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Brand: JUMO
JUMO AQUIS 500 Ci Inductive Conductivity Transmitter
Description
Maintenance-light conductivity and concentration control for dirty media
The JUMO AQUIS 500 Ci (type 202566) is a wall- or panel-mounted transmitter and controller that reads inductive conductivity cells and the temperature of the process liquid. Because an inductive cell has no metal electrodes in contact with the liquid, the measurement tolerates oil, grease, gypsum and lime deposits better than a conductive two-electrode cell, which makes the instrument a practical choice for CIP return lines, cleaning-chemical dosing and process water that fouls quickly. The unit converts the compensated conductivity either into a conductivity value in µS/cm or mS/cm or, with direct selection, into a concentration for NaOH, HNO3, H2SO4 or HCl, and it can also use a customer table of up to 29 value pairs entered through the optional setup program. A graphic LC display with plain-text parameters, a calibration logbook holding the last five calibrations and a binary input for HOLD or key inhibit keep daily operation simple.
Technical specifications
| Parameter | Specification |
|---|---|
| Basic type | 202566, JUMO AQUIS 500 Ci, transmitter/controller for inductive conductivity, concentration and temperature |
| Conductivity ranges | 0 to 9999 µS/cm; 0.000 to 9.999, 0.00 to 99.99 and 0.0 to 999.9 mS/cm; 0 to 2000 mS/cm |
| Accuracy | 1.5 % of range (0 to 1.000 mS/cm); 1 % of range (1.01 to 500 mS/cm); 1.5 % of range (501 to 2000 mS/cm) |
| Concentration ranges | NaOH 0 to 12 and 20 to 50 wt%; HNO3 0 to 25 and 36 to 82 wt%; H2SO4 0 to 28, 36 to 85 and 92 to 99 wt%; HCl 0 to 18 and 22 to 44 wt% |
| Temperature input | Pt100 or Pt1000 (automatic detection), -50 to 250 °C; NTC/PTC up to 4 kΩ; accuracy 0.5 K to 100 °C |
| Temperature compensation | Linear 0 to 5.5 %/°C (0 to 100 °C), natural water to ISO 7888 (0 to 36 °C), reference temperature 15 to 30 °C (25 °C preset) |
| Cell constant adjustment | 4 to 6 and 6 to 8 per cm; relative cell constant 80 to 120 %; installation factor 80 to 120 % |
| Analog outputs (max. 2) | 0/4 to 20 mA (load up to 500 Ω) or 0 to 10 V (load at least 500 Ω), 0.25 % accuracy, isolated, NAMUR NE43 |
| Switching outputs (max. 2) | SPDT relay, 3 A at 250 V AC resistive, more than 200,000 operations at rated load |
| Controller functions | Limit, pulse width, pulse frequency, modulating and continuous outputs; P, PI, PD, PID; sampling time 500 ms |
| Power supply | AC 110 to 240 V (+10/-15 %), AC/DC 20 to 30 V or DC 12 to 24 V; approx. 14 VA |
| Display | Graphic LC, 120 x 32 pixels, switchable backlight |
| Housing | ABS; IP67 surface-mounted, IP65 front and IP20 rear in panel; approx. 900 g or 480 g |
| Ambient temperature | -10 to +50 °C within accuracy; operating -15 to +65 °C; storage -30 to +70 °C |
| Approval | cULus, file E 201387, UL 61010-1 (all versions) |
Ordering the right AQUIS 500 Ci version
The order code is built in eight steps: basic type 202566, a basic-type extension (10 for panel mounting, 20 for the surface-mounted housing), output 1 and output 2 (000 for none or 888 for a 0(4) to 20 mA and 0 to 10 V analog output), outputs 3 and 4 (000 or 310 for a changeover relay) and the supply (23 for AC 110 to 240 V, 25 for AC/DC 20 to 30 V, 30 for DC 12 to 24 V), followed by extra codes. The datasheet example is 202566/20-888-000-310-000-23/000. The stock version listed by the manufacturer is 202566/20-888-888-310-310-23/000, part number 00542691, which has two analog outputs, two relays and the wide-range AC supply. Output 1 carries the main value or a continuous controller signal, while output 2 carries temperature or a second controller signal. Accessories include a protective roof, a pipe installation set, a DIN rail installation set, a support pillar, a holder for suspension fittings, a back-panel set, PC setup software with an interface cable, and a calibration adapter for inductive conductivity measurement. See the liquid analytical systems category for companion equipment.
Where the inductive principle pays off
JUMO names dairies, breweries, soft-drink bottling, mineral springs, drinking water, liquid food production, CIP and SIP systems, rinsing and cleaning processes and the concentration of acids, lyes and cleaning chemicals as typical uses. In hot, dusty regions the same logic applies to desalination pre-treatment, boiler and cooling-water monitoring, chemical-dosing skids and acid or caustic regeneration lines, where sensor fouling would otherwise force frequent cleaning. The transmitter is designed to connect JUMO tecLine Ci inductive cells (datasheet 202941) through an M12 connector; the row 2 terminals are factory wired for that purpose and must not be rewired. A ventilation screw with a PTFE membrane limits condensation inside the enclosure, and the housing accepts up to two M16 and two M12 cable glands. The surface-mounted case can be fitted to a pipe or DIN rail with the optional sets, so the unit can sit close to the sampling point instead of in a distant cabinet.
For a pH-based loop see the published AQUIS 500 pH transmitter, and for conductive two-electrode cells the AQUIS 500 CR.
