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CruzPro PY30 Digital Exhaust Temperature Pyrometer and Alarm

The PY30 pyrometer displays engine exhaust gas temperature in degrees F or C. It comes with an 1100 deg C type K thermocouple. Low and High temperature alarms can be set over the entire range of the instrument. When activated, the PY30 built-in 85 dB alarm will sound and the display will flash. The alarms can be enabled or disabled with a single key press. Five levels of backlighting can be selected and all set-up, calibrations constants, alarm values, an Max. temperature seen is saved to non-volatile memory. Data is output on an NMEA 0183 compatible serial data output.

All constants and calibrations are pre-set during manufacture but you may alter these settings to suit your particular needs. Calibrations can be altered over a wide range using the front-panel switches. All information is automatically saved to non-volatile memory.

With a press of the button you can display exhaust gas temperature (in deg F or C), High and Low temperature alarm set-points, and Maximum temperature seen (since last reset).

The PY30 draws only 0.017 amps and 5 levels of backlight (including OFF) can be selected from the front panel and is saved to non-volatile memory.

The PY30 outputs temperature on the standard NMEA 0183 serial data line at 4800 BAUD. This ASCII information can be used to log engine performance or repeat the display information elsewhere.

PY30 Connection Diagram

PY30 Connection Diagram

The stock thermocouple shipped with the PY30 is a 150mm long 310 stainless steel mineral filled 3mm diameter isolated thermouple. The body (Pot end where the wires exit) is 25mm long and threaded with a M8x1mm thread.
The "Pot" end of the thermocouple body should be mounted on a suitable surface which does not exceed 200 deg C using an appropriate bracket and nut.
The probe tip is flexible and can be gently bent to be inserted into the exhaust elbow about 10mm depth using a 3mm I.D. compression gland. The probe tip should not be inserted too far or exhaust gas buffeting can cause metal fatigue of the 3mm thin probe. The maximum tip temperature is 1100 deg C (2000 deg F).
The 3mm compression gland (not supplied) can be purchased from Farnell - an international company (http://www.farnell.com). Part numbers are 708-8218 (brass) or 254-642 (stainless).
Any isolated K-type or J-type thermocouple can be used with the PY30. Be sure to use an isolated thermocouple (the two wires coming from the thermocouple are electrically isolated from the metal thermocouple body).
The wires exiting the thermocouple pot end are short - only 150mm long. You will need an extension cable between the thermocouple and the PY30 display head. The electrical connections created by connecting the extension cable wires to the thermocouple wires will each create a new "thermocouple junction". If you use K-type thermocouple extension leads then the voltage created by the two new junctions will cancel (if wired correctly) and have no effect on the displayed temperature readings. If the temperature variations of the additional thermocouple junctions are not excessive you might be able to use standard copper wire for the extension cable.