Apogee Instruments SI-121-SS User manual

APOGEE INSTRUMENTS, INC. | 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA

TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM

OWNER’S MANUAL

INFRARED RADIOMETER

Models SI-111, SI-121, SI-131, and SI-1H1

(including SS models)

TABLE OF CONTENTS

Owner’s Manual ............................................................................................................................................................................... 1

Certificate of Compliance......................................................................................................................................................... 3

Introduction ............................................................................................................................................................................. 4

Sensor Models ......................................................................................................................................................................... 5

Specifications ........................................................................................................................................................................... 6

Deployment and Installation.................................................................................................................................................... 8

Cable Connectors................................................................................................................................................................... 10

Operation and Measurement ................................................................................................................................................ 11

Maintenance and Recalibration............................................................................................................................................. 16

Troubleshooting and Customer Support................................................................................................................................ 17

Return and Warranty Policy................................................................................................................................................... 19

CERTIFICATE OF COMPLIANCE

EU Declaration of Conformity

This declaration of conformity is issued under the sole responsibility of the manufacturer:

Apogee Instruments, Inc.

721 W 1800 N

Logan, Utah 84321

USA

for the following product(s):

Models: SI-111, SI-121, SI-131, SI-1H1

Type: Infrared Radiometer

The object of the declaration described above is in conformity with the relevant Union harmonization legislation:

2014/30/EU Electromagnetic Compatibility (EMC) Directive

2011/65/EU Restriction of Hazardous Substances (RoHS 2) Directive

2015/863/EU Amending Annex II to Directive 2011/65/EU (RoHS 3)

Standards referenced during compliance assessment:

EN 61326-1:2013 Electrical equipment for measurement, control and laboratory use –EMC requirements

EN 50581:2012 Technical documentation for the assessment of electrical and electronic products with respect to

the restriction of hazardous substances

Please be advised that based on the information available to us from our raw material suppliers, the products

manufactured by us do not contain, as intentional additives, any of the restricted materials including lead (see

note below), mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), polybrominated

diphenyls (PBDE), bis(2-ethylhexyl) phthalate (DEHP), butyl benzyl phthalate (BBP), dibutyl phthalate (DBP), and

diisobutyl phthalate (DIBP). However, please note that articles containing greater than 0.1% lead concentration are

RoHS 3 compliant using exemption 6c.

Further note that Apogee Instruments does not specifically run any analysis on our raw materials or end products

for the presence of these substances, but rely on the information provided to us by our material suppliers.

Signed for and on behalf of:

Apogee Instruments, April 2020

Bruce Bugbee

President

Apogee Instruments, Inc.

INTRODUCTION

All objects with a temperature above absolute zero emit electromagnetic radiation. The wavelengths and intensity

of radiation emitted are related to the temperature of the object. Terrestrial surfaces (e.g., soil, plant canopies,

water, snow) emit radiation in the mid infrared portion of the electromagnetic spectrum (approximately 4-50 µm).

Infrared radiometers are sensors that measure infrared radiation, which is used to determine surface temperature

without touching the surface (when using sensors that must be in contact with the surface, it can be difficult to

maintain thermal equilibrium without altering surface temperature). Infrared radiometers are often called infrared

thermometers because temperature is the desired quantity, even though the sensors detect radiation.

Typical applications of infrared radiometers include plant canopy temperature measurement for use in plant water

status estimation, road surface temperature measurement for determination of icing conditions, and terrestrial

surface (soil, vegetation, water, snow) temperature measurement in energy balance studies.

Apogee Instruments SI series infrared radiometers consist of a thermopile detector, germanium filter, precision

thermistor (for detector reference temperature measurement), and signal processing circuitry mounted in an

anodized aluminum housing, and a cable to connect the sensor to a measurement device. All radiometers also

come with a radiation shield designed to minimize absorbed solar radiation, but still allowing natural ventilation.

The radiation shield insulates the radiometer from rapid temperature changes and keeps the temperature of the

radiometer closer to the target temperature. Sensors are potted solid with no internal air space and are designed

for continuous temperature measurement of terrestrial surfaces in indoor and outdoor environments. SI-100

series sensors output an analog voltage that is directly proportional to the infrared radiation balance of the target

(surface or object the sensor is pointed at) and detector, where the radiation balance between target and detector

is related to the temperature difference between the two.

SENSOR MODELS

The four FOV options and associated model numbers are shown below:

Model

Output

SI-100 Series

Voltage

SI-400 Series

SDI-12

Sensor model number and serial number are located

on a label near the pigtail leads on the sensor cable. If

you need the manufacturing date of your sensor,

please contact Apogee Instruments with the serial

number of your sensor.

SI-131

SI-121

SI-111

SI-1H1

SPECIFICATIONS

Calibration Traceability

Apogee SI series infrared radiometers are calibrated to the temperature of a custom blackbody cone held at

multiple fixed temperatures over a range of radiometer (detector/sensor body) temperatures. The temperature of

the blackbody cone is measured with replicate precision thermistors thermally bonded to the cone surface. The

precision thermistors are calibrated for absolute temperature measurement against a platinum resistance

thermometer (PRT) in a constant temperature bath. The PRT calibration is directly traceable to the NIST.

