PIEZO-RM TM   Sensor
SDI-12/RS485 Submersible
Level Sensor
FEATURES
Ranges  10, 20, 50, 100 meters - Others on request
 Unsurpassed Accuracy of  ±0.05% Total  Error Band
 Options for SDI12 or RS485 digital network.
 316 Stainless Steel /Marine Bronze Construction
 On-board Surge Protection
 User Selectable Pressure Units:  mH20, ftH20, inH20, bar, psi, mmH20, cmH20 all with read-back.
User Installed  Cables
IP68 Sealed Device   
 In-built Statistical Processing - Maximum, minimum range
Programmable Sample Periods
APPLICATIONS
Level Monitoring
Ground Water Monitoring
De-watering
Surface Water Monitoring
Well Monitoring
Reservoirs
Down Hole
Tank Level
Oceanographic Research
Water Services
Introduction
The PIEZO-RM submersible hydrostatic transducer represents the leading edge of level sensing  technology available today. The device uses a highly stable ceramic based sealed silicon-isolated sensor for the pressure measurements.  
The PIEZO-RM sensors are available with either the SDI-12 or RS-485 digital interface for communications. Both of these  interfaces are industry standard for digital communications with most data recorders and other intelligent sensors, especially in the environmental field monitoring applications. The transducer meets the demanding requirements of the UK Environment Agency Office for  accuracy specification for stage monitoring.

The PIEZO-RM sensors are intended for applications that require reliable remote operations. The sensors use advanced power management with minimal current drain, and can be daisy-chained on to a single network cable.  Enhanced addressing is supported when large numbers of sensors are to be deployed.
To provide the optimum in measurement accuracy and reliability the PIEZO-RM does not use vented signal cabling and is a complete hermetically sealed device. This removes any chance of failure due to accidental cable breaks, barometric errors due to cable elongation and the ingress of moisture due to condensation from high humidity levels and damage to the electronics.
Download Technical Specifications & User Manual
Measurement Data:
Measuring range
0 .. 10m,  0 .. 20m, 0 .. 50m, 0 .. 100m   RS-485 0 .. 200 m   0 .. 500m only
 0 .. 33ft    0 .. 66ft   0 .. 164ft  0 .. 328ft
Pressure resolution
0.05% FS - deviations of 1 mm can be measured at 10 m range
Long term stability
± 0.05 % FS max. Per year
Linearity, Hysteresis
<0.05% FS
Overload
24 hours with 1.2 times over rating

 Max 0.01% FS deviation  (Typical)
Temperature compensation range
2 - 30 Deg C under software control
 -5 to 45 Deg C internal electronic self correction
Temperature resolution
0.1 oC / 0.1 oF  
Temperature accuracy
± 0.2 oC / 0.2 oF    SDI-12 & RS-485
Units
M, ft, inch, bar, psi, oC, oF
Calibration
6 point calibration
Electrical Data
Voltage supply
SDI-12  10.5 to 16V DC        RS-485  10.5 to 16V DC
Current compensation
Idle mode
 Active / measurement
Typical values are
SDI-12  0.65 mA         RS-485  1.15 mA
 SDI-12  2.1   mA         RS-485  2.6   mA
 These values may change slightly between sensors. Use figures as a guide only.
Measuring time
    warm up
    response
As per section V.V200 ms
 500 ms
Length of data lines
 SDI-12
 RS-485

 100   m
 1000 m
SDI-12/RS-485 Address mode
Supports enhanced addressing 0 .. 9 A .. Z
General Data:
Pressure sensor
Ceramic pressure sensor
 Temperature compensated
Dimensions
102 x 22 mm  diameter - length includes noise cone
Material
316 stainless steel - standard      Marine Bronze on request
 Polyurethane - nose cone
Temperature range
-25  oC .. +70  oC (non freezing)
CE Conformity
CE conformity according to
 EN 61000-6
Lifetime
> 1x 107 cycles
Protection
IP 68
Weight
102 g
aM!
%aM!
a0tt2
2 values in time tt given by stats
aD0!
%aD0!
a+0.123+25.5
Pressure & Temperature values
aD1!
%aD1!
a + Max Press + Min Press + Max Temp + Min Temp
al!
%al!
a13KEYNESCOPRES001
identification string
aXE!
%aXE!
local XE9.81! Earths gravity
aXUT!
%aXUT
Temperature units scale/offset pre-defined
aXUT!
%aXUT!
Temperature units scale/offset pre-defined
aXSPM!
%aXSPM!
Set point measurement - from  surveyed datumn point
aXMM!
%aXMM!
Resets statistics
aXP !
%aXP !
Pressure output true / compensated
aXUP !
%aXUP !
XUPn! or XUP! n=0...N  Pressure units scale/offset pre-defined
(no action at present)
aXU!
%aXU!
XUn,vvv or XUn Set T/P scale/offset n=1..4 for custom units
aXL!
%aXL!
Calibration Date
aXN!
%aXN!
Next calibration date
aV!
%aV!
a  Verification
Standard Commands
The table below shows the basic commands used by the PIEZO-RM range of sensors.
Technical Specifications
SDI-12
RS-485
Response
Description
SDI-12 Version Sensor
PIEZO-1-SDI12      10 m range
 PIEZO-2-SDI12      20 m range
 PIEZO-5-SDI12      50 m range
 PIEZO-10-SDI12    100 m range
RS-485 Version Sensor
PIEZO-1-485      10 m range
 PIEZO-2-485      20 m range
 PIEZO-5-485      50 m range
 PIEZO-10-485    100 m range
 PEIZO-20-485    200 m range
Part No
Piezo-sensorsv1.ppp