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Brand: VEGA
VEGA VEGATOR 121 Controller for 8/16 mA Vibrating Switches
Description
The relay interface for two-wire VEGA vibrating level switches
The VEGATOR 121 is the processing unit for VEGA’s vibrating level switches VEGASWING, VEGAVIB and VEGAWAVE in the “two-wire 8/16 mA” electronics version. The switch reports covered or uncovered as a current step, and the VEGATOR powers the loop, evaluates the step and switches a relay for overflow or dry-run protection. VEGA states the signal can come from a hazardous area, the circuit is monitored for line break and short-circuit, and an active fault signal via a relay is optional. A test key allows simple function tests, also for SIL-relevant applications.
Technical specifications
| Parameter | Specification |
|---|---|
| Type | VEGATOR 121, single-channel controller for 8/16 mA point level sensors |
| Series | Module unit for carrier-rail mounting, 35 x 7.5 mm rail acc. to EN 50022/60715, detachable coded terminals |
| Operating voltage | 24…230 V AC (-15 %, +10 %), 50/60 Hz; 24…65 V DC |
| Max. power consumption | 3 W (8 VA) |
| Input | 1 x analogue 8/16 mA, active (sensor power supplied by VEGATOR 121) |
| Switching threshold | Off at 11.9 mA |
| Terminal voltage, idle | 18.2 V DC ± 5 % |
| Internal resistance | 200 Ω ± 1 % |
| Current limitation | 23 mA, permanently short-circuit proof |
| Fault detection | Line break ≤ 3.6 mA; short-circuit ≥ 21 mA |
| Relay output | 1 operating relay + 1 operating/fail-safe relay; floating SPDT |
| Contact rating | Max. 253 V AC / 50 V DC; 3 A AC / 1 A DC; 500 VA, 54 W DC |
| Switch-on/off delay | 150 ms basic (± 20 %); adjustable 2 / 6 / 8 s (± 20 %) |
| Ambient temperature, protection | -20…+60 °C; IP20; pollution degree 2 |
What an 8/16 mA switch needs
Two-wire 8/16 mA is VEGA’s standard for plics-based vibrating switches without a relay, because one pair of wires delivers the supply and the status: about 16 mA indicates one state and about 8 mA the other, with line break below 3.6 mA and short-circuit above 21 mA reported as faults. The VEGATOR 121 has a threshold at 11.9 mA, so it sits midway between the two levels, and the internal resistance and terminal voltage listed in the sheet size the loop supply.
Using the test key
The test key, which VEGA describes as a simple and convenient function test also for SIL applications, lets the operator simulate the alarm state without wetting the probe. The module can serve overfill alarms in tank farms and dry-run protection in pump skids, with the sensor field-mounted in a hazardous area. Provide the sensor model, whether you need the optional second relay, and your supply voltage in the RFQ, and confirm the Ex marking with the manufacturer.
Because the controller sits in the cabinet and not in the field, a wiring fault or a failed switch is signalled at the rail module and not discovered only when a tank overflows. For an RFQ, name the exact VEGASWING, VEGAVIB or VEGAWAVE switch it will serve, the supply voltage and the relay load, and have the manufacturer confirm compatibility with the sensor you intend to fit.
Related VEGA products: VEGA VEGAMET 841 Field Level Controller, VEGA VEGATOR 141 Level Controller for 4-20 mA Sensors and VEGA VEGATRENN 141 Ex Separator for 4-20 mA HART Sensors.
Documents and quotation
The official VEGA VEGATOR 121 specification sheet (46111-EN, version 250605) is attached to this page for download and covers the technical data, dimensions and wiring summarised above.
For a quotation, tell us the medium, tank or channel dimensions, output signal, hazardous-area requirement and quantity. Seven Star LLC, an independent supplier in Muscat, will respond with availability and a commercial offer; other level instrumentation is on our site. Always verify the complete order code against VEGA’s configurator before you place an order.
Datasheets & Documents
- Datasheet VEGA VEGATOR 121 Specification Sheet (46111-EN) Download
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About brand
VEGA is a German maker of level and pressure instruments. Bruno Grieshaber founded the company in 1959 in Triberg in the Black Forest, and it has been based in Schiltach since 1975, still family owned as VEGA Grieshaber KG. VEGA is best known for radar level sensors: it introduced the first two-wire radar level sensor in 1997 and the first 80 GHz radar sensor for bulk solids, the VEGAPULS 69, in 2015.
