YDOC WDL314 TELEMETRY UNIT

WDL314

The WDL314 is a compact, water level logger with telemetry, designed to fit in the top of a 50mm well cap. Fore more information, refer to the  WDL314 brochure.
The unit is IP68 rated with all seals being fitted with o-rings. To ensure data integrity, the WDL314 stores readings on a 4GByte micro SD card.

The RTU is available in two versions: the WDL314DS and WDL314AD. The WDL314DS has a single pulse input as well as a serial port which may be used to connect to SDI-12 or MODBUS sensors (RS232 or RS485).The WDL314 AD has 2 off analogue voltage input, 2 4-20mA inputs and a pulse input..
A 7 pin Hirschmann connector on the bottom of the RTU connects to the sensors..
A barometric pressure sensor is incorporated on to the main PCB, allowing the unit to be used with cheaper, non-compensated (absolute)  hydrostatic level sensors.   A breather vent on top of the case prevents moisture build-up and ensures the pressure sensor is exposed to the external air pressure. The barometric pressure compensation is performed in the RTU.

Lithium Battery

Power for the WDL314 comes from a D sized, lithium thionyl battery. We recommend high quality batteries such as the SAFT LSH20, as cheaper “bobbin” cells can not supply the current needed for the modem.
Battery life will depend on the sensor read rate, sensor power consumption and transmission interval, but in typical level logging applications, 12 months can be expected.
The battery can be changed by unscrewing and removing the top cap, while the unit remains in the well head.

Communications

By default the RTUs send data to a computer running the YDOC Insights software via a TCP-IP connection. If you want to send the readings to your own server, then install  YDOC’s TCP server module. It will collect the readings from the RTUs and also allow you to open a remote comms session for configuration and testing. The data can be downloaded in YDOC’s native format, in CSV format or in JSON format  The RTUs can also send data to an FTP server or as an attachment to an Email. These transfers can be used in isolation or in tandem.
 

Calculated Channels

Once you have configured the RTU, you can then create new calculated channels which are based on the values of one or more of the existing channels. The calculation module supports a range of 1, 2 and 3 variable functions and can utilise any existing sensor as an input.
There are also occasions where you will need to perform aggregation, for example when calculated average, maximum and minimum wind speeds. To this end, the RTUs also support Aggregated channels. Simply select the input channel, choose the scanning period and then decide on the calculations you wish to perform. The aggregated values then become available as saved channels.
 

Alarms

Alarms may be set on the value of any of the internal or external sensor channel, or on the value of a calculated channel . Two levels of alarm are available for both low and high conditions. When an alarm is triggered the units may send an SMS to one or more recipients. Further alarms may be generated from within the YDOC Insights software once the data reaches it

MQTT

MQTT (Message queuing telemetry transport) is an efficient, open protocol for exchanging sensor data. Clients (RTUs) which are attached to sensors, send  data to a Broker, which subscribes to the message or data stream. Similarly applications can use MQTT to read in data for presentation to end users. MQTT has quickly become the protocol of choice in the rapidly growing Internet of Things (IoT) sector. By turning on the MQTT output option in the RTU you can now send your current or logged readings to any MQTT friendly application - be it one running on a Cloud Server or on your Smart Phone.