SGI-HT SERIES · HIGH TEMPERATURE INDUCTIVE PROXIMITY SENSOR
High Temperature Inductive Proximity Sensor — SGI-HT Series, Rated to +120 °C / +150 °C
Stainless steel inductive proximity sensors for hot machine zones: M8, M12, M18 and M30 housings, flush or non-flush, NPN / PNP / DC 2-wire outputs, 2 m cable. Two temperature classes — T120 (max. +120 °C) and T150 (max. +150 °C) — plus a low-temperature version to -30 °C. 95 part numbers in the selection table below. SEGMENsensor supplies from 10 pcs MOQ, samples in 5–7 days, production in 3–5 weeks.
CE CertifiedStainless Steel HousingMOQ 10 pcsSince 2019
What is a High Temperature Inductive Proximity Sensor?
A high temperature inductive proximity sensor is a non-contact metal detection switch whose coil, oscillator electronics, seals and cable are specified to keep switching reliably at ambient temperatures far above the +70 °C limit of a standard inductive sensor. SEGMENsensor's SGI-HT series is rated by class in the part number — T120 = max. +120 °C, T150 = max. +150 °C — and the same platform is also built as an L30 low-temperature version (min. -30 °C). All models use a stainless steel housing, are available flush (S) or non-flush (U) in M8 to M30, and switch NPN, PNP or DC 2-wire, NO or NC. Typical uses: end-of-stroke detection on die-casting and injection-molding machines, position sensing in paint drying and curing ovens, kiln and furnace loading equipment, steel-mill roller tables, and cold-storage conveyors.
Model Selection Table
SGI-HT High Temperature Inductive Proximity Sensor — 95 Part Numbers
Every part number encodes its own specification. Pick the housing size first (M8 20 models · M12 15 · M18 20 · M30 40), then mounting, sensing range, output and temperature class. Supply voltage: NPN / PNP versions 10–30 V DC; DC 2-wire versions 10–60 V DC (two M30 exceptions at 10–30 V DC are marked in the table). Connection is a 2 m cable on all models. IP rating, switching frequency and output current are confirmed per model on the datasheet.
How to Read an SGI-HT Part Number — and Flush vs Non-Flush Mounting
The part number is the specification. Decode it with the table, then use the mounting diagram to decide between the flush (S) and non-flush (U) version for your fixture.
Illustration — SGI-HT part number structure using SGI-HT12U-040NA-C2-T120 as the example.
Segment
Code
Meaning
Prefix
SGI
Inductive proximity sensor (SGC = capacitive)
Series
HT
High-temperature / low-temperature series
Thread
08 / 12 / 18 / 30
M8 × 1 / M12 × 1 / M18 × 1 / M30 × 1
Mounting
S / U
S = flush (shielded); U = non-flush (unshielded)
Sensing range
020 … 250
Rated sensing range Sn in 0.1 mm steps: 020 = 2 mm, 250 = 25 mm
Output
N / P / D
N = NPN (10–30 V DC); P = PNP (10–30 V DC); D = DC 2-wire (10–60 V DC)
Contact
A / B
A = normally open (NO); B = normally closed (NC)
Connection
C2
2 m cable
Temperature class
T120 / T150 / L30
T120 = max. +120 °C; T150 = max. +150 °C; L30 = low-temperature version, min. -30 °C
Illustration — flush (S) sensors sit level with the surrounding metal; non-flush (U) sensors protrude and need a metal-free zone but reach further.
Where High Temperature Inductive Proximity Sensors Are Used
Anywhere a standard +70 °C sensor drifts, fails early or cannot be mounted far enough from the heat.
🏭
Die Casting & Foundry
Ladle, ejector and mold-position sensing next to hot dies. T150 stainless steel models keep switching where radiant heat pushes the mounting point well above 100 °C.
🧴
Plastics Injection Molding
Mold-closed, ejector-back and core-pull confirmation near hot-runner manifolds and heated platens. Flush T120 versions mount level with the platen face.
🎨
Paint Drying & Curing Ovens
Carrier and skid position detection inside drying tunnels and powder-coating cure ovens where the whole conveyor runs hot.
🧱
Kilns, Glass & Ceramics
Loader, pusher and door position on kiln cars and lehr conveyors — non-flush M30 versions add sensing distance to keep the housing away from the heat.
