Tempsens Instruments IPO: what the DRHP says about India's largest temperature-sensor maker
Quick Summary: Tempsens Instruments (India) — India's largest contact and non-contact temperature sensor manufacturer, ~10% market share — is raising up to ₹118 Cr fresh (reported ~₹95 Cr) plus a 1.79 Cr-share OFS at a ₹285–300 band. Revenue grew 26.4% CAGR FY23–25 to ₹378.53 Cr with EBITDA margin at 25.45%. The offer opens Aug 20, 2026. The story to check is not growth — it is working capital, which stretched to 193 days in FY25.
Anyone who has priced an industrial IPO in the last two years has seen this shape: a niche manufacturer, a leadership claim, three years of rising margins, and a price band that arrives before the market has a number to argue with. Tempsens is that company. The DRHP filed September 29, 2025 tells a clean story — and then, on the working capital page, tells a second one. This is not a view on the offer. It is what the prospectus says about the company behind it.
The first story is genuinely good. The second is the one worth reading twice.
The company in one paragraph
Tempsens Instruments (India) Limited is a thermal engineering and specialised cable manufacturer from Udaipur, Rajasthan, with three verticals — temperature sensing solutions, electrical heating solutions, and specialised cables. Per the DRHP's F&S report, it is the largest manufacturer of contact and non-contact temperature sensors in India by revenue, with ~10% share of the temperature sensor segment in FY25, and the only Indian manufacturer of non-contact sensors, holding ~18% of that segment. It operates 11 manufacturing units — 8 in Udaipur and 3 overseas (UAE, South Korea, Indonesia) — and exports ~26.7% of FY25 revenue. Its Indonesian JV is described as one of Indonesia's market leaders in temperature sensors.
What it makes: three verticals, one engineering core
| Vertical | Key products |
|---|---|
| Temperature sensing | Thermocouples, RTDs, thermowells, protection tubes, infrared pyrometers, online thermal imagers, temperature & pressure gauges, temperature transmitters, fibre-optic temperature sensors, heat flux sensors, calibrators, data loggers |
| Electrical heating | Immersion, process, skid, cartridge, band, tubular, flexible and furnace heaters; laboratory and process furnaces |
| Specialised cables | Instrumentation cables, heat trace cables, thermocouple/RTD cables, mineral-insulated (MI) cables, nickel alloy conductors |
The engineering envelope is wide: thermocouples measure −200°C to 2,320°C, RTDs −200°C to 850°C, and MI cables retain fire-proof integrity up to 1,200°C. Backward integration runs from melting and drawing through welding, assembly, calibration and testing, with a NABL-accredited calibration centre in Udaipur (contact −196°C to 1,600°C; non-contact up to 3,000°C). The DRHP also cites pipeline products — slot RTDs, mid-voltage heaters, pressuriser heaters for nuclear reactors — and a subsidiary partnership (Pyrosens, agreements dated Feb 21, 2025) with Germany's Micro-Epsilon to localise pyrometers and online thermal imagers. A proposed Tempsens Instruments GmbH in Germany is referenced as an international expansion step.
The market: an import-substitution story with a 9.4% CAGR
India's temperature sensors and allied products market was ~₹17.5 bn (₹1,750 Cr) in FY25 and is projected at ₹27.4 bn by FY30E — a 9.4% CAGR. Globally, the market was USD 4.0 bn in 2024, heading to USD 5.8 bn by 2029 (7.9% CAGR). Two structural facts matter more than the size.
First, import substitution is measurable: global brands' share of the Indian market fell from 75% in FY18 to 60% in FY25, while organised Indian players rose from 15% to 30%. Tempsens sits at the pointy end — the only domestic non-contact maker, in a non-contact segment worth ~₹2.0 bn (~₹200 Cr) in India.
Global brands lost 15 points of the Indian market in seven years
Organised Indian players doubled their share from 15% to 30% — import substitution is the industry's structural story.
Second, demand is capex-linked and broad: chemicals & petrochemicals (21.1% of India demand), metals (20.6%), power (16.0%), oil & gas (15.4%). The DRHP leans on India's steel target of ~300 MTPA by 2030 and thermal power investments projected to double to ~₹2.3 lakh crore by 2027–28. The replacement market — 35–45% of India's market value — grows at an 8.5% CAGR and is the less cyclical, recurring layer. Contact sensors are 69.7% of the Indian market, non-contact 11.4%, allied products 18.9%.
The financials: three years that flatter the trend
Restated consolidated figures from the DRHP (₹ Cr):
| Metric | FY2023 | FY2024 | FY2025 | FY23–25 CAGR |
|---|---|---|---|---|
| Revenue from operations | 236.94 | 274.81 | 378.53 | 26.4% |
| EBITDA | 50.00 | 61.13 | 97.32 | 39.5% |
| EBITDA margin | 20.83% | 21.98% | 25.45% | — |
| PAT | 33.23 | 40.92 | 62.56 | 37.2% |
| PAT margin | 13.85% | 14.72% | 16.36% | — |
| Adjusted PAT | 33.23 | 40.92 | 66.30 | 41.3% |
Revenue rose 59.8% over two years; EBITDA rose 94.6%; PAT rose 88.3% (computed from DRHP figures).
