Background:
The Datex-Ohmeda Modulus is used is to distribute and monitor anesthesia to patients. Doctors/Surgeons use anesthesia on patients to keep them in a state of sleep during surgery or other medical procedures. This allows the patient to be unconscious during a possibly very painful procedure and keeps them in a calm state. Since the patient has been put to sleep, they need something to breathe for them. This machine provides anesthesia and breathing support to the unconscious patient.
The ventilator of the machine keeps the patients' lungs moving by pumping them mechanically. The machine administers various gases to keep the patient asleep and safe. These administrations are visually monitored on the machine and have an alarm if the machine detects something wrong. It is of utmost importance that the patient's CO2 they breathe out is disposed of for their health, which is the job of the machine's gas disposal system. The machine comes with the ability to use with non-rebreathing circuits. (source)
The Datex-Ohmeda Modulus II can be purchased used for an average of $2000. (source) Sales for this device began in 1982 and ended with the release of the Datex-Ohmeda Modulus II Plus in 1989. (source) Both followed the release of the Datex-Ohmeda Modulus I, and each model improved the efficiency of the anesthesia distribution and monitoring.
This machine is not exclusive to certain countries or regions of the world and is available to any medical professionals who wish to use it. There are no widespread complaints about the functionality of this device, but there is one reported failure of the volume monitor caused by the overhead surgical lighting. However, this was temporary and resulted in no casualties or injuries. (source)
Source for the why and how of anesthesia machines here.
Identification:
The Datex-Ohmeda Modulus is made up of a ventilator, pneumatic circuitry, and the ventilator bellows assembly. The pneumatic circuitry comes with circuitry for oxygen and nitrous oxide, but up to three gases can be monitored with the Datex-Ohmeda Modulus, including CO2. Other optional additions include a pulse oximeter and blood pressure monitor attached to the machine. The machine has four pressure gauge window panels for air, nitrous oxide, oxygen, and carbon dioxide. The machine comes with two storage drawers. The reference number and serial number can be found on the back of the machine.
Technical Specifications:
Gas Machine Specifications
Height: 61 inches
Weight: 365 lbs (no additional equipment included)
Ventilator Specifications
Height for Control Module: 5.2 inches
Height for Bellows Assembly: 9.0 inches
Weight for Control Module: 11.2 lbs
Weight for Bellows Assembly: 4.0 lbs
Storage Temperature: Keep at -4 to +158°F with 0 to 100% non-condensing relative humidity
Operating Temperature: 50 to 104°F
Drawer Dimensions:
Two 10.5 x 4 x 15 inch drawers
Other
Includes:
-oxygen outlet
-foot bar break
Source: Here