⚙️
Steel Mill Roller Tables
Hot-strip and billet presence detection on run-out tables, with M18/M30 housings in stainless steel for heat, scale and washdown.
❄️
Cold Storage & Outdoor
L30 low-temperature versions (min. -30 °C) for freezer conveyors, refrigerated warehouses and outdoor material-handling equipment.
Not sure which temperature class or housing you need?
Send the measured surface temperature at the mounting point, target material and available thread — our engineers reply with a part number and quotation within 24 hours. MOQ 10 pcs · samples 1–5 pcs in 5–7 days · production 3–5 weeks.
High Temperature Inductive Proximity Sensor — Frequently Asked Questions
Temperature classes, supply voltage, flush vs non-flush, part-number decoding and OEM terms.
What temperature can a high temperature inductive proximity sensor withstand?
SEGMENsensor SGI-HT inductive proximity sensors are offered in two high-temperature classes, coded in the part number: T120 = maximum operating temperature +120 °C and T150 = maximum +150 °C. The rating applies to the sensor body at the mounting point. Where the sensor sees radiant heat from a hotter object, position it so the housing itself stays within the rated class; the sensing face does not need to touch the hot part. A low-temperature version (L30, minimum -30 °C) is also available for cold-storage and outdoor equipment.
What is the difference between the T120 and T150 versions?
Both use the same stainless steel housing, sensing ranges and output options. T120 is rated for a maximum operating temperature of +120 °C and is available in M8, M12, M18 and M30. T150 is rated for a maximum of +150 °C and is available in M12, M18 and M30. If the mounting point is expected to stay below 120 °C, choose T120; for ovens, die casting, hot-runner zones or paint drying tunnels running hotter, choose T150. When in doubt, send the measured surface temperature at the mounting point with your RFQ and our engineers will confirm the class.
Which supply voltage do the SGI-HT sensors use?
Three-wire NPN (N) and PNP (P) versions operate on 10–30 V DC. The DC two-wire versions (output code D) operate on 10–60 V DC, except SGI-HT30S-160DA-C2-T120 and SGI-HT30S-160DB-C2-T120, which are 10–30 V DC. The supply voltage of every model is listed in the selection table on this page and on the datasheet.
Should I choose a flush (shielded) or non-flush (unshielded) high temperature sensor?
Flush versions (code S) can be mounted with the sensing face level with the surrounding metal, which protects the face in tight fixtures, but they have the shorter sensing range. Non-flush versions (code U) need a metal-free zone around the sensing face and give a longer sensing range for the same housing size — for example 15 mm or 25 mm on M30 non-flush versus 10 mm or 16 mm on M30 flush. In hot applications the longer range of a non-flush sensor also lets you mount it further from the heat source.
How do I read an SGI-HT part number?
Example SGI-HT12U-040NA-C2-T120: SGI = inductive proximity sensor; HT = high-temperature / low-temperature series; 12 = M12 thread; U = non-flush mounting; 040 = 4.0 mm sensing range; N = NPN output; A = normally open (NO); C2 = 2 m cable; T120 = maximum operating temperature +120 °C. B is normally closed (NC), P is PNP, D is DC two-wire, and L30 is the low-temperature version with a minimum of -30 °C.
What are the MOQ and lead time for high temperature proximity sensors?
MOQ is 10 pcs per part number. Samples of 1–5 pcs ship in 5–7 days for testing in your own machine. Production orders ship in 3–5 weeks. Our engineers reply to every RFQ within 24 hours on working days with a model recommendation and quotation. Private-label OEM marking is available on request.
Are the sensors CE certified, and what about IP rating and switching frequency?
SEGMENsensor inductive proximity sensors are manufactured under ISO 9001:2015 and carry CE and RoHS marking. IP rating, switching frequency, output current and connector alternatives to the standard 2 m cable are confirmed per model on the datasheet or in our quotation — please tell us the target material, mounting position and ambient temperature so the right variant is specified.
Related Reading
Technical Guides for Specifying Inductive Proximity Sensors
Ready to Source High Temperature Inductive Proximity Sensors from a China OEM Factory?
Tell us the temperature at the mounting point, housing size, output type (NPN / PNP / DC 2-wire) and quantity — we'll send a part number, quote and datasheet within 24 hours.
