How to Read Your RECD Test Certificate: A Field-by-Field Guide

If someone just handed you an RECD test certificate and asked “is this okay?”, you are not alone in staring at a page full of acronyms, kVA figures, and percentages with no idea which number actually matters. Facility managers, plant heads, and procurement teams see these documents for the first time exactly when they need them most, usually during a pollution control board inspection or right after a vendor hands over a completed installation. There is rarely time to learn certificate literacy on the spot.

This guide walks through an RECD test certificate the way you’d actually read one: top to bottom, section by section, in the order the information appears on the page. By the end, you should be able to open a real certificate for your own DG set and know exactly what each block is telling you, which numbers are load-bearing for compliance, and which are just administrative detail.

One thing this guide will not do is tell you how to cross-check a certificate against your physical equipment to catch fraud or mismatched documents. That is a separate, more forensic process, and we’ve already written a full walkthrough of it in how to verify a CPCB-tested RECD DG set. Read that one once you understand what you’re looking at here. This post is about comprehension. That one is about verification.

Why This Document Exists in the First Place

Every RECD sold in India is required to pass performance testing before it can be marketed as CPCB compliant. The testing follows a procedure CPCB published for exactly this purpose, referenced on paperwork as PCLS/12/2021-22, and it’s carried out at government-recognised emission testing laboratories rather than by the manufacturer itself. Two names come up repeatedly in this space: ARAI (the Automotive Research Association of India) and ICAT (the International Centre for Automotive Technology). Both are accredited to run the emission tests that generate the numbers on your certificate.

The result of that testing is a document (or, more often, a small set of documents) that proves a specific RECD model, built by a specific manufacturer, achieved a specific level of pollutant reduction under controlled conditions. That proof is what a pollution control board inspector, an auditor, or your own compliance file is ultimately relying on. If you want the fuller regulatory backstory, our why RECD is mandatory in India post covers the legal chain that makes this paperwork necessary at all, and our timeline of CPCB emission norms for generators post traces how the testing requirement itself evolved.

The three documents people confuse

Before we get into reading the certificate, it helps to know there isn’t just one piece of paper in play. You’ll typically encounter up to three related documents, and they get confused constantly:

The Test Report is the raw laboratory output: the specific readings recorded during the actual test run on a specific unit, on a specific date, at a specific facility.

The Type Approval Certificate is CPCB’s formal sign-off that a particular RECD model (not just the one unit tested, but the model as a design) meets the required standard, valid for units built to that same specification within a defined kVA band.

The Installation or Compliance Certificate is something your vendor issues after fitting the RECD to your specific generator, confirming the installed unit matches the approved type and is functioning correctly on your machine.

A test report proves a lab result happened. A type approval certificate proves CPCB accepted that result as sufficient for a model line. An installation certificate proves your particular generator now carries an approved unit. All three matter, but they answer different questions, and a vendor who hands you only one of the three hasn’t given you the full picture.

The Four Zones of an RECD Test Certificate

Regardless of which of the three documents above you’re holding, the information on it tends to cluster into four recognisable zones. Learning to scan for these zones, rather than reading every line in order, is the fastest way to get comfortable with the document.

Zone 1: The Identification Block

This is almost always at the top of the page, and it answers one question: whose equipment is this certificate actually about?

Look for these fields:

Manufacturer name. The company that designed and built the RECD unit. This should be a real, traceable business name, not a generic label.

RECD model or product code. Manufacturers assign internal model numbers to their product lines (something like a series name followed by a capacity designation). This code is what ties the certificate to a specific design, and it’s the field you’ll compare most often against the identification plate riveted to your actual unit.

Capacity or kVA band covered. Type approval is generally granted in bands rather than for one exact kVA figure, commonly grouped in ranges such as 62.5-125 kVA, 140-320 kVA, 320-500 kVA, and 625-910 kVA. Your generator’s rated capacity needs to fall inside the band printed here, not just be “close to” it.

Certificate or report number. A unique reference number the issuing lab or CPCB assigns to this specific document. This is the number you’d quote if you ever needed to query the issuing authority about the certificate’s status.

Date of issue. Straightforward, but easy to skip past. Note it, because it feeds directly into the validity question in Zone 4.

If any of these fields are blank, generic, or handwritten in a document that’s otherwise printed, that’s worth pausing on. Genuine certificates are formal documents with consistent formatting throughout.

Zone 2: The Test Parameters Block

This section describes how the test was actually conducted, not what it found. Think of it as the “methodology” section of the document.

Testing laboratory name. This should name an actual accredited facility, most commonly ARAI or ICAT, along with a location. A certificate that doesn’t name the lab that ran the test is missing a fairly basic piece of information.

Test standard or procedure reference. You’re looking for a reference to CPCB’s RECD testing procedure, typically cited as PCLS/12/2021-22. This tells you the test followed the government-mandated methodology rather than an internal or informal one.

Engine and fuel details used during the test. Emission performance is sensitive to engine condition and fuel quality, so a properly documented test will record what engine the RECD was mounted on during testing and what fuel was used.

