User`s guide

MASSA PRODUCTS CORPORATION
Product Manual- April 24, 2012 22 M3 Wireless Ultrasonic Level Sensor
APPENDIX C
Digi Gateway & Massa M3 Sensor Placement Strategies
If you had been previously evaluating this kit in your lab
environment, it is now time to move the gateway in a permanent
location that will give the best possible wireless performance.
Typically, the tank will be in a fixed location, so it will be necessary
to place the gateway in a location where you will get the most reliable
RF performance between sensor and gateway. This may even require
the gateway to be placed outdoors in a weatherproof enclosure. To
observe the RF signal strength, program the sensor to sleep every
minute, awake for 30 seconds, and outgoing message to 1. Open the
Web UI idigi_dia under your gateway’s IP address as seen here. The
RF signal strength is reported under “radio_strength:”. Verify that
both the sensor antenna and gateway antenna are vertical. Moderate
reports are acceptable as long as the conditions don’t change as you
see in the following pages on placement strategies. Weak reports may
require a change in gateway placement or the addition of wall routers.
If there is a limitation on where the gateway can be placed, then a
Digi Wall Router (repeater) should be used. Ultimately, it is best to
keep hardware to a minimum (less wall router).
An alternative way to obtain status messages is to enable the dia setting log_status: 'true' and view the status_log.txt file
stored in the python files web UI. This setting stores the status information of the latest record of the automated message.
NOTE: The gateway is rated for -30C to +70C and is not weatherproof. The sensor is watertight when securely tightened.
In this example, a tractor trailer truck is parked between a short
storage tank and gateway. Radio signals may not be reliable.
Placing a Digi Wall Router as shown here will allow another path
around structures that could block radio signals.