Testomat 2000 CLT

Summary

Product identification

The product is the Testomat 2000® CLT self clean, a process photometer for total chlorine.

Intended use

The Testomat 2000® CLT is an online monitor for total chlorine concentration in the range of 0 – 2.5 mg/l (ppm) using a photometric analysis principle. It is suitable for monitoring disinfectant dosing in the drinking water field. The feed water must be clear, colorless, and free of undissolved particles.

Performance specifications

• Measuring range: 0 – 2.5 mg/l (ppm) total chlorine
• Analysis principle: Photometric analysis, DPD method according to EN ISO 7393-2
• Reagents: Requires three reagents.
• Measuring time: Approx. 1 minute (without flush time).
• Cleaning: Measuring chamber is cleaned after a pre-set number of analyses.
• Operation: Menu-driven via a plain text display.
• Units: Freely selectable in ppm or mg/l.
• Dosing: Precise piston-dosing pump.
• Analysis initiation:
  • Automatic interval operation (Interval pause adjustable from 0 to 99 minutes)
  • External control
  • Volume controlled (water meter)
• Limit values: Two independent limit values with hysteresis (1, 2 or 3 bad analyses) and adjustable switch functions.
• Measuring points: Monitoring of two measuring points (change-over via external solenoid valves).
• Documentation: Internal error documentation.
• Service: Programmable service address.
• Maintenance: Programmable maintenance interval for a maintenance request.
• Reagent storage: 500 ml reagent storage bottle.
• Optional interfaces:
  • 0/4-20 mA or 0/2-10 V
  • RS 232 for a log printer

Installation

Operating pressure

The instrument is factory set for an operating pressure range of 1 to 8 bar. For operation in the range of 0.3 to 1 bar, the flow controller valve body must be removed.

General installation requirements

• Install in a location protected against dripping or splash water, dust, and aggressive substances (e.g., in a switch cabinet or on a wall).
• Install vertically and without mechanical stress.
• Install at a vibration-free site.
• Keep the water inlet hose as short as possible (max. 5 m).
• Ensure sufficient space on the left-hand side to open the door.
• Drill mounting holes and attach the instrument using three screws.
• Connecting cables should be as short as possible and installed separately from power cables.
• Connect to the protective earth conductor (for 230/115 VAC).
• Protect against interference voltages using a mains filter.
• Shield against strong electromagnetic fields.

Water inlet and outlet

• Water pressure: Must be between 0.3 bar and 8 bar. Avoid strong pressure fluctuations.
• Water temperature: Must be between 10 °C and 40 °C. For temperatures above 40 °C, a KCN type cooler should be installed.
• Water inlet connection: Standard plug connector for plastic hoses 6/4 x 1 (external diameter 6 mm/internal diameter 4 mm, wall thickness 1 mm).
  • Install the branch line connection directly after the water treatment plant.
  • Lay the branch line connection vertically upwards.
  • Install a manually operated shut-off valve.
  • Use an opaque plastic hose (max. length 5 m).
  • Flush the inlet to remove dirt particles.
  • For operating pressure 0.3 to 1 bar or supply via a booster pump, remove the valve body from the controller and filter housing. The pump should have a feeding capacity of 25 to 35 litres/hour and be resistant to the medium.
• Water outlet connection: Connect to an outlet hose (internal diameter 12 mm). Lay the hose without backwater development and any syphoning effect to the drain, e.g., via an open funnel.

Connecting power and devices

• Always disconnect the relevant plant parts before installation.
• Use tested cables with sufficient cross-sections.
• Connect mains voltage according to the rating plate (24 V / 115 V / 230 V).
• Connect plant components to the output terminals of relays 1 to 19.

Connecting inputs and outputs

• Start input (Terminals 20, 21): External analysis start. Only connect isolated normally open contact.
• Stop input (Terminals 22, 23): External analysis stop. Only connect isolated normally closed/open contact.
• IN1 input (Terminals 24, 25): Universal input 1. Only connect isolated normally closed/open contact.
• IN2 input (Terminals 26, 27): Universal input 2 (water meter). Only connect isolated normally open contact.
• OUT (Terminals 28, 29): 0/4 - 20 mA galvanically separated or serial interface RS232.

Commissioning

Reagent insertion

1. Open the lower housing door.
2. Remove the cap from the reagent bottle.
3. Assemble the screw cap with hole and insert for the screw cap.
4. Screw the hose connector of the intake hose into the insert.
5. Place the insert with the intake hose into the reagent bottle.
6. Screw the screw cap onto the reagent bottle.

Extracting reagent

1. Switch the instrument on and press "STANDBY".
2. The pump automatically extracts reagent.
3. To ensure reagent availability for initial analyses, fill the intake hose and transport hose up to the measuring chamber.
4. Press the "manual" key several times until the hoses are filled.
5. If necessary, manually tighten hose connectors if bubble formation occurs.

