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A servo vs radar tank gauging decision should begin with a list of functions used by the terminal, not a comparison of two level readings. A servo installation may supply product level and, with the appropriate equipment and operating sequence, interface or density information. Replacing it with a radar that provides only level can remove data the inventory system still expects.
Compare what moves and what is measured
A servo gauge controls the position of a suspended displacer using its apparent weight in the product. Wire, drum, drive and displacer condition affect its operation. A free-space radar derives distance from microwave reflections and has no measuring wire descending through the liquid.
That difference changes maintenance, but it does not make radar maintenance-free. Deposits can affect the antenna, structures can interfere with the beam and a changed reference can alter the reported level. The two technologies need different inspection and verification arrangements.
| Existing function | Question for a proposed radar replacement |
|---|---|
| Product level | Can the antenna follow the intended surface throughout the operating interval? |
| Interface or density | Which separate measurement or supported function will provide this information? |
| Tank-system data | Can the host receive the required variables, units and quality states through the proposed interface? |
| Approved gauging duty | Does the proposed complete system have the evidence required for that use? |
Turn the servo vs radar tank gauging comparison into a function list
Export or document the variables actually used by the existing tank application. Distinguish a value measured by the gauge from one entered manually or calculated by the host. Record which values are essential to invoicing, inventory, alarms or operating decisions; a field labelled density does not reveal how the number was obtained.
For each required value, identify the replacement source and its update and quality behaviour. Do not substitute a fixed default for a measurement without an explicit engineering decision. The interface test should check missing and invalid information, not just successful transmission of one level.
The METRAVON MV-RD12 is a candidate for a defined liquid process-level duty. Its published specification does not establish servo-bus emulation, a tank density profile, water-bottom detection or custody-transfer certification. If the existing application requires those functions, they must be addressed before treating it as a replacement proposal.
Inspect the mechanical route independently of the electronics
A clear displacer path is not automatically a suitable radar path. Review the mounting reference, nozzle and any still pipe against the selected antenna. Existing joints, slots, internal deposits or obstructions may affect radar differently from the old mechanical gauge.
Document process conditions across the operating cycle, including product changes, temperature, pressure and deposits. Neither an old servo accuracy statement nor a new radar nominal figure represents the uncertainty of the complete inventory calculation. Tank geometry and any temperature or density corrections remain part of that calculation.
Plan a comparison period with a defined reference
Where the approved installation permits parallel observation, compare the instruments at the same time and process state. A disagreement does not identify which instrument is wrong. Use the agreed reference and investigate datum, interface and conversion differences before applying an offset.
Include mechanical alterations, host configuration, verification, maintenance access and spare strategy in the cost review. Retaining a serviceable servo can be reasonable when its extra functions remain essential. A radar conversion can be appropriate when its documented capability meets the actual duty and the integration work is understood.
Q1. Does no moving measuring element mean no service work?
No. Radar avoids the wire-and-displacer mechanism, but installation, antenna condition, electronics and signal handling still need attention appropriate to the service.
Q2. Can the old two-wire connection prove compatibility?
No. Conductor count does not identify supply, signalling or the host protocol. Compare the actual electrical and data requirements.
Q3. What is the first document to request for a retrofit?
Prepare a function-and-interface list for the existing gauging system, then ask the proposed supplier to mark each requirement as supported, separately supplied or outside scope.
Summary
Preserve the required information before choosing a different measurement principle. Submit the tank duty and existing variable list to establish where a METRAVON process radar fits and what it does not replace.
