Scaleterminal

WT158

suitable for monting in hazardous area

TÜV 01 ATEX 1742
+ Scalable weight indicator in hazardous

area, Ex- Protection: II 2 G, E Ex ib IIC T4

+ Connect directly up to 4 weight cells (sum
resistance bigger than 85 Ω ) in hazardous
area
+ 5-digit 7- Segment display, 30 mm figure
height

+ Aluminium housing protection class IP65
+ digital EEx i open collector output

+ Optional signal transfer via 0/4 ..20 mA or
TTY interface
Description

The sacle terminal WT158 is a low cost indicator of
a scale in hazardous area. It has a signal input for a
weight cell a 5 digit 7 segment display and 4 keys.
The the housing protection class of the WT158
against dust and humidity is IP65.
The front keys allow a direct net / gross / Tare
switching as well as change of the weight dimension.
The device can be configured and scaled by buttons
and display.

Optional the WT158 has a TTY interface or an
analogous 0/4 .. 20 mA output to transmit the weight
data. The digital EEx i open collector output can be
used for scale limit monitoring. If the scale exceeds
the maximum (or the minimum) limit the output will
change its state. It is possible to choose normal open
or normal closed condition.

Technical Details
E x- p ro te c tio n

E E x ib IIC T 4

E C - typ e e xa m in a tio n c .

T Ü V 01 A TEX 1742

M o u n tin g

H a z a rd o u s a re a , Z o n e 1

D e v ic e g ro u p

A m b ie n t te m p e ra tu re

D im e n s io n s H x B x T
M a te ria l

p ro te c tio n

P o w e r s u p p ly : te . 1 ,2

II 2 G

-2 0 °C ...+ 5 0 °C T 4

160 m m x 100 m m x 63 m m
A lu m in iu m
IP 6 5

U = 10 V , I = 20 m A +
1 0 V / re s is ta n c e w e ig h t c e ll(s )

E E x i E le c tric a l
lim its

U i = 3 0 V , Ii = 1 1 0 m A , P i = 2 W ,
C i a n d I i a re n e g lig ib le

D ig ita l o u tp u t: te . 5 ,6

P a s s ive , v o lta g e d ro p a p p . 2 V

A n a lo g o u s o u tp u t:
te . 3 ,4

W e ig h t c e ll te rm in a l
fu rth e r lim its
S a m p le ra te
P re c is io n

T e m p e ra tu re c o e ffic ie n t

U 0 = U i a n K l.1 , I 0 = I i a t K l.1 , P 0
= P i (K l.1 ), C 0 = C 0 (K l.1 ) 3 0
n F , L 0 = L 0 (K l.1 ) 4 0 µ H
U i = 3 0 V , Ii = 1 6 0 m A ,
P i = 1 ,5 W , C i n e g lig ib le

U 0 = 5 ,9 V , I 0 = I i a n K l.1 , P 0 =
6 5 0 m W , C 0 = 2 µF , L 0 = L 0
(K l.1 ) 4 0 µH

s e e E C - ty p e e xa m in a tio n c ertific a te
0 ,0 3 %

0 ,0 1 5 %

8 Hz

VE

VE

a t 2 m V /V

each 10 K