SI-111SS
SI-111SS
OrderableInfrared Radiometer with Standard Field of View
Overview
The SI-111SS, manufactured by Apogee, is a precision infrared radiometer that determines the surface temperature of an object without physical contact. It measures both the subject's surface temperature and the sensor-body temperature. A Campbell Scientific data logger uses these measurements to calculate the correct temperature of the subject.
This radiometer features an IP67-rated, marine-grade 316L connector that allows the user to easily swap sensors for recalibration or to replace damaged cables.
Key Advantages
No physical contact necessary
Technical Description
The SI-111SS consists of a thermopile, which measures surface temperature, and a thermistor, which measures sensor body temperature. The two temperature sensors are housed in a rugged aluminum body that contains a germanium window.
Both the thermopile and the thermistor output a millivolt signal that most of our data loggers can measure. The data logger uses the Stefan-Boltzman equation to correct for the effect of sensor body temperature on the target temperature. The corrected readings yield an absolute accuracy of ±0.2°C from -10° to +65°C.
Field of View (FOV)
The SI-111SS has a 22-degree half-angle field-of-view (FOV). The FOV is reported as the half-angle of the apex of the cone formed by the target (cone base) and the detector (cone apex). The target is a circle from which 98% of the radiation viewed by the detector is being emitted.
Benefits
- Compatible with most Campbell Scientific data loggers
- Measures surface temperature continuously in the field
- Provides road surface, plant canopy, soil surface, snow surface, and water surface temperature measurements
- Avoids influencing the temperature, providing more accurate measurements
- Ideal for providing spatial averages
- Rugged construction—two temperature probes housed in an aluminum body with a germanium window
Specifications
- Sensor
- Thermopile and thermistor
- Input Power
- 2.5 V excitation
(for thermistor)
- Response Time
- < 1 s
(to changes in target temperature)
- Target Temperature Output Signal
- 60 μV per °C difference from sensor body
- Body Temperature Output Signal
- 0 to 2500 mV
- Optics
- Germanium lens
- Wavelength Range
- 8 to 14 μm
(corresponds to atmospheric window)
- Field of View (FOV)
- 22° half angle
- Operating Temperature Range
- -55° to +80°C
- Operating Relative Humidity Range
- 0 to 100% RH
- Cable Description
- 4.5 m (14.76 ft) twisted, shielded 4-conductor wire with Santoprene casing, ending in pigtails
- Absolute Accuracy
- ±0.2°C
(-10° to +65°C)
±0.5°C(-40° to +70°C)
- Uniformity
- ±0.1°C
(-10° to +65°C)
±0.3°C(-40° to +70°C)
- Repeatability
- ±0.05°C
(-10° to +65°C)
±0.1°C(-40° to +70°C)
- Diameter
- 2.3 cm
(0.9 in.)
- Length
- 6 cm
(2.4 in.)
- Weight
- 190 g
(6.7 oz)
Accessories
(5)CM230
Adjustable Inclination Mounting Kit
OrderableCABLE6PIN
26 AWG Six-Conductor Cable with M8 Six-Pin V-Coded Pin (Male) Connector
OrderableCM230XL
Adjustable Angle Mounting Kit, Extended Length
OrderableCM221
Right-Angle Mounting Kit
Orderable39131
DIN Rail Terminal Kit with 2 Terminals and 6 Wires
Orderable
Common Accessories
(4)CM230
Adjustable Inclination Mounting Kit
One of two mounting options is needed for the SI-111SS. The CM230 is one option. The CM230 Adjustable Inclination Mount can secure the SI-111SS to a mast or crossarm. An adjustable inclination mount is recommended when the target surface is on an incline.
OrderableCM230XL
Adjustable Angle Mounting Kit, Extended Length
One of two mounting options is needed for the SI-111SS. The CM230XL is one option. The CM230XL provides the same functionality as the CM230, but the CM230XL places the SI-111SS further from the pole or crossarm.
Orderable39131
DIN Rail Terminal Kit with 2 Terminals and 6 Wires
The 39131 provides the needed DIN rail terminals, separator, and wires to connect any product to a data logger or other peripheral that requires six wires for connection. This kit provides the following wires: black, light blue, green, red, white, and clear. The color-coding of these wires matches the wire coloring of the product for ease in connection, maintenance, and troubleshooting.
OrderableCABLE6PIN
26 AWG Six-Conductor Cable with M8 Six-Pin V-Coded Pin (Male) Connector
The CABLE6PIN is a cable assembly with an M8 six-pin V-coded connector on one end and flying leads on the other end. All six pins and the shield are presented as flying leads with ferrules. The six-pin connector is weatherproof and suitable for harsh environmental conditions.
Orderable
Other Accessories
(2)CM226
Solar Sensor Mounting Stand with Level and Base
OrderableCM221
Right-Angle Mounting Kit
The CM221 mounts a pipe or tube at 90° to another pipe or tube. It is typically used to attach a sensor with a vertical pipe (including most wind sensors) to a crossarm. The cast aluminum, right-angle mounting bracket has 3.8 cm (1.5 in.) U-bolts and hardware and will accommodate tubing with a 1- to 1.5-in. outer diameter.
Orderable
Ships With
(1)- Calibration Sheet
Compatibility
Mounting
The SI-111SS is often fastened to a CM200-series crossarm, a tripod or tower mast, or a user-supplied pole using a CM230, CM230XL, or CM220 mount. The CM230 and CM230XL are adjustable inclination mounts that allow the SI-111SS to be mounted perpendicular to the target surface when the target surface is on an incline. The CM230XL is similar to the CM230, but the CM230XL places the SI-111SS further from the pole or crossarm. The SI-111 may also be attached directly to a user-supplied camera tripod.
