|
Humidity and Temperature Transmitters Product
Description
The
Global Water Humidity Sensor is a precise, durable unit.
Humidity sensors are composed of a solid state
capacitative element with a linear amplifier. The
humidity sensor output is 4-20 mA with a three wire
configuration. The Global Water Temperature Sensor is a
high quality, rugged instrument, precision RTD
calibrated to US National Standards. The temperature
sensor output is 4-20 mA with a two wire configuration.
Each sensor is mounted on 25’ of marine grade cable,
with lengths up to 500’ available upon request. The
electronics are completely encapsulated in marine grade
epoxy within a stainless steel housing.
The Global Water Solar Shield is a ventilated sun
shield, with high reflectiveness, low heat retention,
and low thermoconductivity. The unit is designed to
protect the Global Water Humidity and Temperature
sensors from direct sunlight that may affect the
sensor's 4-20 mA output.
What is Relative Humidity?
Air moisture content is typically described by a
relative humidity measurement. Relative humidity is the
ratio of the water vapor content to the concentration of
water vapor that the atmosphere could hold. In general,
the relative humidity will vary inversely with air
temperature so that the relative humidity is highest
when the temperature is lowest, and vice versa.
Typically after sunrise, when the air warms, the
relative humidity falls. Relative humidity is typically
given in a percentage reading. The vapor in the air is
considered at 100% relative humidity when the
concentration of water vapor in air is equal to the
water vapor concentration at saturation.
Why Measure Relative Humidity?
Relative humidity has a major effect on the
environment. Humidity readings provide a chance to
control these effects. Effects include causing
discomfort in people or animals, damaging materials in
warehouses or other storage facilities, affecting the
climates for optimal production processes, impacting the
quality of construction materials and many others.
What is Temperture and How is it Affected?
Temperature is typically measured in degrees Celsius of
Frhrenheit. To accuratly measure temperature the
temperature sensor should be shielded from direct
sunlight or precipitation and it should be adequately
ventilated. Usually "surface" air temperature is
measured approximately two meters above the surface.
The factors that affect temperature sensors include
latitude, the movement of air masses, solar radiation,
and nearby bodies of water or land. Typically solar
radiation and latitude are the biggest influences on the
temperature reading.
Humidity and Temperature Sensors Specifications
Humidity Sensor
Type: Capacitance
Output: 4-20 mA
Range: 0 to 100% RH
Accuracy: ±2% RH
Operating Voltage: 10-36 VDC
Current Draw: 3mA plus sensor output
Warm Up Time: 3 seconds minimum
Operating Temp: -40° to +55°C
Sensor Size: 1 1/2" diameter x 7"
Weight: 1/2 lb.
Temperature Sensor
Type: Precision RTD
Output: 4-20 mA
Range: -50°C to +50°C
Accuracy: ±0.2°F or ±0.1°C
Operating Voltage: 10-36 VDC
Current Draw: Same as sensor output
Warm Up Time: 5 seconds minimum
Operating Temp: -50° to +100°C
Sensor Size: 3/4" diameter x 4 1/2"
Weight: 1/2 lb.
Solar Shield
Size: 4" diameter x 8 1/2"
Weight: 1 lb.
Humidity and Temperature Transmitters Options
|
