CALEX PCAN21 Output Signal Infrared Temperature Sensor User Guide
- June 15, 2024
- CALEX
Table of Contents
PyroCAN Series
Operators Guide
PCAN21 Output Signal Infrared Temperature Sensor
PyroCAN infrared temperature sensors measure temperatures from -20°C to 1000°C and transmit the reading digitally via a Raw CAN interface.
SPECIFICATIONS
Temperature Range vs Field-of-View table
| Field of View | Model Number |
|---|---|
| 2:1 | PCAN21 |
| 10:1 | PCAN201 |
| Interface | Raw CAN |
| --- | --- |
| Accuracy | ±1% of reading or ±1ºC whichever is greater |
| Repeatability | ± 0.5% of reading or ± 0.5ºC whichever is greater |
| Emissivity | 0.2 to 1.0, adjustable via CAN |
| Response Time, t90 | 200 ms (90% response) |
| Spectral Range | 8 to 14 μm |
| Supply Voltage | 12 to 24 V DC |
| Supply Current | 50 mA max. |
| Baud Rate | 250 kbps |
| Format | see PROTOCOL |
MECHANICAL
Construction| Stainless Steel
Dimensions| 18 mm diameter x 103 mm long
Thread Mounting| M16 x 1 mm pitch
Cable Length| 1 m
Weight with Cable| 95 g
ENVIRONMENTAL
Environmental Rating| IP65
Ambient Temperature| 0ºC to 90ºC
Relative Humidity| 95% max. non-condensing
ACCESSORIES
A range of accessories to suit different applications and industrial
environments is available. These may be ordered at any time and added on-site.
The accessories consist of the following parts .
Fixed mounting bracket Adjustable mounting bracket Air purge collar Laser
sighting tool Protective plastic window with stainless steel holder Mounting
bracket with continuous laser sighting
OPTIONS
The following options are available. Options are factory installed and must be
ordered with the sensor.
Air/water cooled housing Certificate of calibration Longer cable
OPTICAL CHART
The optical chart below indicates the nominal target spot diameter at any given distance from the sensing head and assumes 90% energy.
INSTALLATION
The installation process consists of the following stages:
Preparation Mechanical installation Electrical installation Please read the
following sections thoroughly before proceeding with the installation.
PREPARATION
Ensure that the sensor is positioned so that it is focused on the target only.
DISTANCE AND SPOT SIZE
The size of the area (spot size) to be measured determines the distance
between the sensor and the target. The spot size must not be larger than the
target. The sensor should be mounted so that the measured spot size is smaller
than the target.
AMBIENT TEMPERATURE
The sensor is designed to operate in ambient temperatures from 0°C to 90°C..
For ambient temperatures above 90°C, an air/water-cooled housing will be
required.
Avoid thermal shock. Allow 20 minutes for the unit to adjust to large changes
in ambient temperature.
ATMOSPHERIC QUALITY
Smoke, fumes or dust can contaminate the lens and cause errors in temperature
measurement.
In these types of environment the air purge collar should be used to help keep
the lens clean.
ELECTRICAL INTERFERENCE
To minimise electromagnetic interference or ‘noise’, the sensor should be
mounted away from motors, generators and such like.
WIRING
Check the distance between the sensor and the connected instrumentation. If
necessary, the sensor can be ordered with a longer cable attached.
POWER SUPPLY
Be sure to use a 12 to 24 V DC (50mA max.) power supply.
MECHANICAL INSTALLATION
All sensors come with a 1m cable and a mounting nut. The sensor can be mounted
on brackets or cut outs of your own design, or you can use the fixed and
adjustable mounting bracket accessories which are shown below.
Note: The sensor must be grounded at only one point, either the cable
shield or the sensor housing.
AIR/WATER COOLED HOUSING
The air/water cooled housing shown below allows the sensor to withstand high
ambient temperatures.
It is equipped with two 1/8” BSP fittings. Water temperature should be 10°C to
27°C for efficient cool- ing. Chilled water below 10°C is not recommended. To
avoid condensation, the air purge collar should be used with the water-cooled
housing. Water flow rate should not be more than 0.5 to 1.5 litres/min.
AIR PURGE COLLAR
The air purge collar below is used to keep dust, fumes, moisture, and other
contaminants away from the lens. It must be screwed in fully. Air flows into
the 1/8” BSP fitting and out of the fraperture. Air flow should be no more
than 5 to 15 litres/min.
Clean or ‘instrument’ air is recommended.
ELECTRICAL INSTALLATION
Wire colour codes:
| Brown | PWR+ | +12 to +24 V DC |
|---|---|---|
| White | PWR- | 0 V |
| Yellow | OP+ | CAN output + |
| Green | OP- | CAN output – |
PROTOCOL
- The sensor transmits an 8-byte message every 200 ms containing the ambient and object temperatures in °C.
- The first 4-bytes are the object temperature encoded as a floating-point.
- The second 4-bytes are the ambient temperature encoded as a floating-point.
- This message is sent to the CAN ID stored in non-volatile memory. The ID is persistent between power cycles.
- The CAN ID may be set to a value from 0 to 2048 (0x0 to 0x800) as a 4-byte unsigned integer.
- The emissivity setting may be set to a value from 0.2 to 1.0 as a 4-byte floating-point.
- These floating-point values can be decoded simply using an IEEE 754 binary-to-decimal converter.
References
Read User Manual Online (PDF format)
Read User Manual Online (PDF format) >>