Fisher & Paykel MR850 Humidifier with Heated Wire Circuit and Temperature Probe

Q: We run both ventilated and NIV patients in our ICU — does the MR850 need to be switched between units, or can one device handle both?

A single MR850 unit handles both scenarios without any hardware change. Pressing the mode button toggles between Invasive Mode (37 °C / 44 mg/L for intubated patients) and Non-Invasive Mode (31 °C / 32 mg/L for mask-based therapy). This means one device can follow a patient across therapy transitions — from NIV to intubation — reducing equipment cost and setup time.

Q: What exactly does the temperature probe do, and is it reusable or single-use?

The temperature probe (Ref. 900MR86X) contains two sensing points — a Chamber Probe and an Airway Probe. They feed real-time temperature data back to the heater base, which uses this information to fine-tune power output to both the heater plate and the heated circuit wires. This closed-loop feedback is what makes the MR850's delivery accurate to ± 0.3 °C. The probe is reusable and can be cleaned with isopropyl alcohol — it must not be autoclaved or immersed in liquid.

Q: Is the MR850 safe for use with neonates? Our NICU runs very sensitive patients.

Yes — the MR850 is explicitly designed for adult, pediatric, and neonatal patients. The temperature alarm triggers immediately at 41 °C (display) or 43 °C (airway probe), with automatic shutdown of both the heater plate and heater wire. For neonates, this rapid, hardware-level overheat protection is critical. The system also supports low flow rates appropriate for neonatal circuits. Fisher & Paykel Healthcare has published clinical evidence supporting its use in neonatal populations across prematurity and respiratory distress conditions.

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Clinical-Grade Humidification for Every Stage of Respiratory Care

The Fisher & Paykel MR850 is a heated respiratory humidifier engineered for use in hospital intensive care units. It warms and humidifies breathing gases delivered to patients on mechanical ventilation, positive pressure support, or supplemental oxygen therapy — preserving the natural mucociliary function of the airway and reducing the risk of secretion retention and infection.

What sets the MR850 apart is its dual-mode intelligence. A single button toggles between Invasive Mode (37 °C, 44 mg/L — body temperature with full saturation) for intubated patients, and Non-Invasive Mode (31 °C, 32 mg/L) for patients on mask-based therapy. Built-in ambient sensing algorithms continuously adjust heater plate output to compensate for changes in room temperature, maintaining consistent humidity delivery without manual intervention.

The system ships as a complete, ready-to-use package comprising the MR850 heater base, a heated-wire adapter, and a reusable temperature and flow probe (Ref. 900MR86X). The temperature probe connects to the blue socket on the heater base and feeds real-time gas temperature data from both the chamber outlet and the patient airway — enabling precise closed-loop power control across both the heater plate and the heated circuit wires.

Suitable for adult, pediatric, and neonatal patients, the MR850 supports the full Fisher & Paykel Respiratory Care Continuum — from invasive ventilation and NIV through to Optiflow high-flow oxygen therapy. Its service life of 7 years and straightforward surface-cleanable design make it a durable, cost-effective choice for Indian hospitals and critical care facilities.

Package Includes

MR850 heater base + heated-wire adapter (Ref. 900MR8XX) + temperature & flow probe (Ref. 900MR86X). Humidification chamber and breathing circuit ordered separately.

Authorized Source in India

Procured through Shah Trading Corporation — ensuring genuine F&P Healthcare products, local support, and service documentation compliance.

Key Features

Dual-Mode Operation - One-button switch between Invasive (37 °C / 44 mg/L) and Non-Invasive (31 °C / 32 mg/L) modes — covering the full range of ventilatory support with clinically targeted humidity levels.

Closed-Loop Temperature Control - The temperature probe provides continuous feedback from the chamber and airway, allowing the MR850 to automatically adjust heater plate power for stable, precise gas delivery.

Heated Wire Circuit Integration - The heater-wire adapter powers both the inspiratory and expiratory limbs of the breathing circuit, keeping water vapour above dew point to minimize condensate ("rain-out") in the tubing.

Clinically Based Alarm System - Medium-priority alarms trigger immediately at ≥ 41 °C displayed temperature or ≥ 43 °C airway probe reading. Automatic heater shutdown with flashing display protects patients from overheating.

Ambient Environment Compensation - Built-in algorithms detect changes in room temperature and automatically adjust output — preventing inconsistent humidity delivery without clinician intervention.

Universal Patient Suitability - Supports adult, pediatric, and neonatal patients. Compatible with the full F&P Respiratory Care Continuum — from ICU invasive ventilation to Optiflow high-flow nasal therapy.

Flow-Sensing Intelligence - Integrated flow sensing up to 60 LPM (invasive) and 120 LPM (non-invasive) allows the system to optimize humidity output dynamically, reducing nuisance alarms during variable ventilation.

Auto Standby & Power Safety - Auto-standby mode reduces unnecessary power use between patient connections. Thermal cutout at 118 ± 6 °C on the heater plate ensures a fail-safe hardware protection layer independent of software.

Technical Specifications

Parameter	Value / Range
Operating Modes	Invasive (37 °C, 44 mg/L) \| Non-Invasive (31 °C, 32 mg/L)
Invasive Mode Temp. Range	35.5 °C – 40 °C (adjustable)
Non-Invasive Mode Temp. Range	31.0 °C – 36.0 °C (adjustable)
Display Temperature Range	10 °C – 70 °C
Temperature Probe Accuracy	± 0.3 °C (in 25 – 45 °C range)
Gas Temperature Measurement Accuracy	± 2 °C
High Temperature Alarm — Displayed	≥ 41 °C (Medium Priority, immediate)
High Temperature Alarm — Airway Probe	≥ 43 °C (Medium Priority, immediate)
Flow Range — Invasive Mode	Up to 60 LPM
Flow Range — Non-Invasive Mode	Up to 120 LPM
Heater Plate Capacity	150 W at nominal mains voltage
Heater Plate Thermal Cutout	118 ± 6 °C
Heater Wire Supply	22 V~, 60 W max
Total Max. Power Consumption	210 W
Supply Voltage (India — AXX variant)	230 V~, 50/60 Hz, 1.0 A max
Dimensions (without chamber)	140 × 173 × 135 mm
Weight (without chamber)	2.8 kg
Weight (with filled chamber)	3.1 kg
Warm-Up Time	< 30 minutes
Recommended Ambient Temperature	18 °C – 26 °C
Temperature Probe Ref. No.	900MR86X (reusable; not for autoclave)
Heater-Wire Adapter Ref. No.	900MR8XX
Cleaning Agent (Heater Base)	Isopropyl alcohol or standard dishwashing detergent (damp cloth only — do not immerse)
Service Life	7 years (designed for daily hospital use)
Intended Setting	Hospital ICU / Critical Care
Patient Population	Adult, Pediatric, Neonatal
Mounting Options	Flat surface, ventilator rail, pole stand (via Mounting Bracket 900MR303)

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Frequently Asked Questions

We run both ventilated and NIV patients in our ICU — does the MR850 need to be switched between units, or can one device handle both?

A single MR850 unit handles both scenarios without any hardware change. Pressing the mode button toggles between Invasive Mode (37 °C / 44 mg/L for intubated patients) and Non-Invasive Mode (31 °C / 32 mg/L for mask-based therapy). This means one device can follow a patient across therapy transitions — from NIV to intubation — reducing equipment cost and setup time.

What exactly does the temperature probe do, and is it reusable or single-use?

The temperature probe (Ref. 900MR86X) contains two sensing points — a Chamber Probe and an Airway Probe. They feed real-time temperature data back to the heater base, which uses this information to fine-tune power output to both the heater plate and the heated circuit wires. This closed-loop feedback is what makes the MR850's delivery accurate to ± 0.3 °C. The probe is reusable and can be cleaned with isopropyl alcohol — it must not be autoclaved or immersed in liquid.

Is the MR850 safe for use with neonates? Our NICU runs very sensitive patients.

Yes — the MR850 is explicitly designed for adult, pediatric, and neonatal patients. The temperature alarm triggers immediately at 41 °C (display) or 43 °C (airway probe), with automatic shutdown of both the heater plate and heater wire. For neonates, this rapid, hardware-level overheat protection is critical. The system also supports low flow rates appropriate for neonatal circuits. Fisher & Paykel Healthcare has published clinical evidence supporting its use in neonatal populations across prematurity and respiratory distress conditions.