Documents and quotation
The manufacturer document for this model is the JUMO data sheet 202566 (12 pages, V2.01, English), hosted here for reference. Confirm the cell type, output options, supply voltage and housing version against the operating manual before ordering. Seven Star LLC supplies JUMO instruments as an independent supplier in Muscat; send us the order code, process medium and temperature range and we will respond with a quotation.
Datasheets & Documents
- Datasheet JUMO AQUIS 500 Ci data sheet 202566 (EN) Download
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About brand
JUMO is the German maker of temperature sensors, process controllers, pressure transmitters and liquid analysis instruments. Moritz Kurt Juchheim founded it in Fulda in 1948 as M. K. Juchheim KG, making glass thermometers with six employees. The name JUMO comes from the founder's name. It is still a family company headquartered in Fulda, and the parent company has been called JUMO GmbH & Co. KG since 2003.
Seven Star LLC is an independent supplier in Muscat. We list JUMO RTD and thermocouple probes, thermowells, transmitters, controllers, recorders and water analysis instruments, and supply them to process plants, OEMs, HVAC contractors and water utilities in Oman and the GCC by type number.
JUMO company profile
| Established | 1948, Fulda, Germany, by Moritz Kurt Juchheim |
|---|---|
| First products | Glass and contact thermometers; platinum glass sensors from 1966 |
| Ownership | Family-owned; renamed JUMO GmbH & Co. KG in 2003 |
| Product families | RTD and thermocouple probes, thermowells, temperature and pressure transmitters, controllers and thermostats, safety temperature limiters, paperless recorders, liquid analysis and flow and level instruments |
Milestones
- 1948: Moritz Kurt Juchheim founds M. K. Juchheim KG in Fulda, making glass thermometers with six employees.
- 1966: Platinum glass temperature sensors are added.
- 2003: The parent company is renamed JUMO GmbH & Co. KG.
JUMO products we list
| Family | Models | Typical use |
|---|---|---|
| RTD and thermocouple probes | 902020, 902030, 902050, 902120, 902006 2xPt100, PROCESStemp, mineral-insulated RTD, 901020 thermocouple, 901210, 902810 hygienic, 902550 surface, 902520 HVAC, MarineTemp | Temperature measurement in pipes, vessels, machines, HVAC and food plants |
| Thermowells and inserts | 909710 thermowells, 909740 measuring inserts | Protecting sensors and replacing them without opening the process |
| Temperature transmitters | dTRANS T01, T03, T04, T05, T06 SIL, T07 HART, T09, T1000 IO-Link, DELOS T switch | Converting sensor signals to 4-20 mA, HART or IO-Link |
| Pressure and level | dTRANS p20, p30, p31 hygienic, p33 Ex, p02 DELTA, MIDAS S05, MIDAS DP10, DELOS S02, MAERA S25, NESOS R20 | Pressure in process, hydraulic and OEM systems; tank and well level |
| Controllers, limiters and recorders | DICON touch, IMAGO 500, dTRON 316, iTRON, cTRON, diraTRON 104, eTRON T, safetyM STB/STW, safetyM TB/TW, LOGOSCREEN 601, mTRON T | Furnace, oven and process control, over-temperature protection and recording |
| Liquid analysis and flow | AQUIS touch S, AQUIS touch P, AQUIS 500 pH, AQUIS 500 CR, dTRANS pH 02, pH electrode, digiLine DO, ecoLine NTU, flowTRANS MAG H20, flowTRANS US W01 | pH, conductivity, oxygen and turbidity in water treatment; liquid flow |
Choosing a temperature sensor starts with the range and accuracy. A Pt100 RTD is accurate and stable from about -200 to 600 °C and is the usual choice in process plants. A thermocouple (type K or J, for example) covers much higher temperatures and responds faster but is less accurate. The wiring also matters: a 3-wire or 4-wire Pt100 connection cancels the resistance of the cable, while a 2-wire connection adds an error that grows with cable length. That is why a head-mounted transmitter is often fitted close to the sensor.
Where JUMO products are used
In Oman and the GCC, JUMO sensors and controllers are used in oil and gas and chemical plants, food and beverage production, plastics and metal heat treatment, HVAC and district cooling, water and wastewater treatment, swimming pools and marine applications.
Ordering JUMO products: what we need
Send the JUMO type number and the full order code from the label (for example 902020/10-...). For probes, add the sensor type (Pt100, Pt1000, type K or J), the number of wires, the insertion length and diameter, and the process connection. For controllers, add the input, outputs and supply voltage.
Facts checked against JUMO's company history, October 2026.
Browse JUMO products by category: Temperature Instrumentation, Pressure Instrumentation, Liquid Analysis Sensors, Controllers & Data Acquisition, Level Transmitter.
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Frequently Asked Questions
What does the AQUIS 500 Ci measure?
It measures inductive electrolytic conductivity and temperature, and converts conductivity to a concentration for NaOH, HNO3, H2SO4 or HCl or through a customer table.
Which sensors can be connected?
JUMO tecLine Ci inductive conductivity cells with an M12 connection, described in datasheet 202941, plus a Pt100, Pt1000 or NTC/PTC temperature input.
What are the housing protection ratings?
IP67 for the surface-mounted housing; for panel mounting IP65 at the front and IP20 at the rear.
What does extension code 10 or 20 mean?
Code 10 is for panel mounting and code 20 is the surface-mounted housing, selected in step 2 of the order code.
Which approval is printed on the datasheet?
The datasheet lists cULus, file E 201387, test basis UL 61010-1, valid for all versions.
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