Installation, Operating and Maintenance Instructions
3/7
for Alarm Switchgear AS1-M
2331.827/03-EN
Date: 2015/10/04
1. Technical Description and Field of Application
KSB Alarm Switchgear AS1-M
The AS1-M alarm switchgear, used in conjunction with the M 1 (K) alarm contactor,
can report impermissibly high water levels.
The M 1 (K) alarm contactor has a connection cable with a jack plug for connecting to
the AS1-M alarm switchgear.
The AS1-M alarm switchgear is fitted with a SCHUKO plug that is inserted into a
230 V AC SCHUKO socket (type C+E). In the event of a power failure, the operative
function is maintained for approximately 5 hours via a 9 V NiMH battery. The 9 V
NiMH battery is supplied fully charged. During normal mains-powered operation a
permanent trickle charge is provided (refer to Section 2 of these instructions:
Excessive Discharging).
A switch on the underside of the housing can be used to turn the AS1-M alarm
switchgear on and off. Pressing the switch in turns the device off; releasing the switch
turns the device on.
When the AS1-M alarm switchgear is turned on, an alarm is emitted as soon as the
liquid level raises the float switch of the M 1 (K) alarm contactor. The alarm stops as
soon as the liquid level causes the float switch to travel downward again.
The AS1-M alarm switchgear features a monitored jack socket so that when the
device is turned on and the jack plug is pulled out, an alarm is also triggered. No alarm
is triggered, however, in the event of a broken wire in the connection cable.
Technical data
Mains voltage
AC 230 V ±10 %/50 - 60 Hz
Power input
Approx. 3 VA
Rechargeable battery
9 V NiMH battery; provided with a permanent trickle
charge during mains operation
Service life of battery
Approx. 7 years but only if excessive discharging is
avoided
No-load voltage
DC 9 V
Housing
Upper section made from ABS; lower section made
from PC/ABS with integrated SCHUKO plug,
dimensions excluding plug: 120 x 65 x 40 mm
Enclosure
IP 20; for interior application only
Temperature range
0 C to +40 °C
Altitude requirements
Max. of 1,000 m above sea level
Sound pressure level of buzzer Approx. 95 dB at a distance of 0.1 m