Type / N°
Rev.
Fw
Date
Page
Total pages
EW055.600D
D
4L
6
th
June 2018
4
43
EsiWelma
®
s.r.l.
1. TECHNICAL DESCRIPTION
TW1 electronic computing head is designed to operate on one-nozzle fuel dispensers, using
one or two-sided display systems. It can communicate with a Host sending data concerning
the refuelling during the process and/or at the time of the device.
1.1. Structural specifications
The computing head is composed of:
One
CPU board
of a supplier and communication
interface. Each assembly is settled into a metallic
box to be protected both mechanically and against
EMI interferences;
One
board for set-up/price changing
settled into a
Photo 1: CPU
plastic box. This assembly can be put by the
customer in the most comfortable place or inserted
by convenience;
One or two
display boards
, optionally settled
in a metallic box.
Photo 2: Set-up / Price Changing
1.2. Technical data
Power supply:
230Vac
10%
Power consumption:
10VA
Temperature:
min.
–40°C max 70°C
Photo 3: Display
Humidity (no dew):
95%
Max flow rate:
3.5Kg/s or 3.5Sm³/s
(see Setup)
Measure:
1dag
or 10dm³
(see Setup)
Solenoid valve control:
N.O. max 270Vca/3A Standard /1A Atex
(*)
Measuring device inlet:
Pulses
→
one channel:
1 pulse = 10g
Serial
→
ModBus:
A-B channel
Protection grade
IP20(**)
Total counter depending on version:
Electromechanical not resetable (
7 numbers
): 1 counting unit = 1Kg/Smc (see Setup)
Electronic not resetable (
10 numbers
):
1 counting unit = 1Kg/Smc (see Setup)
Computing Head CPU Dimensions:
(230 x 154 x 66)mm
Computing Head CPU Weight:
1950g
Computing Head Display Dimensions:
(225 x 250 x 50)mm
Computing Head Display Weight:
960g
(*)
Outputs device depending:
Relays for TW1-
M “Standard”, or Solid State relays for TW1nA-M “ATEX”.
(**)
The declared protection degree is referred to the metallic box. The devices enclosed by
the dotted line in
Figure 1
must be installed in a cabinet with at least protection degree IP54,
compliant to standard EN60079-15 of
ATEX directive.
