SYCON 2802

The SYCON 2802 is a titration device for measuring water hardness or carbonate hardness.
Compared to the SYCON 2702, the Onlie analyzer has two additional relays, which makes a large number of new connection variants possible. There is also an RS485 interface with Modbus RTU protocol and a further input contact. An additional programmable second limit value enables the monitoring of a water overlap or a pre-alarm. The additional relay contacts make it possible to control an external cooling water valve for a sample cooler.

SYCON 2802 – Premium titration device for water hardness with Modbus RTU

Why the SYCON 2802?

In complex water treatment plants, the highest demands are placed on process monitoring. In addition to the precise measurement of water hardness, measured values must be transmitted in real time to higher-level control systems (PLC, SCADA, building management systems). Several limit values enable a differentiated response – for example, a pre-alarm if slightly exceeded and a safety shutdown if critical values are reached.

The SYCON 2802 is the flagship of the SYCON series and combines all the functions of the SYCON 2702 with additional interfaces and control options. It is the first choice for demanding industrial applications where seamless integration into plant automation and complete process documentation are required.

What is the SYCON 2802?

The SYCON 2802 from RLS Wacon is a fully automatic online titration device for the quantitative measurement of total hardness or carbonate hardness (acid capacity KS 4.3) in process and industrial water. Compared to the SYCON 2702, it offers two additional relay outputs (4 in total), an RS485 interface with Modbus RTU protocol, a second digital input and a second, freely programmable limit value.

The second limit value enables differentiated monitoring: for example, limit value 1 can be configured as a pre-alarm and limit value 2 as the main alarm. Alternatively, a water overlap can be monitored with two limit values – with a lower and an upper threshold value for the desired mixing hardness.

How does the SYCON 2802 work?

The measuring principle is identical to the SYCON 2702: colorimetric titration method. A water sample is automatically fed into the measuring cell and the Reagent (H25 series or C25 series) is added step by step. The maintenance-free RGB full color sensor evaluates the color change and calculates the exact hardness concentration. The analysis time is approx. 3 minutes and the indicator consumption is less than 0.05 ml per analysis.

The decisive difference lies in the extended interfaces: Via the RS485 interface with Modbus RTU protocol, measured values and device parameters can be queried directly from a PLC. The analog output (0/4-20 mA) is also available. Four relay outputs offer maximum flexibility for signaling and system control.

Extended functions compared to the SYCON 2702

Function	SYCON 2702	SYCON 2802
Relay outputs	2	4
Programmable limit values	1	2
Digital inputs	1	2
RS485 / Modbus RTU	–	Yes
Cooling water valve control	–	Yes (via relay 4)
Analog output 0/4-20 mA	Yes	Yes

Advantages of the SYCON 2802

Exact determination of measured values by titration method
Quantitative determination of water hardness with ± 5 % accuracy and ± 2.5 % repeatability
RS485 interface with Modbus RTU
Direct query of measured values and device parameters by a PLC – seamless integration into the system automation
Two freely programmable limit values
Pre-alarm and main alarm or monitoring of a water overlap with lower and upper threshold value
4 potential-free relay outputs
Limit value 1, limit value 2 / indicator level, device fault, analysis active / cooling water valve
Analog output 0/4-20 mA in addition to Modbus
Parallel measured value output via analog and digital interface
2 digital inputs
External analysis start, water meter, flow monitor, interval reset, remote reset – flexibly configurable
Control of an external cooling water valve
Relay 4 can be configured to automatically control a sample cooler valve
Self-calibrating full color sensor
No manual calibration – automatic compensation of ambient light, contamination and turbidity
Very low indicator consumption
Less than 0.05 ml per analysis – at least 10,000 analyses per 500 ml bottle
9-language graphic display with SD card
Complete logging, installation wizard, software updates via SD card

Field of application

The SYCON 2802 is the first choice for demanding applications where seamless integration into higher-level control systems is required:

