6 | Operating Manual GW 601 | Functional range
3. Functional range
The gas warning device is a stationary measuring, control and warning device that is in continuous opera-
tion and is used to measure toxic gases. It consists of several components that act as a single unit. It is both
reliable and easy to assemble and maintain.
The gas warning device is part of the safety system for gas conducting systems and can be used with the
following gases:
Transmitter
Measuring gas
CM 601
Chlorine gas (Cl
2
)
DM 601
Chlorine dioxide (ClO
2
)
OM 601
Ozone (O
3
)
Table 3.1: Measuring gas, other gases on request
Chlorine gas application
The CM 601 transmitter is installed in the chlorine gas room; at a freely accessible location approx. 30 cm
above the floor. Chlorine gas is heavier than air and descends when it escapes. The sensor detects escaped
chlorine gas. The electronic system of the CM 601 transmitter records the sensor signal and converts it into
an impressed current of 4 – 20 mA which is transmitted to the GW 601 gas warning device. The 4 … 20
mA signal is evaluated in the gas warning system GW 601 and displayed as chlorine content in the air. If
the alarm thresholds set have been exceeded, alarm conditions are displayed or relays switched to notify
the relevant persons.
3.1 Measurement amplifier GW 601
The measurement amplifier GW 601 is the central control unit and is installed where it can be accessed by
operators. It allows measurements to be checked and alarm thresholds set.
The gas warning system receives the 4 … 20 mA signal from the transmitter and evaluates it. The digital
display shows the gas content of the air in the monitored room.
The gas warning system can be configured without the transmitter being attached.
3.2 Transmitter
The transmitter consist of
• a sensor block (sensor and sensor guard)
• an evaluation and amplification electronic system (sensor board)
It has a robust and corrosion-proof housing for industrial applications.
The sensor is an electronic measuring cell that works according to the electro-chemical principle. The
sensor block in the transmitter is easy to replace.
The transmitter allows for monitoring, calibration and adjustment. The sensor board converts the sensor
signal into a 4 … 20 mA analog signal. The connecting cable supplies power to the sensor circuit board
and transmission of the measurements.
3.3 Power supply backup system (accessory)
The backup system is a uninterruptible power supply (battery) that feeds the gas warning device system in
the event of a power failure. This supply will keep the device working for approximately 10 hours.
Summary of Contents for GW 601
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