PAT nearly doubled in two years while revenue rose ~60%
Margin expansion did more work than volume — EBITDA grew 94.6% on 59.8% revenue growth (computed from DRHP figures).
Cross-sell is a genuine lever: customers buying multiple product categories rose from 54.3% of revenue in FY23 to 57.9% in FY25. Exports more than doubled from ₹51.2 Cr to ₹100.2 Cr over the same window. Customer concentration is low — top 10 customers were 23.68% of FY25 revenue (top 1: 5.22%), across 3,500+ customers.
The working capital tell
This is where the DRHP's second story lives:
| Metric | FY2023 | FY2024 | FY2025 |
|---|---|---|---|
| Net working capital days | 168 | 152 | 193 |
| Inventory days | 145 | 125 | 157 |
| Trade receivable days | 55 | 61 | 62 |
| Trade payable days | 32 | 34 | 26 |
| Working capital loans (₹ Cr) | 16.39 | 19.78 | 58.75 |
| WC loans as % of total borrowings | 62.0% | 65.6% | 81.8% |
Net working capital days expanded from 152 to 193 in one year — higher inventory (157 days) and lower payables (26 days) both contributed. Working capital loans nearly tripled to ₹58.75 Cr, now 82% of total borrowings. For a business where 69.16% of FY25 revenue is project/OEM (up from 63.47% in FY23), the cash cycle is the number that will swing with order timing. The DRHP discloses no order book and notes most orders are placed on a spot or purchase-order basis — customers can reduce or discontinue orders at short notice.
Capacity: the new lines are not yet full
Capacity utilisation (own units): Unit I (temperature sensing) ran at 59.9% in FY25, down from 80.6% in FY24 — but its installed capacity was raised from 720k to 1,140k units during FY25, so absolute production rose while utilisation fell. Unit II (thermocouples/nickel alloys) was at 71.2%. Specialised cables ran 71.8–90.9% depending on unit/metric. Electrical heating utilisation more than doubled to 72.2% (from 37.2%) on the Marathon Heater addition. The fresh capex being funded by the IPO — ₹35.38 Cr on electrical heating and specialised cables — targets the two verticals with the most headroom.
The offer: ₹118 Cr fresh plus a 1.79 Cr-share OFS
The DRHP (Sep 29, 2025) structures the offer as:
| Component | Detail |
|---|---|
| Fresh Issue | Up to ₹1,180.00 Mn (₹118.00 Cr); share count set at price discovery |
| Offer for Sale | Up to 17,925,071 shares (1.79 Cr) across 5 selling shareholders |
| Pre-IPO placement | Permitted up to ₹236 Mn (₹23.60 Cr), reducing the fresh issue; IPO trackers report the final fresh component at ~₹95 Cr — consistent with the placement being fully used (interpretation) |
| Face value | ₹4 per share |
Finalised at the RHP stage (web reports, Aug 17–19, 2026): price band ₹285–300; lot size 50 shares, minimum retail investment ₹15,000; opens Aug 20, closes Aug 24; anchor allocation on Aug 19; tentative listing Aug 28 on BSE and NSE. Book running lead manager: ICICI Securities; registrar: KFin Technologies. Economic Times sizes the total issue at ~₹650 Cr; using the DRHP's OFS share count at the top of the band plus the ~₹95 Cr fresh component gives ~₹633 Cr (est., computed). Market cap at the upper band is reported at ₹2,514.98 Cr — an implied ~40x FY25 PAT of ₹62.56 Cr (est., computed; ~38x on adjusted PAT of ₹66.30 Cr). Grey-market indicators quoted on Aug 19 put the GMP at +175, implying ~₹475, ~58% above the upper band — unverified external data, indicative only.
Where the money goes
The DRHP earmarks 76.6% of the fresh issue (computed: ₹90.38 Cr of ₹118.00 Cr):
| Use | ₹ Cr | Schedule |
|---|---|---|
| Capex — electrical heating + specialised cables | 35.38 | ₹321.29 Mn in FY27, ₹32.50 Mn in FY28 |
| Pre-payment / repayment of borrowings | 55.00 | FY27 |
| General corporate purposes | Balance | Capped at 25% of gross proceeds |
The debt repayment matters: with working capital loans at 81.8% of borrowings, retiring ₹55 Cr of short-term debt directly relieves the interest line. The capex plan was board-approved Sep 29, 2025, based on internal estimates and a chartered engineer's cost assessment — not appraised by any bank.