SI-111-SS

SI-121-SS

SI-131-SS

SI-1H1-SS

Approximate Sensitivity

60 µV per C difference

between target and

detector temperature

40 µV per C

difference between

target and detector

temperature

20 µV per C

difference between

target and detector

temperature

40 µV per C

difference between

target and detector

temperature

Output from Thermopile

Approximately -3.3 to

3.3 mV for a

temperature

difference from -55 to

55 C

Approximately -2.2

to 2.2 mV for a

temperature

difference from -55

to 55 C

Approximately -1.1

to 1.1 mV for a

temperature

difference from -55

to 55 C

Approximately -2.2

to 2.2 mV for a

temperature

difference from -55

to 55 C

Output from Thermistor

0 to 2500 mV (typical, depends on input voltage)

Input Voltage Requirement

2500 mV excitation (typical, other voltages can be used)

Calibration Uncertainty (-20 to 65 C),

when target and detector temperature are

within 20 C

0.2 C

0.3 C

0.2 C

Calibration Uncertainty (-40 to 80 C),

when target and detector temperate are

different by more than 20 C

(see Calibration Traceability below)

0.5 C

0.6 C

0.5 C

Measurement Repeatability

Less than 0.05 C

Stability (Long-term Drift)

Less than 2 % change in slope per year when germanium filter is maintained in a clean

condition (see Maintenance and Recalibration section below)

Response Time

0.6 s, time for detector signal to reach 95 % following a step change

Field of View

22° half angle

18° half angle

14° half angle

32° horizontal half

angle; 13° vertical

half angle

Spectral Range

8 to 14 µm; atmospheric window (see Spectral Response below)

Operating Environment

-55 to 80 C; 0 to 100 % relative humidity (non-condensing)

Dimensions

23 mm diameter, 60 mm length

Mass

190 g (with 5m of lead wire)

Cable

5 m of four conductor, shielded, twisted-pair wire; TPR jacket (high water resistance, high UV

stability, flexibility in cold conditions); pigtail lead wires; stainless steel (316), M8 connector

located 25 cm from sensor head

Spectral Response

Spectral response of SI series

infrared radiometers. Spectral

response (green line) is

determined by the germanium

filter and corresponds closely to

the atmospheric window of 8-14

µm, minimizing interference from

atmospheric absorption/emission

bands (blue line) below 8 µm and

above 14 µm. Typical terrestrial

surfaces have temperatures that

yield maximum radiation emission

within the atmospheric window,

as shown by the blackbody curve

for a radiator at 28 C (red line).

DEPLOYMENT AND INSTALLATION

The mounting geometry (distance from target surface, angle of orientation relative to target surface) is

determined by the desired area of surface to be measured. The field of view extends unbroken from the sensor to

the target surface. Sensors must be carefully mounted in order to view the desired target and avoid including

unwanted surfaces/objects in the field of view, thereby averaging unwanted temperatures with the target

temperature (see Field of View below). Once mounted, the green cap must be removed. The green cap can be

used as a protective covering for the sensor, when it is not in use.

An Apogee Instruments model AM-220 mounting bracket is recommended for mounting the sensor to a cross arm

or pole. The AM-220 allows adjustment of the angle of the sensor with respect to the target and accommodates

the radiation shield designed for all SI series infrared radiometers.

Field of View

The field of view (FOV) is reported as the half-angle of the apex of the cone formed by the target surface (cone

base) and the detector (cone apex), as shown below, where the target is defined as a circle from which 98 % of the

radiation detected by the radiometer is emitted.

Sensor FOV, distance to target, and sensor mounting angle in relation to the target will determine target area.

Different mounting geometries (distance and angle combinations) produce different target shapes and areas, as

shown below.

CIRCULAR

HORIZONTAL

FOV Area (m²)

Half Angle

FOV Area (m²)

Type

Model

Half Angle

0 Deg

45 Deg

60 Deg

Type

Model

Horizontal

Vertical

0 Deg

45 Deg

60 Deg

Standard

SI-111

22°

2.069

7.627

45.211

Standard

SI-1H1

32°

13°

2.276

7.148

45.512

Narrow

SI-121

18°

1.337

4.461

18.865

Narrow

SI-4HR

16°

5°

0.403

1.15

3.341

Ultra-Narrow

SI-131

14°

0.787

2.447

8.544

A simple FOV calculator for determining target dimensions based on infrared radiometer model, mounting height,

and mounting angle, is available on the Apogee website: https://www.apogeeinstruments.com/irr-calculators.

CABLE CONNECTORS

Apogee started offering in-line cable connectors on

some bare-lead sensors in March 2018 to simplify the

process of removing sensors from weather stations for

calibration (the entire cable does not have to be

removed from the station and shipped with the sensor).

The ruggedized M8 connectors are rated IP68, made of

corrosion-resistant marine-grade stainless-steel, and

designed for extended use in harsh environmental

conditions.

Inline cable connectors are installed 30 cm from the

head

(pyranometer pictured)

Instructions

Pins and Wiring Colors: All Apogee connectors have six

pins, but not all pins are used for every sensor. There

may also be unused wire colors inside the cable. To

simplify datalogger connection, we remove the unused

pigtail lead colors at the datalogger end of the cable.

If a replacement cable is required, please contact

Apogee directly to ensure ordering the proper pigtail

configuration.

Alignment: When reconnecting a sensor, arrows on the

connector jacket and an aligning notch ensure proper

orientation.

Disconnection for extended periods: When

disconnecting the sensor for an extended period of time

from a station, protect the remaining half of the

connector still on the station from water and dirt with

electrical tape or other method.

A reference notch inside the connector ensures

proper alignment before tightening.

When sending sensors in for calibration, only send the

short end of the cable and half the connector.

Tightening: Connectors are designed to be firmly

finger-tightened only. There is an O-ring inside the

connector that can be overly compressed if a wrench is

used. Pay attention to thread alignment to avoid cross-

threading. When fully tightened, 1-2 threads may still

be visible.

Finger-tighten firmly

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