CTC temperature probes are configured by mechanical shape, sensing element, lead construction, terminal type, dimensions and cable length. The family includes seven thermocouple element designations together with Pt100 and Cu50 resistance-temperature options. Nine shape codes cover threaded probes, waterproof versions, spring-loaded probes, small probes, ring forms and clamp forms.
Select the sensing element to match the receiving instrument, then choose the mechanical dimensions for the installation. Dimension codes depend on the selected shape: a probe length, thread, tube diameter, ring aperture or clamp diameter can form part of the order. The tables below keep these choices separate.
Ordering Fields
The ordering layout is CTC-[shape][element][lead][terminal]/[dimensions]-[cable length]. For example, CTC-1K2U/100M12-L2 identifies shape 1, K element, lead code 2, U terminals, a 100mm probe with M12×1.5 thread, and a 2m cable.
Seven-field ordering diagram; preserve the hyphen and slash positions in complete codes.
Shape code
Mechanical form
1
Probe type
2
Waterproof probe type
3
Imitation-probe form
4
Waterproof imitation-probe form
5
Screw type
6
Compression-spring type
7
Small-probe type
8
Gasket/ring type
9
Hoop/clamp type
Element code
Sensing element
Element family
K
K-type thermocouple
Thermocouple
E
E-type thermocouple
J
J-type thermocouple
L
L-type thermocouple
T
T-type thermocouple
R
R-type thermocouple
S
S-type thermocouple
P
Pt100 resistance-temperature sensor
RTD / resistance-temperature sensor
C
Cu50 resistance-temperature sensor
Lead code
Lead construction
Condition
1
Shielded wire
Default lead option
2
Wrapped lead
Lead-construction option
3
PVC wire
Resistance-temperature sensor option
4
Silver-plated wire
For Pt100
5
PTFE/Teflon wire
Corrosion-resistant lead option
Terminal code
Termination
U
U-shaped terminal
H
Pin terminal
Y
Small yellow plug
Cable-length codes L1–L5 denote lengths in metres: L1 is 1m and L2 is 2m. Cable length is not limited to L5. Dimension parameters are selected from the tables for the relevant shape. A ★ marks an individually recommended specification.
Shapes 1 and 2: Probe and Waterproof Probe
Probe length
Length code
Recommendation
100mm
100
—
150mm
150
—
200mm
200
★
250mm
250
—
300mm
300
—
Thread
Thread code
Recommendation
M12×1
M12A
★
M12×1.5
M12
—
Shapes 3 and 4: Imitation-Probe Forms
Probe length
Length code
50mm
50
100mm
100
150mm
150
200mm
200
250mm
250
300mm
300
350mm
350
400mm
400
450mm
450
500mm
500
Shape 5: Screw Type
Thread
Thread code
Recommendation
M6×1
M6
★
M6×1.25
M6A
—
M8×1.25
M8A
—
M8×1.5
M8
—
Shape 6: Compression-Spring Type
Probe-tube length
Length code
Recommendation
10mm
10
—
20mm
20
—
30mm
30
★
40mm
40
—
50mm
50
—
Thread
Thread code
M8×1.25
M8A
M8×1.5
M8
M10×1
M10A
M10×1.5
M10
M12×1
M12A
M12×1.5
M12
Shape 7: Small-Probe Type
Probe length
Length code
Recommendation
30mm
30
★
40mm
40
—
50mm
50
—
Probe diameter
Diameter code
Recommendation
3mm
D3
—
4mm
D4
★
5mm
D5
—
6mm
D6
—
Shape 8: Gasket/Ring Type
Aperture
Aperture code
Recommendation
4mm
C4
★
5mm
C5
—
6mm
C6
—
Shape 9: Hoop/Clamp Type
Clamp diameter
Diameter code
40mm
C40
45mm
C45
50mm
C50
55mm
C55
60mm
C60
65mm
C65
Photographs and dimension-option layouts for all nine shape codes; paired columns describe separate selection dimensions.
Complete Ordering Examples
Mechanical form
Complete example
Dimension field
Cable length
Probe, shape 1
CTC-1K2U/100M12-L2
100mm probe; M12×1.5 thread
2m
Imitation probe, shape 3
CTC-3K1U/200-L2
200mm probe
Screw, shape 5
CTC-5K1U/M8-L2
M8×1.5 thread
Compression spring, shape 6
CTC-6K2U/M12-L2
M12×1.5 thread; this example does not encode a probe-tube length
The spring form has separate probe-tube length options in its dimension table. Specify the required tube length together with the thread when defining that configuration. Regional specifications may differ.
