EGT (pyrometer) amplifier · Type K thermocouple · 0 – 5 V analog out

EG5 and EG12 specifications

The output side is the same three wires as any pressure sensor — supply, ground, signal — so it wires into any analog input and calibrates with two points. Sold as the module alone: the probe and the bung it threads into are bought separately, to the specifications under Recommended to use with.

Specifications

EG5 · EG12

Parameter	EG5	EG12
Sensor	Type K thermocouple, ungrounded	Type K thermocouple, ungrounded
Range	0 – 960 °C	0 – 1250 °C
Output	5 mV/°C	4 mV/°C
Zero	0.000 V = 0 °C	0.000 V = 0 °C
Supply	5 V — the ECU's sensor rail	8 – 16 V switched, 12 V nominal
Input protection	Direct input	Series limits, RC filter and clamp diodes on both legs
Initial accuracy	±3 °C at 25 °C	±3 °C at 60 °C
Size	36.3 × 27.5 × 15.6 mm, 51.1 mm long over the zip-tie saddles, ASA-CF	44 × 34 × 16.1 mm, 58.8 mm long over the zip-tie saddles, ASA-CF

Output cable: red supply · black ground · yellow signal. Thermocouple cable: yellow + · red −. Both are cut square, the ends not stripped.

Download the datasheet (PDF) Full specifications · wiring · calibration · fitting notes

Setup guides: wiring and software setup for Speeduino, MegaSquirt, Haltech, Link, AEM, Holley EFI, MaxxECU and more.

Recommended to use with

Not in the box

The module is sold alone. Buy the probe, its fitting and any extension wire to these specifications.

A Type K probe, ungrounded, with a sealed tip and a 1/8″ NPT compression fitting. Its rating is its ceiling: one rated 1200 °C covers an EG5's full 960 °C, and an EG12's range up to 1200 °C; the EG12's full 1250 °C takes an Inconel sheath rated 1300 °C. Look for a sheath of Inconel 600, or 310 or 321 stainless, not 304, which scales and embrittles in exhaust. On arrival, an ohmmeter from either lead to the sheath should read open.
Before a turbo, a 1/4″ Inconel sheath, sealed and ungrounded, or one swaged down to 1/8″ at the tip. Look for one on a 1/8″ NPT compression fitting, so it fits the same bung.
A 1/8″-27 NPT weld-in bung, 304 stainless, not aluminium, for the probe's compression fitting to thread into. Without welding, an M18 × 1.5 male to 1/8″ NPT female adapter fits an unused O2 port. It raises the probe: check stack height and insertion depth first.
Type K extension wire, if the probe's lead needs more reach. Extend from the probe end, never with copper.