Area of application	Description
Industrial water treatment	Full connection to PLC/SCADA via Modbus RTU and 4-20 mA – Measured values, alarms and device status in real time
Water blending	Two limit values monitor the upper and lower threshold values of the desired mixing hardness
Complex softening systems	Pre-alarm (limit value 1) and main alarm (limit value 2) for graduated reactions in the event of hardness breakthrough
Steam boiler with sample cooler	Automatic control of the cooling water valve via relay 4 – no external timer required
Reverse osmosis systems	Quantitative monitoring with remote reset option via the second digital input

Requirements for the sample water

Parameters	Requirement
pH value	4-10
Iron (Fe)	< 3 ppm
Copper (Cu)	< 0.2 ppm
Aluminum (Al)	< 0.1 ppm
Manganese (Mn)	< 0.2 ppm
Acid capacity KS 4.3	< 5 mmol/l
Properties	Clear, colorless, free of solids, free of gas bubbles

Installation and commissioning

Mount the appliance on a dry, easily accessible wall – upright, with free access to the drain
Make water connections: Inlet and outlet via 6 mm hose
Electrical connections via the cable glands (4 pieces): Supply voltage, 4 relay outputs, analog output, RS485, 2 digital inputs
Connect the RS485 bus (for Modbus RTU connection): Configure bus address and baud rate in the menu
Insert the Reagent of the H25 series or C25 series and insert the suction lance
Start installation wizard – step-by-step guide through all settings including both limit values
Start the first analysis run and check the measured value

Tip for the installation

Use the Modbus RTU interface to remotely query all device parameters via your PLC. This means that measured values, limit value status, device status and indicator supply can be monitored centrally – without additional cabling for individual signals. The fourth relay can be configured to automatically control a cooling water valve for the optional sample cooler.

Important notes

Only for indoor use and wall mounting in upright position
A compatible H25 or C25 Reagent is required for operation
Free, short drain without back pressure required
Oxidizing agents (chlorine, ozone) above the drinking water limit values impair the measurement
Install maintenance set (item no. 33-090034) every 2 years or 30,000 analyzes
Clean the measuring cell every 6 months – use SYCON Clean (item no. 30-010900)

Measuring range and Reagents

The Sycon 2802 enables the monitoring of a measuring range (H25 for total hardness or C25 for carbonate hardness).
The measuring range depends on the Reagent used.

Measuring ranges for total hardness (H25):

Reagent	Item number		Measuring range
Reagent	Single bottle	Value pack	°dH	°f	ppm CaCo3	°e
H25-0,02	32-084115	32-484115	0,012 – 0,12	0,021 – 0,214	0,21 – 2,14	0,025 – 0,15
H25-0,05	32-084125	32-484125	0,02 – 0,2	0,036 – 0,357	0,36 – 3,57	0,025 – 0,25
H25-0,1	32-084135	32-484135	0,03 – 0,3	0,054 – 0,536	0,54 – 5,36	0,038 – 0,375
H25-0,2	32-084145	32-484145	0,06 – 0,6	0,11 – 1,07	1,1 – 10,7	0,08 – 0,75
H25-0,3	32-084155	32-484155	0,09 – 0,9	0,16 – 1,161	1,6 – 16,1	0,12 – 1,12
H25-0,5	32-084165	32-484165	0,15 – 1,5	0,27 – 2,68	2,7 – 26,8	0,19 – 1,87
H25-1	32-084175	32-484175	0,3 – 3	0,54 – 5,36	5,4 – 53,6	0,38 – 3,75
H25-2	32-084185	32-484185	0,6 – 6	1,1 – 10,7	10,7 – 107,1	0,76 – 7,51
H25-3	32-084195	32-484195	0,9 – 9	1,6 – 16,1	16,1 – 160,1	1,13 – 11,2
H25-5	32-084205	32-484205	1,5 – 15	2,7 – 26,8	26,8 – 267,9	1,88 – 18,8
H25-10	32-084215	32-484215	3 – 30	5,4 – 53,6	53,6 – 535,7	3,76 – 37,6

Measuring ranges for carbonate hardness (C25):

