METER PHYTOS 31, Manual

4

OpERATION

Ground
Analog output
Power

Figure 2  Stereo plug connector

The PHYTOS 31 comes standard with a 5-m cable. It may be purchased with custom cable 
lengths for an additional fee (on a per-meter basis). Cable length can be increased up to 40 m 
without significant signal attenuation. 

2.2.1  CONNECT TO METER DATA LOGGER

The PHYTOS 31 works most efficiently with METER ZENTRA, EM60, or Em50 series data 
loggers. Check the 

METER download webpage

 for the most recent data logger firmware. 

Logger configuration may be done using either ZENTRA Utility (desktop and mobile 
application) or ZENTRA Cloud (web-based application for cell-enabled data loggers).
1.  Plug the stereo plug connector into one of the sensor ports on the logger.
2.  Use the appropriate software application to configure the chosen logger port for the 

PHYTOS 31.

3.  Set the measurement interval.

PHYTOS 31 data can be downloaded from these loggers using either ZENTRA Utility or 
ZENTRA Cloud. Refer to the logger user manual for more information about these programs.

2.2.2  CONNECT TO A NON-METER DATA LOGGER

The PHYTOS 31 can be used with non-METER (third-party) data loggers. Refer to the third-
party logger manual for details on single-ended voltage measurements, power supply, and 
ground ports. Non-METER data loggers may require programming to read the PHYTOS 31. 
METER has 

a sample program 

for interfacing with Campbell Scientific, Inc. data loggers.

The PHYTOS 31 sensors can be ordered with stripped and tinned (pigtail) wires for use with 
screw terminals. Refer to the third-party logger manual for details on wiring. 

Connect the PHYTOS 31 wires to the data logger as illustrated in 

Figure 3

 and 

Figure 4

,

with 

the power supply wire (brown) connected to the excitation, the analog out wire (orange) to a 
single-ended voltage input, and the bare ground wire to ground.