Wireless Grains Per Pound Sensor

Wireless Grains Per Pound Sensor
Grains Per Pound Sensor
Technical Overview
General Description
Monnit Sensors Core Specifications
The wireless grains per pound sensor measures the
mass in grains of H2O in otherwise dry air. Put simplistically, the measurement is the weight of water in air. This
sensor uses a calibrated humidity sensor to obtain the
absolute humidity at the current temperature and converts that value into the Grains per Pound measurement
• Measures grains of moisture per pound of air.
• Free iMonnit basic online wireless sensor monitoring and notification system to configure sensors,
view data and set alerts via SMS text and email.
Power: Replaceable 3.0 V coin cell battery
Communication: RF 900, 920, 868 and 433 MHz
Dimensions: 1.775” x 1.040” x 0.785”
Antenna: 4” wire antenna
Operating Temperature: -7° to 60°C (20° to 140°F)
Device Range: 250 - 300 ft. non-line-of-sight*
Battery Life: At 1 hour heartbeat setting, coin cell battery will last ~ 1-2 years.**
* Actual range may vary depending on environment.
** Battery life is determined by sensor reporting
frequency and other variables.
Principle of Operation
1.040 in
(26.416 mm)
The wireless grains per pound sensor uses a highly accurate RH sensor to measure the weight of water in air.
The information is then sent to the iMonnit Online Sensor
Monitoring and Notification System. The system calculates the information gathered then displays the data
on-screen or it can be exported as a data sheet or graph.
Notifications can be set up through the online system to
alert the user when defined thresholds have been met or
1.775 in
(45.085 mm)
Power Options
Example Applications
Sensors are powered by a replaceable 3.0 V coin cell
battery. Optional AA battery powered sensors are available. The AA version of these sensors are larger in size
(3” [L] x 2.1” [W] x 1.2” [H] ) and include two long-life AA
Height: 0.785 in
(19.939 mm)
Greenhouse humidity monitoring.
Agriculture environmental monitoring.
Art gallery and museum environmental monitoring.
Humidor monitoring.
General weather and environmental monitoring.
It is recommended that unless you are using the AA
battery solution, you set heartbeat to no faster than one
hour to preserve battery life.
The Leader in Low Cost Wireless Sensors
Technical Specifications
Supply Voltage
2.0 - 3.6 VDC
Current Consumption
0.7 µA (sleep mode)
2 mA (radio idle/off mode)
2 mA (measurement mode)
25 mA (radio RX mode)
35 mA (radio TX mode)
Operating Temperature Range (Board Circuitry and Coin Cell)
-7°C to +60°C ( 20°F to +140°F )**
Optimal Battery Temperature Range (Coin Cell)
+10°C to +50°C ( +50°F to +122°F )
± 1.8% under normal conditions ( 10% - 90% RH )
RH Operating Range
0 – 100% RH
RH Response Time
8 sec ( tau 63% )
900 MHz product; FCC ID: ZTL- RFSC1 and IC: 9794ARFSC1. 920 MHz product; ARIB STD-T108 R210-103733.
868 and 433 MHz product tested and found to comply with:
CISPR 22:2008-09 / EN 55022:2010 - Class B and ETSI
EN 300 220-2 V2.4.1 (2012-05).
* At temperatures above 100°C, it is possible for the board circuitry to lose programmed memory.
RH (%RH)
± 10
maximal tolerance
typical tolerance
T (°C)
± 3.0
± 2.5
maximal tolerance
typical tolerance
± 2.0
± 1.5
± 1.0
± 0.5
± 0.0
60 70 80 90 100
Relative Humidity (%RH)
Temperature (°C)
This product is designed for application in an ordinary environment (normal room temperature, humidity and atmospheric
pressure). Do not use this sensor under the following conditions as these factors can deteriorate the product characteristics and cause failures and burn-out.; corrosive gas or deoxidizing gas - chlorine gas, hydrogen sulfide gas, ammonia gas,
sulfuric acid gas, nitric oxides gas, etc.), volatile or flammable gas, dusty conditions, under low or high pressure, wet or
excessively humid locations, places with salt water, oils chemical liquids or organic solvents, where there are excessively
strong vibrations, other places where similar hazardous conditions exist.
Use this product within the specified temperature range. Higher temperature
may cause deterioration of the characteristics or the material quality of
this product.
For more information about our products or to place an order, please
contact our sales department at 801-561-5555.
Visit us on the web at www.monnit.com.
Monnit, iMonnit and all other trademarks are property of Monnit, Corp. © 2009-2015 Monnit Corp. All Rights Reserved.
Monnit Corporation
4403 South 500 West
Murray, UT 84123
MD-028-2C (08/15)
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