Model LXT-330 Universal Water Analyzer

SKU: LXT-330

LXT330 General Purpose

Model LXT330 Liquid Transmitter is a single or dual channel, universal, multi-parameter transmitter, designed for continuous online liquid measurements. It is paired with SP3 Smart sensors and is intended for use in non-hazardous, general purpose rated industrial environments. The SP3 sensor platform covers a wide range of liquid analytical measurements, such as pH, ORP, Specific Ion (pION), dissolved oxygen, free chlorine, total chlorine, conductivity, resistivity and turbidity. The LXT330 transmitter can be used with any SP3 smart sensors without additional user reconfiguration. The Universal Transmitter & Smart Sensor loop philosophy removed the need to stock for multiple instrument types. The process parameter, sensor details, serial number and calibration history are stored in the sensor’s main memory, facilitated by two-way digital communication between the sensors and transmitter. The LXT330 universal transmitter allows for up to two SP3 sensors per transmitter (contact factory for available combinations).

  • Brand


Teledyne Analytical TAI Liquid


LXT330 Configuration Builder (LXT-330-AB-CD-E)

​​LXT330 ​A ​B ​C​ ​​D ​​E
​​​​​​​​​​​​​​1st Channel

​ ​ ​ ​ ​ ​ ​ ​

​​​​​1  SP3 Digital Sensor, pH,​​​ ORP, pION, DO*, ppb DO, Conductivity, Resistivity, TSS, ODO
​​​​4  Internal Pre-amp, Digital to SGTC Conductivity/Resistivity (High Temp.)
​​​​​​​​​​​​​​​​​2nd Channel​

​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​


​​​0  No Second Channel
​​​1  SP3 Digital Sensor, pH, ORP, pION, DO*, ppb DO, Conductivity, Resistivity, TSS, ODO
​​​​​​​​​​​​​​Power &​ Relays

​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

​​00  (LOOP) 2 Wire – Single Channel Only
​​01  4 Wire – DC Power, No Relays
​​11  4 Wire – DC Power, (3) Relays
​​20  110/220 VAC Power, No Relays
​​21  110/220 VAC Power, (3) Relays

​ ​ ​ ​ ​ ​ ​ ​ ​

​0  4-20 mA & MODBUS**
​1  HART®
​2  2 x 4-20 mA & MODBUS**
​​3  2 x 4-20 mA & HART®

​00  No Mounting Hardware
​01  Universal Mounting Hardware
​02  Panel Mounting Hardware
​03  Handrail Mounting Hardware
​04  Polyester Sun-Shield with Pole Mount
​​05  Polyester Sun-Shield with Rail Mount

* Galvanic DO must be single channel due to solution ground interference
**MODBUS – AC/DC version only


Pre-pHault & Sentinel Sensor

What is pre-pHault?
It is a diagnostic feature s​howing the health of a mV sensor (pH, OPR or pION) on the transmitter
What is the requirement?
Customer would have to purchase a SENTINEL enabled electrode, only available on SP3 sensor platform.

The Teledyne 6 Point Advantage

  1. ​Unique Visual Sensor Life Indicator allows scheduled maintenance
  2. Output the Diagnostic Signal to avoid unscheduled down time
  3. Intelligent Pre-Calibrated Digital Sensors eliminate the need for field calibrations
  4. Application Specific Electrode Cartridges, pH, OPR and Specific Ion
  5. Submersible and Retractable Sensor Designs with various process fittings and lengths
  6. Various Industrial Housing Materials, 316 SS, Titanium and Hastelloy provide process compatibility
​The SENTINEL features allows the Model LXT 330 transmitter to provide Pre-pHault diagnostic information about the accuracy of a pH, ORP or pION measurement. The SENTINEL displays a filled triangular gauge that decreases proportionally to the degradation of the reference electrode, a filled gauge indicates a properly functioning measurement while the emptying gauge indicates the remaining life of the electrode. This Pre-pHault diagnostic alerts the user to potential problems and the remaining life before the measurement fails.