Test date and duration. When the physical test run happened, and how long it ran for. Emission testing typically involves the engine running through defined load cycles rather than a quick spot check, so you may see references to load points or duty cycles here.

Ambient and operating conditions. Some certificates note temperature, altitude, or load conditions during the test, since these can influence results at the margins.

None of these fields are the “headline number” people usually go looking for, but they’re what make the headline number credible. A result without a documented method behind it is just a claim.

Zone 3: The Results Block

This is the section everyone actually wants to read first, and it’s where the percentages live. Read it carefully, because this is also the section most often summarised loosely or misquoted in marketing material.

Pollutants measured. RECDs are tested against several pollutants, most commonly particulate matter (PM), and depending on the technology and test scope, also nitrogen oxides (NOx), carbon monoxide (CO), and hydrocarbons (HC). Not every certificate reports all four with equal prominence, so check which specific pollutants this particular document actually covers.

Before and after readings. Proper test reports show emission levels measured both without the RECD fitted (baseline) and with it fitted, usually expressed in grams per kilowatt-hour (g/kWh). The percentage reduction you see quoted is calculated from these two numbers, so if a certificate only shows a final percentage with no baseline figure behind it, that’s a document with less rigour than it should have.

Reduction percentage. This is the number most people scan for first, and CPCB’s mandated minimum for type approval is a particulate matter reduction of at least 70 percent. Many approved units on the market today report considerably higher figures, with well-tested systems in the 90 to 96 percent range for PM specifically. Our RECD vs DPF comparison post goes deeper into how these percentage figures compare across different emission control technologies, if you want that context.

Pass or fail determination. Somewhere in this block, or immediately following it, the document should state plainly whether the tested unit met the required threshold. This is the section’s actual verdict, and everything else in the results block exists to support it.

A results block with strong percentages but no baseline data, no stated pollutant list, and no explicit pass or fail line is a red flag worth noting, and we’ll come back to that in the red flags section below.

Zone 4: The Validity and Authentication Block

This is usually the last section on the page, and it’s the one people skip fastest, which is a mistake, because it determines whether the certificate is actually usable today.

CPCB approval or reference number. Distinct from the lab’s own test report number, this is CPCB’s own reference tying the type approval back to its records. If a certificate only carries a lab-issued number with no corresponding CPCB reference, it may represent test data that hasn’t actually completed the approval step yet.

Scope of approval. A precise statement of exactly what the approval covers: which model, which kVA band, and sometimes which specific manufacturing batch or date range. Approval for one model in one capacity band does not automatically extend to a different model or a different band from the same manufacturer, even if the two units look similar.

Validity period, if stated. Not every type approval carries an explicit expiry date the way a renewable license does, but some documents do specify a validity window or a re-verification requirement. Check for this rather than assuming permanence.

Signature, seal, or authentication mark. A genuine certificate carries a signature from an authorised official, an official seal or stamp, or in more recent documents, a QR code or digital verification element. A document missing all forms of authentication is not something you should treat as final proof of anything.

A Worked Example: Reading a Certificate Top to Bottom

To make this concrete, here’s how a reasonably competent reading of a certificate should flow, using an illustrative (not a real, quoted) example structure.

You open the document and first scan Zone 1. It names a manufacturer, lists a model code, and states the approval covers the 125-320 kVA band. Your generator is rated at 200 kVA, so it falls inside that band. Good, so far this document is at least talking about the right category of equipment.

You move to Zone 2. The lab is named, the procedure reference matches CPCB’s PCLS/12/2021-22 standard, and the test date is recent enough that it isn’t obviously stale. The engine and fuel used during testing are documented. This tells you the number you’re about to read in Zone 3 came from a properly conducted test, not an estimate.

In Zone 3, you find PM reduction reported at 92 percent, with baseline and post-fit readings both shown in g/kWh, and an explicit “meets CPCB requirement” statement. NOx and CO figures are also present, each with their own before-and-after readings. This is a thorough results section, not a cherry-picked headline number.

Finally, Zone 4 shows a CPCB reference number distinct from the lab’s own report number, a clearly stated scope (this model, this kVA band, this manufacturer), and an authorised signature with an official seal.

At the end of that read, you have a document that identifies the right equipment, describes a credible test method, reports a specific and well-supported result, and carries proper authentication. That’s what a complete, trustworthy certificate looks like in practice. If your own certificate is missing entire zones, or has fields that don’t line up the way this example does, treat that as a prompt to ask your vendor for the missing piece, not as something to quietly overlook.

A Short Glossary for the Acronyms You’ll See

PM (Particulate Matter): The soot and fine particles in diesel exhaust, the primary pollutant RECDs are built to capture.

NOx (Nitrogen Oxides): A group of gases formed during high-temperature combustion, linked to smog and respiratory harm.

CO (Carbon Monoxide): A toxic gas produced by incomplete combustion.

HC (Hydrocarbons): Unburned fuel components released in exhaust gas.

g/kWh (grams per kilowatt-hour): The standard unit for expressing how much of a pollutant is emitted relative to the power the engine produces, used throughout emission test reporting.

