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Watts HF scientific CLX- XT - User Manual

Watts HF scientific CLX- XT
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Manual Cat #28652
REV 5 (5/2020)
OWNER’S MANUAL
CLX- XT TRO &
Chlorine Monitor
Catalog No. 28030
HF scientific
16260 Airport Park Drive
Suite 140
Ft. Myers, FL 33913
Phone: 239-337-2116
Toll Free: 888-203-7248
Fax: 239-454-0694
Email: hf.info@wattswater.com
Website: www.hfscientific.com

Table of Contents

Questions and Answers

  • H
    heathernelsonAug 4, 2025
    Why are the readings erratic on my Watts HF scientific CLX- XT Measuring Instruments?
    • L
      Lisa FosterAug 4, 2025
      Erratic readings on your Watts Measuring Instruments can be caused by: * Bubbles in the solution. To resolve this, install a bubble elimination chamber. * Debris in the flow. To resolve this, clean the T-strainer.
  • J
    John DavisAug 14, 2025
    What to do if readings are lower than expected on Watts HF scientific CLX- XT?
    • F
      franceshernandezAug 14, 2025
      If the readings on your Watts Measuring Instruments are lower than expected, it could be due to several reasons: 1. Condensate or a leaky measurement cuvette. Install a desiccant cartridge kit to fix this. 2. A dirty measurement cuvette. Clean or replace the cuvette. 3. Bad or expired reagents. Replace the reagents. 4. The buffer reagent is not being dispensed. Check the buffer lines and check valves.
  • T
    Teresa JimenezAug 25, 2025
    What to do if lower display shows MA on Watts HF scientific CLX- XT?
    • C
      Candice GrayAug 26, 2025
      If the lower display on your Watts Measuring Instruments shows 'MA', it indicates a 4-20 mA loop open. To solve this, check the wiring.

Summary

Specifications

Safety

2.1 Symbols Used In This Manual

Explains the meaning of hazard symbols (caution, notice, electrical) used throughout the manual.

Installation and Commissioning

4.1 Mounting & Site Selection

Provides guidelines for selecting a suitable mounting location and method for the instrument.

4.2 Plumbing

Details plumbing connections, pressure requirements, and tubing specifications for sample and waste lines.

4.3.1 Instrument Power

Explains instrument power supply requirements, circuit breaker placement, and connection procedures.

4.3.2 Cooling Chamber Power

Details power connection requirements for the cooling chamber, emphasizing its continuous operation.

4.3.3 RS-485

Describes the RS-485 digital interface, its communication modes, and cabling best practices.

4.3.6 4-20 mA

Explains the 4-20 mA analog output, its function, transformer isolation, and connection details.

4.4 Installing Reagents

Provides instructions for installing the buffer and indicator reagents, including activation and mixing.

Operation

5.1 Routine Measurement (No Control Options)

Describes basic operation for taking routine chlorine measurements without external control.

5.2 Routine Measurement (Modbus Control Option)

Explains routine measurement procedures when using the Modbus control option for system prompting.

5.3 Routine Measurement (Remote Standby Control Option)

Details routine measurement operation using a remote standby control signal via RSI connections.

Instrument Calibration

6.1 Slope (gain) Calibration Procedure

Provides step-by-step instructions for performing a slope (gain) calibration against a reference measurement.

6.2 Zero (offset) Calibration Procedure

Details the procedure for performing a zero (offset) calibration using chlorine-free water supply.

Instrument Configuration (CONFIG mode)

7.4 Configuring the Alarms

Describes setting up programmable alarm functions (HI, LO, Error) and their respective set points.

Troubleshooting

9.1 CLX-XT Fault Detection

Explains the four severity levels of fault detection and how faults are displayed on the instrument's LCD.

9.5 Diagnostic Chart

Provides a chart linking common instrument symptoms to their causes and recommended corrective actions (cures).

9.6 Technical and Customer Assistance

Provides HF scientific contact details for technical and customer assistance regarding the instrument.

Routine Maintenance

10.1 Maintenance Schedule

Outlines a recommended schedule for routine maintenance, including reagent checks and replacement.

10.2 Replacing or Installing the Reagents

Details preparing, installing, and replacing the buffer and indicator reagents, including activation.

Watts HF scientific CLX- XT Specifications

General IconGeneral
Accuracy±5% of reading or ±0.04 ppm
Dimensions15 x 13 x 8 inches
Measurement Range0-10 ppm
DisplayLCD
Power Supply100-240 VAC, 50/60 Hz