Opening water inlet

1. Open the lower housing cover.
2. Slowly open the manually operated shut-off valve.
3. Ensure water-conducting parts are not leaky.
4. It should take 2 to 6 seconds to fill the measuring chamber.

Functions of the operating and display elements

Display functions

• Limit value status displays (1, 2): Illuminate red if limit value is reached or exceeded; green if below the limit value. Display 1 for LV1, Display 2 for LV2. Switch function 4 is inverse. Switch function 5: both displays green if measured value is within the range of LV1 and LV2.
• Text display (4 lines): Shows current analysis result, statuses, and programming data. Lines 2 and 3 display the current measured value for measuring point 1 (M1) and 2 (M2). Value exceeding the measuring range is indicated by ">". Line 4 displays set limit values LV1 and LV2.
• Alarm (red) (3): Indicates malfunctioning/error message or warning message.
• Maintenance message (yellow) (4): Indicates current maintenance requests.
• Status display (line) (5): Six displays indicate the current instrument and analysis status (e.g., Inlet valve, Analysis running, Outlet valve, Dosing message, Analysis stop).

Operating elements and function keys

• "manual" key: Starts an analysis manually.
• "STANDBY" key: Puts the instrument into standby mode (automatic analyses are not carried out).
• "Horn" key: Acknowledges error and warning messages.
• "M" key: Opens the programming menu for settings.
• "i" key: Calls up instrument information and settings.
• Programming keys (cursor block): Navigate menus, select functions, and enter data.

Operating system

Date, time, and weekday input

This is performed via the "M" key to access the menu, selecting "Date/Time of day", and then entering the specific date, time, and weekday using the cursor keys and "ENTER".

Password protection and basic program

A four-digit password, which is the current time in reverse order, is required to access the basic program for settings and data entry.

Selecting the operating mode

The following operating modes can be selected under "Mode of Operation":

• Time Controlled: Analysis interval is determined by programmed interval pause and flush times, plus analysis duration.
  • Interval pause: Adjustable from 0 to 99 minutes.
  • Internal flush time: Adjustable in seconds.
  • External flush time: Adjustable in seconds.
• Volume Interval: Analysis is carried out once a programmed water quantity has been measured.
  • Water meter constant: Adjustable (e.g., 100 litres/impulse).
• Volume control/Time priority: Combines volume control with a time priority for analysis triggering.
• External analysis start: Analysis is initiated via a contact at the start input. The analysis interval can be interrupted by a contact at the stop input.

Selecting the display unit

The unit of the displayed value can be programmed as either mg/l or ppm.

Parameter selection

You can measure either free chlorine or total chlorine.

• Total chlorine: Reagents A, B, and C must be connected.
• Free chlorine: Reagents A and B must be connected. Reagent C tube must be disconnected and the hole closed with a blind plug.

Entering further basic program data

Internal flushing

• Purpose: Ensures the analyzed sample represents the current value. Recommended for longer out-of-operation periods or long analysis intervals.
• Setting: Flush time is adjustable in seconds within the "FLUSH TIMES/INTERVAL" menu.
• Note: The analysis interval depends directly on the programmed flushing time. A minimum of 10 seconds is recommended for connections longer than 3 m with a 6 mm internal hose diameter.

External flushing

• Purpose: Used for very short analysis intervals, long sampling lines, or lines with large diameters. Prevents incorrect measurements caused by sample mixing when monitoring two measuring points.
• Connection: Connect the external flush valve to the "Flush" outlet.
• Setting: Flushing time is adjustable in seconds within the "FLUSH TIMES/INTERVAL" menu.

Interval pause

• Purpose: Determines the interval between two analyses when using timer-triggered analysis.
• Setting: Adjustable in minutes (0 to 99 minutes) in the "FLUSH TIMES/INTERVAL" menu.

Limit value monitoring

• Allows programming of limit values on a continuous scale.
• Two limit value outputs (LV1, LV2) are available for monitoring.
• Outputs can be programmed independently.
• If monitoring two limit values, LV1 and LV2 are permanently allocated to these limits.
• If monitoring two measuring points, LV1 and LV2 are permanently allocated to these measuring points.
• Setting: Limit values are entered in the "LIMIT VALUES" menu.

Hysteresis

• Purpose: The limit value output only switches after the first, second, or third "bad" analysis, increasing evaluation reliability.
• Setting: Adjustable (1, 2, or 3 analyses) for LV1 and LV2 independently in the "HYSTERESIS LV1" or "HYSTERESIS LV2" menus. The basic setting is 1.
• Note: Hysteresis is reactivated once the value falls below the limit value. Switch function 4 is inverse. With switch function 5, hysteresis occurs if LV1 is exceeded and LV2 is not achieved.

Switch functions of the limit value outputs LV1 and LV2

• Switch function 0, duration: Output relay reacts when the limit value is exceeded and drops out when the value falls below it.
• Switch function 1, impulse: If the measured value exceeds the limit value... (truncated).

Disclaimer: Extraction may miss figures, footnotes, or revisions; contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror