---
title: SRP-400 Retractable Sample Probe | Sarvesh
url: https://www.sarveshanalytics.com/retractable-sample-probe.html
description: SRP-400 retractable sample probe, up to 100 kg/cm2: insert or remove on a live line, non fly-off design, no welding on the sample path, safe bleed.
updated: 2026-11-03
source: html
---

Sample extraction · Live lines

# SRP-400 retractable sample probe

Insert or withdraw the probe on a live line rated to 100 kg/cm², and service it without stopping the process. A non fly-off design, pressure gauge and orifice-controlled bleed make retraction safe, and there is no welding on the sample path.

- ISO 9001:2015, certified by TÜV
- Designed and built in Pune since 2002
- Supplied to Reliance, Tata Steel, Indian Oil, Linde and ISRO

 Quick answer

SRP-400 is a retractable sample probe with no welding on the sample path, separate sample and bleed ports, pressure indication and orifice-controlled safe bleed, so the probe can be removed and serviced under process pressure without a shutdown.

Updated 3 November 2026 · Figures from Sarvesh datasheets

## Why SRP-400 retractable sample probe

### Service without a shutdown

The probe tube glides through a fitting rated to 100 kg/cm², with retraction lengths up to 800 mm.

### Safe by design

Non fly-off construction, a three-way bleed valve, pressure indication and an orifice-controlled bleed.

### A clean sample path

No welding on the sample path, negligible dead volume, and NACE compliance available.

## Specifications

| Item | Specification | Notes |
|---|---|---|
| Design | 100 kg/cm2 and 180 C maximum | Wetted parts SS316, PTFE, Viton; NACE compliance available |
| Process connection | 1.5 or 2 inch ANSI #300 or #600 |  |
| Sample tube | 12 mm OD, 8 mm ID | Retraction length 200, 400, 600 or 800 mm |
| Sample outlet and bleed | 1/4 or 1/8 inch OD | Three-way ball valve for bleed |
| Safety | Non fly-off design; pressure gauge for safe bleed; orifice-controlled bleed | Gauge 25 or 40 kg/cm2 by rating |
| Options | Process isolation valve (two-way ball valve) |  |
| Sample path | No welding; negligible dead volume |  |

From the current Sarvesh product datasheets and company profile. Specifications may change without notice as products improve. The final responsibility to check that a product meets the process and analyser requirement remains with the customer.

## Key features

- Retract the probe for filter service without shutting down the process
- Pressure indication tells you when it is safe to withdraw
- Orifice-controlled bleed vents the pressure slowly

## How it works

In pressurised ducts and vessels, a fixed probe cannot be removed without a shutdown. A retractable probe isolates the process, bleeds the pressure through a controlled orifice, and withdraws, so filters and elements are serviced on a running plant.

Avoiding welds on the sample path removes crevices that hold condensate and corrode. The pressure indication tells the maintainer whether bleeding is complete.

## Requirements and limits

- Design pressure 100 kg/cm2 and design temperature 180 C maximum; confirm the rating for your process connection.

## Selection guidance

Choose SRP-400 for pressurised processes, hazardous gas and long-running plants where shutdowns are costly. For wet analysis see the SV-400 vaporiser.

## Applications

Application pages where this is part of the recommended solution:

- [Steel plant process gases](https://www.sarveshanalytics.com/applications/steel-plant-process-gas-analysis.html)
- [Pyrolysis, gasification and syngas](https://www.sarveshanalytics.com/applications/pyrolysis-gasification-and-syngas.html)

## Compatible products

[

### SP and SRP sample probes

Heated and non-heated probes with blowback, and retractable probes, in SS316, Inconel or ceramic. View SP and SRP sample probes

](https://www.sarveshanalytics.com/sample-probes.html)[

### i-Cons

Smart Peltier sample conditioner with diagnostics, auto blowback and Modbus, in a compact 19 inch cabinet. View i-Cons

](https://www.sarveshanalytics.com/smart-systems-for-gas-analyser.html)[

### SV-200 / SV-400 vaporisers

Sample vaporisers for cryogenic and wet samples with no loss of sample. View SV-200 / SV-400 vaporisers

](https://www.sarveshanalytics.com/sample-vaporisers.html)[

### Headline filters

Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection. View Headline filters

](https://www.sarveshanalytics.com/headline-filters.html)

## Frequently asked questions

**Why retractable?**

So the probe can be serviced under process pressure without a shutdown.

**How is pressure bled?**

Through an orifice, with pressure indication.

**What about the sample path?**

There is no welding on it.

**Which gases?**

Any that suit the probe materials; send your composition.

## Related pages

- [Sampling components and systems](https://www.sarveshanalytics.com/sampling-components.html)
- [SGI-300](https://www.sarveshanalytics.com/sample-coolers.html)
- [i-Cons and SGI-320](https://www.sarveshanalytics.com/smart-systems-for-gas-analyser.html)
- [Sample probes SP-100, SP-200 and SP-300](https://www.sarveshanalytics.com/sample-probes.html)
- [Sample vaporisers SV-200 and SV-400](https://www.sarveshanalytics.com/sample-vaporisers.html)
- [Headline filters](https://www.sarveshanalytics.com/headline-filters.html)
- [Engineered analyser panels](https://www.sarveshanalytics.com/analyser-sampling-panels.html)
- [**Browse all gas analysers**](https://www.sarveshanalytics.com/gas-analyser.html)