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Brand: JUMO
JUMO Ex-i Two-Channel Isolating Switch Amplifier 707540
Description
Two-channel isolating switch amplifier for NAMUR sensors and float switches
The JUMO Ex-i isolating switch amplifier (type 707540) provides safe galvanic isolation and transfer of switch signals from the hazardous area. It has two intrinsically safe inputs for unconnected contacts, contacts with a resistance circuit, or NAMUR proximity sensors per EN 60947-5-6, and one changeover relay per channel. The data sheet states it can be mounted in Ex zone 2 and used with a sensor in zone 0.
It is a natural match for JUMO NESOS float switches that have two switch contacts, and the two-channel design replaces a second amplifier, saving cost and cabinet space. Line fault detection watches both sensor lines for break and short circuit, and DIP switches set the phase reversal. The ambient range runs from -40 to +60 °C.
Phase reversal is available through DIP switch settings, and the relay contact rating of 500 VA lets it switch small contactors and signal lamps directly.
Technical specifications
| Parameter | Specification |
|---|---|
| Type | 707540; 2 channels; order code 707540/38 |
| Inputs | Intrinsically safe: NAMUR proximity sensors (EN 60947-5-6), unconnected switch contacts, or contacts with resistance circuit |
| Switching points | Blocking below 1.2 mA; conducting above 2.1 mA; hysteresis below 0.2 mA |
| Open-circuit data | Short-circuit current approx. 8 mA; no-load voltage approx. 8 V DC |
| Line fault detection | Break 0.05 to 0.35 mA; short circuit 100 to 360 Ohm sensor resistance |
| Outputs | 2 relays, 1 changeover (PDT) each; 250 V AC (2 A) / 120 V DC (0.2 A) / 30 V DC (2 A); 500 VA; minimum load 5 V / 10 mA |
| Relay life / speed | 10^7 mechanical cycles; switching frequency up to 20 Hz; step response approx. 4 to 10 ms |
| Supply | AC/DC 24 to 230 V, -20 to +10 %, 50 to 60 Hz; power consumption max. 1.1 W; dissipation max. 1.3 W |
| Safety data | Uo 9.56 V; Io 10.3 mA; Po 25 mW; Ci 11 nF; IIC simple circuit Lo 300 mH, Co 3.6 uF |
| Approvals as printed | ATEX IBExU 20 ATEX 1107 X; IECEx IBE 20.0029 X; UL Class I Div 2; IS for Class I, II, III Div 1; SIL per IEC 61508 listed as in development |
| Ex marking | II (1) G [Ex ia Ga] IIC; II (1) D [Ex ia Da] IIIC; I (M1) [Ex ia Ma] I; II 3(1) G Ex ec nC [ia Ga] IIC T4 Gc |
| Isolation | Input/output and input/supply 375 V peak (EN 60079-11); test voltage 2.5 kV AC; rated insulation 300 V rms |
| Ambient / humidity | -40 to +60 °C operation; -40 to +80 °C storage; 10 to 95 % non-condensing; max. 2000 m |
| Housing | PA 6.6-FR gray, UL 94 V0; 17.5 x 99 x 114.5 mm; IP20; DIN rail; terminals 0.2 to 2.5 mm2 |
Selection, accessories and use conditions
Order it as 707540/38 for the AC/DC 24 to 230 V supply. Delivery includes the device, operating manual and EU declaration of conformity. The data sheet lists JUMO NESOS float switches R01 LS (408301), R02 LS (408302), R03 LS (408303), R04 LS (408304) and the horizontal R40 LSH (408340) as accessories.
Special conditions are printed in the sheet. For installation in zone 2 the amplifier must sit in a housing meeting EN 60079-7 with at least IP54 or another recognized type of protection, non-intrinsically safe circuits must not be connected or disconnected in zone 2 while energized, and the DIP switches may only be used when no explosive atmosphere is present.
The data sheet defines the switching points of the NAMUR input: the signal is blocking below 1.2 mA and conducting above 2.1 mA, so a standard NAMUR sensor with a typical 8 V source is read reliably. For plain contacts a resistance circuit is used so that the line fault detection can tell a closed contact from a short circuit.
Applications
Typical jobs are high and low level alarms from float switches in fuel, chemical or water tanks, flow or position detection with NAMUR sensors, and relay coupling of hazardous-area contacts to a PLC input. Each channel has its own relay, so one device can serve a high alarm and a low alarm at the same time.
The line fault LEDs (LF1 and LF2) and output LEDs (OUT1 and OUT2) make loop checking quick. Wire the intrinsically safe inputs on terminals 4.1/4.3 (channel 1) and 5.1/5.3 (channel 2), and verify entity parameters of the field device and cable against the safety data before startup.
Because the relay is rated for up to 250 V AC and 500 VA, the output can drive a small interposing relay or a PLC input directly; the recommended minimum load of 5 V and 10 mA should be respected for dry-contact reliability. Plan terminal marking so that each channel keeps its own sensor, alarm and cable tag.
Before commissioning, compare the Ex entity values of the field device with the output values of the amplifier and the cable data. The safety data in the table must cover the connected circuit, and the wiring documentation should be kept with the plant records.
Documents and quotation
The manufacturer data sheet (JUMO Ex-i isolating switch amplifier 707540 data sheet V4.00 (EN)) is attached to this page as a PDF. Send the full type code you need through the quotation form and we will reply with availability and delivery terms; please confirm the options against your plant specification before ordering. Related items are listed under Isolator & Barrier.
Datasheets & Documents
- Datasheet JUMO Ex-i isolating switch amplifier 707540 data sheet V4.00 (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.
FAQ
Questions about the JUMO Ex-i Two-Channel Isolating Switch Amplifier
Answers from our engineering team on installation, compatibility and integration.
01How many channels does it have?
Two, each with its own changeover relay.
02Which sensors connect?
NAMUR proximity sensors per EN 60947-5-6, and switch contacts such as float switches.
03Does it detect wire faults?
Yes, line break and short circuit are detected and shown on red LEDs.
04What ambient range applies?
-40 to +60 °C in operation.
05Can it sit in zone 2?
Yes, in a housing meeting EN 60079-7 with at least IP54, per the special conditions.
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