From uncertaintyto stability
21.20
21.20
are designed for high temperature applications. Cable temperature-sensing element is located in thermowell made of high-alumina (C795) or silicon carbide (CC) ceramic. Ceramic thermowell is partially armoured with steel tube. 01.20 and 01.21 are different in metal armour material (12Cr18Ni10Т and AISI 310S correspondingly). It is possible to replace AISI 310S with 15Cr25T steel. Under operating conditions temperature in transition joint of ceramic and metal thermowell sections should not exceed: 800°С – for 01.20 and 01.20A modifications; 1000°С – for 01.21 modifications.
Thermocouple with silicon carbide thermowell which is noted for increased wear resistance, are recommended for use in presence of abrasive particles in medium being measured, and also for melt zinc temperature measurement. 01.20 and 01.21 thermocouples can be equipped with temperature-indicating insert CTx 01.02-005 with bakelite terminal block. 21.20, 21.21 sensors are recommended if precision temperature measurement is required. Such precision is achieved due to periodic calibration or verification. They are similar to 01.20 and 01.21 modifications, and have the same technical specification.
21.xx thermocouple has an additional channel for control or reference thermocouple installation next to temperature-sensing element inside thermowell. Such construction allows to calibrate temperature-sensing element without thermocouple dismantling according to MI 3091--2007 (see pages 2-16). CETN 01 or CETN 02 are used as reference thermocouples (see section 8).
CTxx 21.XX thermocouple design is proved by patent for invention No. 2299408.
Movable fitting UNKJ 031, UNKJ 041 of movable mounting flange UNKJ 030 are recommended for thermocouple installation. Threaded mounting flange UNKJ 039 is used for 01.23 sensor installation (see section 10 "UNKJ mounting hardware").
Explosion-proof versions 0ExiaIICT6 X or 1ExdIICT6 according to GOST 30852.10-2002 are available (except for 21.20, 21.21). For further details see "Alternative designs & Ordering information" below.
Terminal heads can be equipped with transmitters with 4-20 mА DC output signal and/or digital signal via HART, PROFIBUS-PA, FOUNDATION Fieldbus protocol. It is recommended to use heads of 16, 23, 28 modifications for easy wire connection to transmitters. Terminal head can be equipped with standard or special-purpose cable gland. For further details see "Alternative designs & Ordering information" below.
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Hot junction |
one |
Ungrounded |
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two |
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Vibration resistance GOST R 52931 |
group N2 |
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Nominal (rated) pressure |
1.0 MPa |
01.23, 01.24 Modifications |
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0.1 MPa |
01.20, 21.20, 01.21, 21.21 modifications |
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Seismic resistance MSK-64 |
grade 9 for unit installation up to 70 m above zero mark |
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Climatic category GOST 15150 |
UHL2Ambient temperature: |
-60..+120ºС for general purpose products |
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-60..+85 ºС for Ex version with analogous signal |
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-55..+85ºС for products with 4-20mА signal |
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Calibration |
- GOST 8.338-2001 – for sensor fitting length larger than 250 mm, without measuring transmitters; |
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Group of operating conditions |
Probability of |
Specified lifetime |
Mean |
Guarantee |
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II |
0.95 for 16 000 hours |
2 years |
4 years |
2 years |
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III |
0.95 for 8 000 hours |
1 year |
2 years |
1 year |
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IV |
Not rated |
Not rated |
Not rated |
Not rated |
Measurement accuracy of sensors with 4-20 mА DC signal and/or digital signal via HART protocol are given taking into account accuracies of thermocouple itself, transmitter and transmitter's cold junction compensation.
Output signal |
Symbol |
Measurement accuracy |
Output |
Symbol |
Measurement accuracy |
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4-20mА |
c0Т40 |
±0,4% ∙tn* or ±1,5°С |
4-20mА+HART |
c1N25 |
±0,25%∙ tn or ±0,9°С; |
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c1Т50 |
±0,5%∙ tn or ±2,0°С |
c0N40 |
±0,4%∙ tn or ±1,2°С; |
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c2Т80 |
±0,8%∙ tn or ±2,5°С; |
c1N50 |
±0,5%∙ tn or ±1,7°С; |
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c2N80 |
±0,8%∙ tn or ±2,5°С; |
* - tn thermocouple range should be multiplied by specified value in в %. Select higher value.
