2. SPECIFICATIONS
Supply voltage
MD-2, MD-4 - 230V AC, 50Hz (allowed voltage fluctuations: +10%,-14%)
MD-2.A, MD-4.A - 12V DC ( allowed: 10.5V ÷ 13.8V=)
Power consumption
max. 15W (MD-...A : max 12W)
Operating temperature
+5
C to 35
C
recommended optimal,
-10
C
to
+40
C
allowed constantly
,
-15
C to 45
C
allowed periodically (<2h/24h)
Number of measurement
channels
2
, two-threshold detectors
( MD-2... )
4
, two-threshold detectors
( MD-4... )
Alarm thresholds
two:
warning -
ALARM 1
(
A1
), alarm -
ALARM 2
(
A2
)
Alarm memory
for each channel and each level - optical, joint acoustic,
output signal memory
of
each level – optical (possibility to deactivate
with W2 function switch „BEZ PAM.”)
Memory resetting
using button on front plate (accessible when cover lifted)
Signal interlock
inputs: approx.
60
s, after turning the power on;
outputs: approx.
20
s (delay), possibility of permanent interlock (service
mode) using W2 function switch „SERWIS”
Optical indication (for each
detector and output)
A1
– red LED – 1st gas concentration threshold exceeded
A2
- red LED – 2
nd
gas concentration threshold exceeded
Acoustic indication
internal piezoceramic siren (intermittent signal = module requires
servicing), volume: approx. 60dB/1m;
possibility of shutting down (using W2 function button „CISZA”)
Supplying power to sensors 9V DC, short-circuit- and overcurrent-protected 200mA
Failure indication
yellow LED
Detector power on indicator green LED (separate for each detector), overload indication
Quick release of output
signals
manual, using „TEST” button under terminal strip cover, simultaneous for
both thresholds
Unit powering control
green LED; indicates also heating state
Contact outputs
NC and NO for
A1, A2
, voltage-free;
current-carrying capacity: max. 4A (with resistance load) or max. 2A (with
inductive load -motors) or max. 0.6A (with purely inductive load –
fluorescent lamps); max. 250V AC or 24V DC;
NO and NC for
AWARIA
(FAULT)
, voltage-free,
current-carrying capacity: max. 4A (with resistance load) or max. 2A (with
inductive load); max. 30V AC or 24V DC
Voltage outputs
12V DC , not stabilized for A1 and A2 states, total load = max. 0.3A, for
connection of SL..., S-3, LD... signalling devices
12V DC continuous, not stabilized, for powering MDX module or other
devices, max. load 0.2A
Alarm inputs
12V DC voltage inputs (5÷ 16V, max. 20mA) for A1, A2;
instantaneous, galvanically isolated from other MD circuits;
for cascade connection of modules or other devices
Overload protections
fuse of primary 230V AC or 12 V DC supply circuit, self-resetting fuses with
shorting current limitation of NAP.12V outputs, electronic fuses with current
limitation for each detector
Dimensions, weight
215 x 240 x 115
mm, (H x W x D in mounting positions); approx. 1.5kg
Housing
ABS, 6 cable glands,
IP54
, 3-point mounting
MD-2(4).( A ) Control Unit, User’s Manual edition 2U3en
gazex’2011 v1108
Page
3
/14
Fig.2. Required mounting area
Template for hole
drilling is located
on cardboard box lid.
~ 2
40
min
im
um
Mounting space
198
~1
20
13
7
21
5
Cable mounting space
Mounting
holes
240
12
0
Top view
