RKI RI-257 Gas Monitor, NDIR, 4-20 mA, Wall Mount

RKI Instruments

RKI RI-257 Gas Monitor, NDIR, 4-20 mA, Wall Mount

SKU: IMM_23551567Brand: RKI Instruments
$2,626.00 USD

Card or bank transfer · proforma invoice on request

We ship worldwideTraceable calibration documents
RKI RI-257 Gas Monitor, NDIR, 4-20 mA, Wall MountOverviewThe RKI RI-257 is a wall-mount NDIR gas monitor with a built-in sample-draw pump for FC, HFC/HCFC (Flon) gases and IPA. Ordering specifies one gas and range: FC-14, FC-116, FC-C318, Flon 23, Flon 32, Flon 41, Flon 134a (Vertrel XP), Flon 225 or IPA. Ranges run from...

Get a firm price

Ordered from the manufacturer for you. Send this form; we typically reply within one working day.

Add company, phone or a note
  • Typical reply: one working day
  • Proforma invoice on request
  • Pay by card or bank transfer
  • 30-day money-back on defects
We ship worldwide · Prices in USD
  1. 1Send the requestTakes a minute
  2. 2Get your priceTypically one working day
  3. 3Pay, we shipCard or bank transfer
  • 30-day money-back if the item arrives defective, damaged or wrong. Policy
  • Traceable calibration documentation ships with instruments
  • Pay by card or bank transfer, invoice on request
  • We ship worldwide. Destination confirmed with your quote

Datasheets & manuals

ShippingWe ship worldwide
DocumentsTraceable calibration documentation
Quote responseTypically within one working day

RKI RI-257 Gas Monitor, NDIR, 4-20 mA, Wall Mount

Overview

The RKI RI-257 is a wall-mount NDIR gas monitor with a built-in sample-draw pump for FC, HFC/HCFC (Flon) gases and IPA. Ordering specifies one gas and range: FC-14, FC-116, FC-C318, Flon 23, Flon 32, Flon 41, Flon 134a (Vertrel XP), Flon 225 or IPA. Ranges run from 0-5,000 ppm (25 ppm/digit) to 0-10,000 ppm (50 ppm/digit), with Flon 41 at 0-5.000 vol% (0.025 vol%/digit), each with its factory alarm setpoint.

Features

  • NDIR sensing, negligible interference from other gases
  • Built-in continuous sample-draw pump
  • Orderable for FC, HFC/HCFC (Flon) gases and IPA in fixed ranges
  • Dual WARNING/ALARM lamp and contact output (b contact optional) rated AC125V 0.1 mA-0.5 A
  • 4-20 mA external output, max 300 Ω load
  • Repeatability ±3% of F.S., alarm delay within 30 s at 1.6× setpoint
  • Compact wall-mount housing, approx. 3.8 kg

Applications

  • Cleaning-process vapor monitoring with fluorinated solvents
  • Cold-storage and drying-room leak detection
  • Refrigerant monitoring in industrial refrigeration

What's in the Box

  • Fuse
  • Dust filter
  • Instruction manual
  • Test certificate

RKI RI-257 Gas Monitor, NDIR, 4-20 mA, Wall Mount Technical Specifications

  • Detection principle: NDIR (non-dispersive infrared)
  • Sampling method: Sample-draw by built-in pump
  • Measurable gases: FC, HFC/HCFC (Flon) compounds and IPA
  • Example range: 0-10,000 ppm (50 ppm/digit) or 0-5,000 ppm (25 ppm/digit)
  • Alarm point: Dual alarm (WARNING/ALARM), lamp display (yellow/red)
  • Contact output: a contact (b contact optional), AC125V 0.1 mA-0.5 A
  • External output: 4-20 mA, max 300 Ω (resistance load)
  • Repeatability: ±3% of F.S.
  • Alarm delay: within 30 s at 1.6× the alarm preset point
  • Warm-up: 60 min (measurement starts 2 min after power on)
  • Power source: AC 100 V, 117 V or 220 V ±10%, 50/60 Hz, max 50 VA
  • Ambient conditions: 0 to +40°C, 30-90% RH non-condensing
  • Mounting: Wall mount
  • Dimensions / weight: approx. 180 (W) × 355 (H) × 97 (D) mm, approx. 3.8 kg

Manufacturer information: RI-257 datasheet on rkiinstruments.com CDN.

Price $2,626.00 USD as listed on 05 Nov 2026. Request a firm quote: https://na.indomultimeter.net/products/rki-ri-257-gas-monitor-ndir-4-20-ma-wall-mount

Before you order

Is the price final?

The price shown is our current price in USD. Your quote confirms price and availability for your quantity.

How is my item supplied?

Items are ordered from the manufacturer for you. The quote confirms availability. Typical response is within one working day.

Do you provide calibration certificates?

Instruments ship with calibration documentation traceable to national standards. Ask in your request if you need a specific certificate.

How can I pay?

By card or by bank transfer. We can send a proforma invoice for your purchasing department.

Do you ship to my country?

We ship worldwide. Put your destination country in your enquiry and we confirm delivery with your quote.

What if it arrives defective, damaged or wrong?

You get a 30-day money-back guarantee for items that arrive defective, damaged or wrong. See the refund policy.