Response time τ 0,63:
Hot junction |
Sensor response time depending on diameter, s |
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d = 12 |
d = 15 |
d = 20 |
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Insulated from sheath |
30 |
50 |
90 |
Operating temperature:
CT type |
Thermowell material |
Group of operating conditions |
Application |
Calibration interval |
Mean lifetime |
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CTK |
C795, Cc |
II |
-200…+900 |
2 years |
4 years |
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III |
-200…+1100 |
1 year |
2 years |
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IV |
- 200…+ 1250 |
Not rated |
Not rated |
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CTN |
C795, Cc |
II |
-200…+1100 |
2 years |
4 years |
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III |
-200…+1200 |
1 year |
2 years |
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IV |
- 200…+ 1300 |
Not rated |
Not rated |
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CTK |
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01.20A |
— |
0 |
23 |
— |
c1 |
Т50 |
— |
U |
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— |
Cc |
— |
25 |
— |
L |
/ |
lthermowell |
— |
lbend |
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1 |
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2 |
3 |
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4 |
5 |
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6 |
7 |
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8 |
9 |
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10 |
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11 |
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12 |
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13 |
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14 |
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NN |
Name |
Code |
Description |
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1 |
Sensor type |
CTK, CTN |
Mineral insulated cable thermocouple with type according to IEC 60584 and ASTM E230 |
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2 |
Explosion protection |
Not filled |
general purpose electrical equipment |
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Exi |
0ExiaIICT6 X, intrinsically safe circuit |
Not valid for |
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Exd |
1ExdIICT6, explosion-proof enclosure |
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3 |
Modification |
01.20; 01.20A |
with ceramic thermowell, angled (A), reinforcement - stainless steel 12Cr18Ni10T, without mounting elements |
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01.21 |
With ceramic thermowell, reinforcement - heat-resistant steel AISI 310S, without mounting elements |
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01.23 |
With ceramic thermowell, reinforcement - heat-resistant steel AISI 310S, with welded flange |
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01.24 |
With ceramic thermowell, reinforcement - heat-resistant steel AISI 310S, with welded fitting |
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21.20, 21.21 |
Similar to 01.20, 01.21, with additional channel for calibration without dismantling |
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4 |
Cable gland |
0 |
standard cable gland |
Not permitted for 1ExdIICT6 |
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А-Z |
Special cable gland (see table 3 page 1-13) |
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5 |
Sensor terminal |
15; 16;17 |
aluminium head |
IP66/IP68 |
1ExdIICT6 / 0ExiaIICT6 X |
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20, 22 |
aluminium head |
IP65 |
general purpose |
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21, 23; 24; 25; 26; 28 |
aluminium head |
IP66 |
0ExiaIICT6 Х or general purpose |
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6 |
Tolerance class |
c1, c2 |
For further details see table 5 page 2-9 |
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7 |
Output signal, transmitter accuracy symbol, see table 5, page 2-10 |
Not filled |
analogous signal (mV) according to NSC |
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Т40 |
4-20 mА |
for c0 |
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Т50; Т70 |
for c1 |
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Т80; Т100 |
for c2 |
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H25 |
4-20 mА +HART |
Individual sensor calibration (c1) |
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H40 |
for c0 |
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H50 |
for c1 |
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H80 |
for c2 |
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8 |
Hot junction design |
U |
ungrounded junction |
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9 |
Number of wire couples |
Not filled |
1 wire couple |
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2 |
2 wire couples (2 junctions) |
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10 |
Protective sheath material |
C795 |
Aluminium-oxide ceramic 95%, gas-tight |
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Cc |
Gas-tight silicon carbide |
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11 |
Outer diameter |
10 |
mm |
C795 |
150≤lthermowell≤500 mm |
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12, 15 |
mm |
C795 |
200≤lthermowell≤800 mm |
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20 |
mm |
C795 |
150≤lthermowell≤1450 mm |
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25 |
mm |
Cc |
150≤lthermowell≤800 mm |
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12 |
Probe length |
300÷3150 |
probe length L to the working end, mm |
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13 |
Size of lthermowell |
150÷1450 |
specify dimensions in mm |
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14 |
Size of lbend |
300÷2000 |
Specified only for 01.20A |
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Fitting standard size |
М27, М33, C3/4, C1 |
Specify thread size |
for 01.24 |
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Flange type |
Dn.Pn version |
Flange parameters |
for 01.23 |
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