Model SP3 sensors for the measurement of pH, ORP and the various pIONs use replaceable electrode cartridges specific for the measured parameter. These electrode cartridges have a measurement cell (pH g​​as electrode, platinum ring or ion selective membrane) and a reference cell. The reference cell is designed to produce a standard potential independent of the solution it is immersed in. While this style of electrode is typically trouble free, there are conditions that lead to failure. Diffusion through the porous liquid junction decreases the concentration of the potassium chloride inside the electrode as the electrode ages. The decreasing concentration of potassium chloride changes the potenti​al of the cell which shows up as a dip in the measured value. Diffusion also allows chemicals in the process to infiltrate into the electrode. If these chemicals can react with silver, then the electrode will become poisoned and a large offset voltage will be generated destroying the accuracy of the measurement.

​The SENTINEL addresses these issues by including an additional sleeved silver element into the reference cell. When the electrode cartridge is now, both silver elements are at the same potential but as the electrode ages, or becomes poisoned, the bare element changes its potential in response to the electrode depletion or poisoning. The SENTINEL monitors the potential difference between the two elements and displays the value as a gauge of the electrodes remaining life. The protected silver element is still producing the correct potential but it is in danger of failing due to the changing environment inside the reference cell. This Pre-pHault indication notifies the user of the potential electrode failure before the measurement actually fails. When a model SP3 SENTINEL sensor is connected to a SP3 transmitter, the SENTINEL functions are displayed.

The Pre-pHault diagnostic is displayed on one of the model SP3s main screens along with the process variable, % 4-20 mA output and temperature. The diagnostic value can be assigned to an optional alarm relay and / or a secondary 4-20 mA output or monitored through HART® communication. The mV limit value for the diagnostic is user configurable with a default setting of 60 mV. The Model SP3 SENTINEL sensor uses diagnostic electrodes designated by part #’s 20053XX. These electrodes use a tri-axial connector with a PV connection (pH, ORP, ION), reference connection and diagnostic connection.


​Input Sensors ​​SP3 Smart Sensor
​Input Ranges​​​​ ​pH:
​-1 to 15 pH
-1500mV to +1500mV
000.1 to 999.9, Auto Ranging: ppb, ppm, ppt
000.1 to 999.9, Auto Ranging: ppb, ppm, %SAT, mg/L
0.055µS to 2.00S, Auto Ranging: µS, mS, S
0.001 to 20.00 meg-ohms
0 to 4,000 NTU, Auto Ranging: NTU, FNU, mg/L, ppm, % Solids
​Temperature ​-22° to 284°F (-30° to 140°C)​
​Accuracy ​pH:
​0.02 pH
± 1 mV
Contact factory for pION specification sheet
2% of Calibrated Range
2% of Calibrated Range
2% of Calibrated Range
4% of Calibrated Range
± 0.54°F (0.3°C)​
​Enclosure ​Polycarbonate, IP65, Weatherproof
5.7″L x 5.7″W x 3.5″D (14.48 x 14.48 x 8.89 cm)
1.6 lbs (0.75 kg)​
​Interface Ports ​1/2″ Glands, 3 nos.
​Environmental Conditions ​Ambient Temp:
DC & Loop:
Storage Temp:
Relative Humidity:
-4° to 158°F (-20° to 70°C)
-4° to 140°F (-20° to 60°C)
-22º to 185ºF (-30° to 85°C)
0 to 80% Non-Condensing​
​Display ​2.75″ x 1.5″ (128 x 64 pixels) LCD
Black/Grey background on loop powered units
Blue/White background LED back lit on AC and 4-wire DC units
​Menu Selection ​Soft Key Buttons
​Input Power ​Loop Powered, 24 VDC, 600 ohm max load (18-36 VDC @ 35 mW minimum)
4-wired 24 VDC (18-36 VDC @ 250 mW minimum)
AC (100-250 VAC, 50/60 Hz)
​Signal Outputs ​4-20 mA, Fault Condition: 3.5 mA, 22 mA or none
HART® (Optional)
Alarm Relays (Optional): Three (3) SPDT Form C, 250 VAC, 3 AMP resistive maximum relays, user configurable as Hi/Lo or Fault Alarms
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