Type Approval: CPCB’s formal acceptance that a product design, not just one physical unit, meets the required emission standard.

ARAI and ICAT: The two most commonly cited accredited testing agencies for automotive and generator emission testing in India.

CPCB IV+: The current generator emission norm; useful background if you’re also trying to understand how RECD-fitted older gensets compare to new CPCB IV+ machines, which our CPCB II vs CPCB III vs CPCB IV+ norms explained post covers in depth.

Red Flags to Watch For While Reading

A handful of patterns show up repeatedly on problematic documents, and once you know to look for them, they’re easy to spot.

A percentage with no baseline numbers behind it. If the only figure on the page is “up to 96 percent reduction” with nothing showing what was measured before and after, you’re looking at a marketing claim dressed up as a test result, not the test result itself.

A kVA band that doesn’t match your generator. Type approval is band-specific. A certificate approved for a 62.5-125 kVA band does not cover a 400 kVA installation, no matter how similar the RECD hardware looks.

No named testing laboratory. Legitimate certificates name ARAI, ICAT, or another accredited facility. A document that references testing without naming who did it is incomplete at best.

Inconsistent formatting or fonts. Certificates are formal documents, and altered or reissued paperwork sometimes shows tell-tale signs like mismatched fonts, uneven alignment, or visible overwriting.

Only one reference number where two should exist. Remember Zone 4: a genuine type approval typically carries both a lab-issued test report number and a separate CPCB reference. One without the other is worth a direct question to your vendor.

If you spot any of these issues, the right next step is the full verification process in our CPCB-tested RECD verification guide, which walks through exactly how to escalate a mismatch or a suspicious document with your vendor or, if needed, with the pollution control board directly.

How Certificate Reading Differs Across Document Types

It’s worth being explicit about how the four-zone approach above applies slightly differently depending on which of the three documents from earlier you’re actually holding.

On a test report, expect Zone 2 (test parameters) and Zone 3 (results) to be the most detailed sections, since this document exists specifically to record what happened during one lab session. Zone 1 identification detail may be comparatively brief, and Zone 4 authentication is often simpler, sometimes just a lab signature rather than a full CPCB reference.

On a type approval certificate, Zone 4 becomes the most important section, since this document’s entire purpose is establishing an official, CPCB-linked scope of approval covering a model and capacity band, not just reporting one test run. Zone 3 results may summarise the underlying test report’s findings rather than repeating every raw reading.

On an installation or compliance certificate from your own vendor, Zone 1 identification detail expands to include your specific generator (serial number, site location, installation date), since this document’s job is tying an approved model to your particular machine. This is also the document most likely to reference the earlier type approval certificate by its reference number, rather than restating the full test data itself.

Knowing which document you’re looking at before you start reading saves confusion, since a perfectly valid test report will look “incomplete” if you’re expecting to find Zone 4 CPCB authentication detail that genuinely lives on a separate document instead.

Frequently Asked Questions

Do I need to keep the original test certificate on-site, or is a copy enough? Pollution control board inspectors generally accept certified copies as long as they’re legible and complete, but many facilities keep the original in a compliance file and a laminated or scanned copy on-site for day-to-day reference. Check your local SPCB or DPCC’s specific documentation expectations, since practice can vary slightly by state.

My certificate lists a kVA band, not my exact generator capacity. Is that normal? Yes. Type approval is granted for bands rather than individual kVA figures, since RECD testing is done per model line and capacity range rather than per unit sold. As long as your generator’s rated capacity falls within the stated band, this is expected and correct.

What’s the difference between the percentage on my certificate and the “96 percent” figure I keep seeing in RECD marketing material? Marketing material often quotes a manufacturer’s best-case or flagship figure, which may reflect a different model, a different capacity band, or ideal test conditions. Always treat the number printed on your own unit’s certificate, tied to your specific model and capacity, as the figure that applies to you. Our RECD benefits overview explains how these headline percentages are generally framed at the product level.

Can a certificate expire? Type approval itself is generally tied to the model and manufacturing specification rather than carrying a simple expiry date the way a renewable license does, but some documents do specify re-verification requirements or validity windows. Check Zone 4 of your specific certificate rather than assuming either way.

Who do I contact if I think my certificate has an error or a mismatch? Start with the vendor or manufacturer who supplied the RECD and the paperwork. If the issue isn’t resolved, you can escalate to the testing laboratory named on the certificate, or to your state pollution control board. Our certifications page has more detail on how Aceget’s own documentation is structured, and our team is available through the contact page if you’d like a second set of eyes on a document you’re unsure about.

The Short Version

A trustworthy RECD test certificate identifies the exact equipment it covers, documents how the test was conducted and by whom, reports specific before-and-after numbers rather than just a final percentage, and carries proper CPCB authentication and a clearly stated scope of approval. Learn to scan for those four zones in order, and a document that looked like an intimidating wall of numbers on first glance becomes a fairly quick, five-minute read. And if anything you find while reading doesn’t add up, that’s exactly what the fuller verification process is there to help you resolve, backed where needed by CPCB’s own genset emission notifications and the testing standards maintained by ARAI and ICAT.