ENMET ISA-RAL-M - Manual (Page 5)

ISA-RAL-M, ISA-RAH-M ENMET Corporation
1
1.0 1.0 Introduction Introduction
Sandblasting, welding, and spray painting are examples of activities that create potentially hazardous environments.
Such environments contain toxic gases, dust and fumes. An air compressor system with hoods or masks supplies clean
breathing air to workers and minimizes the risk of injury or death; however, carbon monoxide (CO) can contaminate
the air in a compressor system. Carbon monoxide contamination can occur either when the intake air itself is
contaminated, or when the compressor breaks down and overheats. Because of this hazard, Federal OSHA regulations
(Sec. 1910.134) require monitoring of CO in compressed air systems. In addition, the Compressed Gas Association
has set up guidelines governing maximum tolerable levels of CO and other contaminants (Spec. G-7.1) to ensure the
health and safety of persons who use respiratory air lines.
The ENMET ISA-RAL-M (See Figure 1) monitors the carbon monoxide in compressed air used for human breathing.
If the CO concentration exceeds any predetermined levels, the ISA-RAL-M will triggers audio-visual alarms and
activates any associated equipment to alert personnel in potential danger.
N OTE : All specifications stated in this manual may change without notice.
1.1 Operation Principle
The ISA-RAL-M is an all-solid state electronic gas-detecting instrument designed to continuously monitor the carbon
monoxide level in compressed air. The sensing element is a gas-sensitive metallic-oxide semiconductor (MOS). A
regulator-humidifier assembly collects and humidifies a small air sample from the respiratory air line and passes it
over the sensor. When the level of CO in the air passing over the sensor increases to preset values, the instrument
alarms with audio (horn) and visual (light) signals.
The ISA-RAL-M operates from single-phase 110 Vac, single-phase 220 Vac and/or 12 Vdc power and is equipped
with relay contacts to provide additional alarm signals.
1.2 ISA-RAH-M High Pressure Monitor
The ISA-RAH-M is designed to monitor breathing air from cylinders at pressures up to 5000 psi. The equipment
consists of an ISA-RAL-M with the addition of a high-pressure regulator at the sample air input as shown in Figure 2.
The high pressure regulator must be plumbed into the high pressure line with an appropriate fitting; the output is
connected to the ISA-RAL-M by means of a quick release pneumatic fitting. The operation of the ISA-RAH-M is
identical with that of the ISA-RAL-M, and calibration is also identical; the high pressure regulator is removed from the
sample input and the calibration procedures given in this manual are employed.
1.3 Hydrocarbon Filter
There are two versions of the ISA-RAL-M:
P/N 04526-001 is supplied with a hydrocarbon filter
P/N 04526-003 is supplied without a hydrocarbon filter
2.0 Upon Receipt 2.0 Upon Receipt
1. Unpack and inspect your new ISA-RAL-M for damage, which might have occurred during shipment.
2. Make sure the instrument is calibrated according to your order.
3. Do not use damaged or incorrect equipment. If there is a problem, contact your distributor or ENMET personnel
immediately.
4. Read this manual thoroughly to assure proper handling, operation, and maintenance of your ISA-RAL-M.