Seven Star LLC is an independent supplier listing VEGA radar and guided wave radar transmitters, point level switches, pressure transmitters and signal conditioning instruments for buyers in Oman and the GCC. Sensors are matched from the product code on the type label.
VEGA at a glance
| Origin | Founded by Bruno Grieshaber in 1959 in Triberg, Germany |
|---|---|
| Headquarters | Schiltach, Black Forest, Germany (since 1975) |
| Ownership | Family-owned company: VEGA Grieshaber KG |
| Milestones | First two-wire radar level sensor (1997), first 80 GHz radar for bulk solids, VEGAPULS 69 (2015), VEGAPULS 6X single radar platform for liquids and solids |
| Product families | VEGAPULS radar, VEGAFLEX guided wave radar, VEGASWING and VEGAPOINT switches, VEGACAL capacitive probes, VEGABAR and VEGADIF pressure, VEGAMET and VEGADIS signal conditioning |
VEGA sensor and instrument series
| Series | Type | Typical use |
|---|---|---|
| VEGAPULS 6X, VEGAPULS 69, VEGAPULS 64 | Process radar level transmitters (80 GHz) | Storage and process tanks, reactors with agitators, silos and bulk solids |
| VEGAPULS 11, 21, 31, 42 | Compact radar sensors | Water and wastewater, simple storage tanks; VEGAPULS 42 with IO-Link for machine integration |
| VEGAPULS C 21, C 11, C 22, C 23 | Radar sensors with fixed cable, IP68 | Wet wells, pumping stations, open channels and river levels |
| VEGAFLEX 81, 82, 83, 86 | Guided wave radar (TDR) | Level and interface in liquids, bulk solids, hygienic and high-temperature or high-pressure service (VEGAFLEX 86) |
| VEGASWING 61, 63, VEGAPOINT 21 | Vibrating and capacitive point level switches | Overfill protection, dry-run protection and high or low level alarms |
| VEGACAL 62 to VEGACAL 67 | Capacitive rod and cable probes | Point and continuous level in solids and conductive or adhesive liquids |
| VEGABAR 82, 83, 28, 29, 38 | Pressure transmitters, ceramic or metallic cell | Process pressure and hydrostatic level; compact 18/19 and 28/29/38 versions for utilities |
| VEGADIF 85 | Differential pressure transmitter | DP flow, filter monitoring and level in pressurised vessels |
| VEGAMET 841, VEGADIS 176 | Controller and loop display | Level display, pump control and remote indication of 4-20 mA signals |
Where VEGA instruments are used
VEGA radar sensors measure level in crude oil and product tanks, separators, chemical reactors, cement and aggregate silos, grain stores and water reservoirs. Compact cable radars are widely used in wastewater pumping stations and flood monitoring. Because 80 GHz radar focuses a narrow beam, it can measure past internal structures in a tank, and it is not affected by the temperature, pressure or vapour above the product, which suits hot Gulf storage tanks.
Ordering VEGA instruments: what we need
The product code on the type label (for example PS64.XXXXXXX) fixes the measuring range, antenna or probe, process connection, electronics and approvals. Send it with the serial number. For a new measurement add the medium and its dielectric constant if known, tank or silo height and internals, process pressure and temperature, process connection, output (4-20 mA HART, PROFIBUS PA, Modbus or IO-Link), and any hazardous-area or overfill protection approval required.
Facts checked against VEGA company and product information, October 2026.
Browse VEGA products by category: Level Transmitter, Pressure Instrumentation, Controllers and Data Acquisition.
FAQ
Questions about the VEGA VEGATOR 121 Controller for 8/16 mA Vibrating
Answers from our engineering team on installation, compatibility and integration.
01Which sensors does the VEGATOR 121 connect to?
VEGASWING, VEGAVIB and VEGAWAVE switches with the two-wire 8/16 mA electronics.
02What is the switching threshold?
11.9 mA.
03Is there a function test?
Yes, a test key allows a simple function test, also for SIL applications.
04Can the signal come from a hazardous area?
VEGA states the signal can originate from a hazardous area; check the approval for your sensor.
05What supply does it need?
24…230 V AC or 24…65 V DC.
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