10
G
PREMASGARD
®
121x - Modbus
Rev. 2018 - V15 GB
TECHNICAL DATA
Power supply:
24 V AC (± 20 %) and 15...36 V DC
Power consumption:
< 1 VA ⁄ 24 V DC, < 2.2 VA ⁄ 24 V AC
Measuring ranges:
–1000...+1000 Pa
or
–5000...+5000 Pa,
depending on the type of device, see table
Media temperature:
–20...+50 °C
Pressure connection:
4 ⁄ 6 x 11 mm (hoses Ø = 4 ⁄ 6 mm),
metal pressure connection nozzles
Type of pressure:
differential pressure
Medium:
clean air and other non-aggressive, non-combustible gases
Accuracy:
Type 1211
(1000 Pa): ± 5 Pa
Type 1215
(5000 Pa): ± 25 Pa
compared to the calibrated reference device
Zero point offset:
± 10 % of pressure range (selectable using the offset
calibration button with potentiometer on circuit board
or using the Modbus interface by remote maintenance)
Above- ⁄ below-pressure: max. 5 x pressure range
Long-term stability:
± 1 % per year
Hysteresis:
0.3 % of final value
Media contacting parts:
ms, Ni, Nylon, PU, Si, PVC with plasticisers
Temperature drift values: ± 0.1 % of final value ⁄ °C
Linearity:
< ± 1 % of final value
Bus parameters:
can be configured and addressed
via DIP switches
in the
absence of current delivery
(under currentless conditions)
Bus interface:
RS 485,
galvanically isolated,
Bus termination activatable
via DIP switches. Up to 32 devices possible in one segment.
In case of a greater number of devices, RS485 transceivers
must be used.
Bus protocol:
Modbus (RTU mode), address range 0...
247
selectable
Baud rate:
9600, 19200, 38400 Baud
Status indicator:
LED green = Telegram valid / LED red = Telegram error
Signal filtering:
4 s / 32 s
Enclosure:
plastic, UV-stabilised, material polyamide, 30 % glass-globe
reinforced, with quick-locking screws (slotted ⁄ Phillips head
combination), colour traffic white (similar RAL 9016),
enclosure cover for display is transparent!
Enclosure dimensions:
72 x 64 x 37.8 mm (Tyr 1 without display)
72 x 64 x 43.3 mm (Tyr 1 with display)
Cable gland:
2x M 12 x 1.5 (Y-adapter); with strain relief, exchangeable,
max. inner diameter 6 mm
Permissible air humidity: < 95 % r. H., non-precipitating air
Protection class:
III (according to EN 60 730)
Protection type:
IP 65 (according to EN 60 529)
Standards:
CE conformity, electromagnetic compatibility
according to EN 61 326, EMC directive 2014 ⁄ 30 ⁄ EU
Features: two-line
display with illumination,
programmable, cutout
approx. 36 x 15 mm (W x H), to display ACTUAL pressure
or an individually programmable display value (The Modbus
interface allows the display to be individually configured in the
7-segment area and in the dot-matrix area.)
TYPES OF MONITORING:
(A) Below-atmospheric pressure:
P1 (
+
) is not connected but
open against atmosphere
P2 (
–
) connected to inside of duct
(B) Filter:
P1 (
+
) connected upstream of filter
P2 (
–
) connected downstream of filter
(C) Ventilator:
P1 (
+
) connected downstream of ventilator
P2 (
–
) connected upstream of ventilator
Pressure connections at the pressure switch
are marked with
P1 (
+
) for higher pressure and
P2 (
–
) for lower pressure.
The calibratable
PREMASGARD
®
121x - Modbus
series
compact pressure sensors with Modbus connection are
optionally equipped with display and are used for measuring
above-atmospheric, below-atmospheric, or differential
pressures of air. The piezo-resistive measuring element is
temperature-compensated and guarantees high reliability
and accuracy. The pressure transmitters are provided with
a push-button for manual zero point calibration and an
adjustable offset. Applications of these pressure sensors
are in cleanroom, medical and filter technology, at ventila-
tion and air conditioning ducts, at spray booths, in large-
scale catering facilities, for filter monitoring and level
measurement, or for triggering frequency converters. Media
measured with these pressure transducers are air
(non-precipitating), or other gaseous non-aggressive, non-
combustible media. These differential pressure sensors are
supplied including connection set
ASD-06
(2 m connection
hose, two pressure connection nipples, screws).
Mounting diagram
PREMASGARD
®
121x - Modbus
110 Pa
110 Pa
110 Pa
110 Pa
110 Pa
110 Pa
110 Pa
110 Pa
110 Pa
(A)
(B)
(C)
Measuring Range
Pressure range
Type ⁄ WG01
PREMASGARD
®
121x - Modbus
Output Display Item No.
– 1000... + 1000 Pa
P REM A S G A RD 1211- M
Modbus
1301-1214-0010-200
– 1000... + 1000 Pa
P REM A S G A RD 1211- M DISP L AY
Modbus
■
1301-1214-2010-200
– 5000 ... + 5000 Pa
P REM A S G A RD 1215 - M
Modbus
1301-1214-0050-200
– 5000 ... + 5000 Pa
P REM A S G A RD 1215 - M DISP L AY
Modbus
■
1301-1214-2050-200
Accessories
ASD-06
Connection set (included in the scope of delivery),
consisting of
2 connection nipples (straight) made of ABS, 2 m PVC hose, soft, and 4 tapping screws
7100-0060-3000-000
ASD-07
2 connection nipples
(at 90 degree angle) made of plastic, ABS
7100-0060-7000-000
DAL-01
Pressure outlet
for ceiling or in-wall installation (e.g. in clean rooms)
7300-0060-3000-001
WS-04
Sunshade and weather protection,
130 x 180 x 135 mm, stainless steel
7100-0040-7000-000
