 60 … + 60
- 60 … + 60
- 60 … + 300
- 60 … + 120
- 40 … + 90
°C
Basic absolute error
0.3; 0.5
0.05; 0.1; 0.3; 0.5
0.05; 0.1; 0.3; 0.5. for t>100+Δtx0.003
0.05; 0.1; 0.3; 0.5
0.05
°C
Resolution
0.01
0.005
0.005
0.005
0.005
°C
Frequency output. Range
300…600
300…600
300…1100
32000…36000
250…600
Hz
Sensitivity
2
2
2
2
2
Hz / ° C at t = 40 ° C
Supply voltage
5 to 14
5 to 14
3 to 14
3 tо 14
5 tо 14
V
Amplitude of the output signal when: Rmin = 600 Om; Cmax = 15tA
Uпит - 0.5
Uпит - 0.5
Uпит - 0.5
Uпит - 0.5
Uпит - 0.5
V
Current consumption, no more
6
6
6
1
6

 

The use of a longer probe can reduce the error caused by changes in ambient temperature and allows the measurement of higher temperatures by moving the generator from the "hot zone."

Long-term stability of converters is high and depends on the type of heat-sensitive resonator.

 Figure 2 shows the graphs of temperature-sensitive quartz resonators testimony RKTV206 for 5 weeks. Resonator is in the chamber at a temperature of 160 ° C, in the active state (with permanently active generator).

 graf_ptk0.05

 The graph shows that the deviation of the 5 weeks did not exceed 0,06 ° C, with a resonator RKTV206 (B) with a heat-sensitive piezo tuning fork mounted fusible glass, this deviation is much smaller and does not exceed 0,02 ° C

 Tests for long-term storage of temperature-sensitive resonators at +85 ° C during the year showed that the average reading care resonators RKTV206 was ± 0,12 ° C, and a resonator RKTV206 (B) of ± 0,05 ° C. Miniature temperature transmitters with PCHE can be used in systems for Heat, in housing, and in various industrial processes.

 Today the company "SKTB ELPA" together with "KvartsSens" Undertake long-term research and development work on the development and organization of pilot production of primary converters for sensor-based sensor piezoresonance of lanthanum Galiev tantalate.

 A single crystal of lanthanum Galiev tantalate piezoelectric effect remains up to the melting point of 1470 ° C. In this case, the piezoelectric modulus in the temperature range up to +500 ° C decreases by only 5%.

 Developed inverter frequency output will be 40-50 kHz, measured temperatures from - 60 ° C on d + 650 ... 900 ° C and an accuracy of temperature 0,6 ° C (600 ° C) and the resolution of 0,02 ° C. The above parameters make a good low-cost alternative transducer high temperature platinum RTD and thermoelectric converters.


 1. Малов В.В. Пьезо-резонансные датчики. Энергоатомиздат, 1989г.
2. Поляков А.В. , Заднепряный И.Е. , Поляков В.Б. , Симонов В.Н. 

Прецизионные кварцевые датчики // Журнал «Компоненты и технологии». -2005г. №6. с.56.   


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