Reagent	Item number		Measuring range
Reagent	Single bottle	Value pack	°dH	°f	ppm CaCo3	mmol/l (KS4.3)
C25-1	32-086125	32-486125	0,3 – 7,5	0,5 – 13,4	5,3 – 134	0,11 – 2,68
C25-1,5	32-086135	32-486135	0,5 – 11,5	0,8 – 20,5	8,0 – 80,1	0,16 – 4,11
C25-2	32-086145	32-486145	0,6 – 15,0	1,1 – 26,8	10,6 – 268	0,21 – 5,36
C25-3	32-086155	32-486155	0,9 – 22,5	1,6 – 40,2	16 – 402	0,32 – 8,04

Specifications at a glance

Property	Value
Measuring principle	Colorimetric titration method
Parameters	Total hardness (H25 series) or carbonate hardness (C25 series)
Measuring range total hardness	0.012-30 °dH (11 Reagents)
Measuring range carbonate hardness	0.3-22.5 °dH (4 Reagents)
Accuracy	± 5 % of the measuring range end value
Repeat accuracy	± 2,5 %
units	°dH, °f, ppm CaCO₃, mmol/l, °e, °Zh
Analysis time	approx. 3 minutes
Indicator consumption	< 0.05 ml per analysis (depending on hardness)
Analysis per 500 ml bottle	min. 10,000 (with soft water)
Water consumption	approx. 1 l per analysis at 2 bar
Durability Reagent	min. 2 years (at < 25 °C, stored in the dark)

Electrical data

Property	Value
Supply voltage (230 V version)	100-240 V AC, 50/60 Hz
Supply voltage (24 V version)	21.6-26.4 V AC/DC, 50 Hz
Power consumption	max. 25 VA / 8 VA measurement mode / 3.5 VA standby
Fuses (230 V version)	2 A slow-blow + 400 mA slow-blow (5×20 mm)
Fuses (24 V version)	2 A slow-blow + 1 A slow-blow (5×20 mm)
Relay outputs	4 relays, max. 250 V AC/DC, 1 A, potential-free changeover contacts (NC/NO)
Relay 1	Limit value exceeded 1
Relay 2	Limit value exceeded 2 / limit value not reached / indicator level low
Relay 3	Device fault
Relay 4	Analysis active / cooling water valve / indicator level low
Analog output	0-20 mA or 4-20 mA, resolution < 100 µA, max. 750 Ω Load
RS485 interface	Modbus RTU – query of measured values and device parameters via PLC
Digital inputs	2× galvanically isolated – analysis start, water meter, flow monitor, interval reset, remote reset
Battery	CR2032 (date/time/status buffering)

Mechanical data

Feature	Wall bracket IP43	Housing IP54
Dimensions (W × H × D)	274 × 275 × 129 mm	332 × 345 × 190 mm
weight	approx. 2.0 kg	approx. 4.0 kg
Protection class	IP43	IP54

Ambient conditions

Ambient condition	Value
Operating temperature	10-45 °C
Storage temperature	0-45 °C
Sample water temperature	5-40 °C
Air humidity	20-90 % RH (non-condensing)
Inlet water pressure	min. 0.5 bar, max. 5 bar (recommended 1-2 bar)

Display and operation

Property	Value
Display	Multicolored graphic display
Operation	8 buttons
Languages	German, English, French, Italian, Spanish, Russian, Polish, Dutch, Danish
Data memory	SD card (measured value logging and software updates)

Scope of delivery

Component
1 × SYCON 2802 (configured for selected supply voltage)
Wall bracket or housing (depending on order variant)
SD card
Operating instructions

Note: A compatible H25 series (total hardness) or C25 series (carbonate hardness) Reagent is required for operation and must be ordered separately.

Additional information

Design	Housing IP54, Wall bracket IP43
Power supply	230 V AC, 24 V AC/DC
Manual	English, German
Parameter	p-value, Total hardness
Product category	Analyzer
Series	SYCON

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Flyer SYCON 2802 ENG

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Flyer SYCON 2802 DE

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