Who is selling
The OFS has three promoter-group sellers and two others:
| Selling shareholder | Type | Shares offered |
|---|---|---|
| Amit Talesara | Promoter group | 3,636,909 |
| Puneet Talesara | Promoter group | 3,380,327 |
| Chandra Prakash Talesara | Promoter group | 3,635,945 |
| Ankit Talesara | Other | 3,635,945 |
| Nirmal Kumar Pande | Other | 3,635,945 |
Promoter-group sellers account for 59.4% of OFS shares (computed); OFS proceeds do not go to the company. The promoter group held 55.63% pre-offer (re-identified after FY24 to three individuals — Virendra Prakash Rathi, Vinay Rathi, Pratap Singh Talesara). After the OFS and fresh issue, the promoter stake is estimated at ~40–41% (est., computed from DRHP figures; the DRHP shows promoter-group family members holding additional shares, so the group figure could be higher).
The risks the prospectus itself names
- No listed Indian peers: the DRHP states no listed company in India operates the same multi-segment combination — so no peer-multiple anchor exists until the listing prints.
- Order book not disclosed: with 69.16% of revenue in project/OEM orders placed on a spot basis, quarterly revenue is inherently lumpy.
- Raw material exposure: copper & nickel were 24.49% of FY25 purchases; "precious metals" (including platinum) 4.29%. No commodity hedging is disclosed; the company aligns procurement with customer proposals on large orders, and small/urgent orders may not fully recover cost increases.
- Technology risk: MEMS-based and digital sensors could disrupt conventional thermocouple/RTD products.
- Competition: global majors (Endress+Hauser, WIKA, OMEGA, Honeywell) still dominate high-precision/smart sensing and continue investing in India.
What to watch
- The first post-listing quarterly numbers: how fast Unit I's newly-raised capacity (1,140k units) absorbs, and whether the electrical heating utilisation (72.2%) keeps climbing.
- Working capital days: whether 193 days of NWC was a one-off inventory build or the new normal; watch inventory days (157) and payable days (26).
- The ₹55 Cr debt repayment: its effect on interest cost and on the 81.8% short-term borrowing mix.
- Project order flow: with no disclosed order book and 69% of revenue in project/OEM work, order wins are the lead indicator.
- Copper, nickel and platinum prices: ~29% of purchases combined, unhedged.
Frequently asked questions
What does Tempsens Instruments do?
It designs and manufactures temperature sensing solutions (thermocouples, RTDs, thermowells, infrared pyrometers, thermal imagers, transmitters, fibre-optic sensors), electrical heating solutions, and specialised cables for industries from steel and cement to oil & gas, power, pharma, defence and renewables.
When does the Tempsens IPO open and close?
The offer opens Thursday, Aug 20, 2026 and closes Monday, Aug 24, 2026.
What is the Tempsens IPO price band and lot size?
The price band is ₹285–300 per share (face value ₹4). The lot size is 50 shares, so the minimum retail investment is ₹15,000 at the upper price.
How big is the Tempsens IPO?
Per the DRHP, a fresh issue of up to ₹118 Cr plus an OFS of up to 17,925,071 shares. IPO trackers report the final fresh component at ~₹95 Cr and Economic Times sizes the total issue at ~₹650 Cr.
What will the IPO money be used for?
₹35.38 Cr for capex on electrical heating and specialised cables, ₹55.00 Cr for repayment of borrowings, and the balance for general corporate purposes (capped at 25% of gross proceeds).
Is Tempsens the largest temperature sensor maker in India?
Per the DRHP's F&S report, yes — the largest contact and non-contact temperature sensor manufacturer in India by revenue with ~10% share, and the only Indian manufacturer of non-contact sensors (~18% of that segment).
What are the key risks in the Tempsens DRHP?
Working capital stretched to 193 days in FY25, project-heavy revenue with no disclosed order book, unhedged exposure to copper/nickel/platinum, technology disruption risk, and the absence of listed Indian peers for valuation context.
Data note
Business, financial and offer-structure facts above come from the Tempsens Instruments DRHP (dated September 29, 2025), retrieved from the document corpus. The final RHP was not available in that corpus; offer-stage parameters (price band, dates, lot size, market cap, GMP) are from external web reports dated August 17–19, 2026 and are unverified against the RHP itself — grey-market GMP figures are indicative only. Derived figures — implied P/E (~40x FY25 PAT), post-offer promoter stake (~40–41%), total issue size (~₹633 Cr), 76.6% earmarking, growth percentages — are estimates computed from DRHP figures (flagged "est."/computed). FY25 includes the Marathon Heater amalgamation and is not directly comparable to earlier years. The company had no post-IPO quarterly results at the time of writing (listing tentatively Aug 28, 2026) and was not yet present in the financials screener.
This is factual, educational analysis of public prospectus and market disclosures — not investment advice, and not prepared by a SEBI-registered research analyst. Verify offer details against the RHP before any decision.