Optris CT 4M High-Speed IR Sensor

Fits fixed non-contact temperature measurement of fast or small targets when you need a compact Ø14×28 mm sensing head with 90 µs exposure (90%), 0…500 °C scalable range, and 2.2–6 µm spectral band.

Key advantages

Fast IR response — exposure 90 µs (90%) and response 300 µs (90%) on the CT 4ML line.
Compact sensing head — small head for tight machine mounts with separate electronics.
Published accuracy — ±(0.3% of reading + 2 °C) on the CT 4M family values used here.
Industrial integration — analog / digital options per ordered configuration for PLC use.

Typical applications

High-speed process surfaces where contact probes cannot keep up.
Small targets on packaging, plastics, or metal lines needing fixed IR.
Machine builds that separate the sensing head from the electronics box.

Selection guide

Measuring range — 0 °C … 500 °C (scalable via keys/software).
Spectral range — 2.2 – 6 µm.
Optical resolution — 10:1 (90% energy).
Accuracy — System accuracy ±(0.3% of reading + 2 °C) at 23 ±5 °C ambient.
Repeatability — ±(0.1% of reading + 1 °C).
Response — Exposure 90 µs (90%); response 300 µs (90%).
NETD — 120 mK.
Emissivity — 0.100 – 1.100 adjustable.

Common mistakes

Specifying for glass or high-temp metals outside the 2.2–6 µm / 0…500 °C envelope — lock spectral band and span to the target.
Ignoring 10:1 optics vs spot size at working distance.
Assuming relays are included — dual analog / TC K / alarm / USB are listed; relays are optional.
Overlooking head ambient 0–70 °C when mounting near hot process — may need cooling accessories (confirm on RFQ).
Confusing exposure 90 µs with response 300 µs (both at 90%).

When to RFQ / what to tell us

Target material/emissivity, temperature span within 0…500 °C, and required spot size vs 10:1 at working distance.
Output (0/4–20 mA, 0–5/10 V, TC K, alarm, optional relays, USB) and supply (8–30 VDC or USB).
Head/electronics ambient, IP65 mounting, quantity, ship-to.

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Specs

Spec	Value
SKU	48276
Brand	Optris
Model	CT 4M Infrared Temperature Sensor
Product type	infrared_thermometer
Measuring range	0 °C … 500 °C (scalable via keys/software)
Spectral range	2.2 – 6 µm
Optical resolution	10:1 (90% energy)
Accuracy	System accuracy ±(0.3% of reading + 2 °C) at 23 ±5 °C ambient
Repeatability	±(0.1% of reading + 1 °C)
Response time	Exposure 90 µs (90%); response 300 µs (90%)
NETD	120 mK
Emissivity	0.100 – 1.100 adjustable
Output signal	Dual analog 0/4–20 mA, 0–5/10 V, thermocouple K, alarm; optional relays; USB built-in
Supply voltage	8–30 VDC or 5 V USB; max ~1.2 W
Ambient temperature	Sensing head and electronics 0–70 °C operating; storage −40–85 °C
Protection rating	IP65 (NEMA-4)
Dimensions	Head Ø14 mm × 28 mm; head mass ~40 g; electronics ~420 g

Documents

Optris CT 4ML datasheet (PDF)

FAQ

Q: How fast is CT 4M? A: Exposure 90 µs (90%) and response 300 µs (90%) on the CT 4ML published values.

Q: What outputs are available? A: Dual analog 0/4–20 mA, 0–5/10 V, thermocouple K, alarm; optional relays; USB built-in.

Q: What should I send for a quote? A: Target material/emissivity, span, spot size, output, ambient, quantity. Compatible with systems using Optris CT 4M / CT 4ML — we do not claim authorized-dealer status.