TERZ 94
TERZ 94
TERZ 94
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max<br />
min<br />
24 VDC<br />
MESSTECHNIK GMBH<br />
Germany<br />
Further data:<br />
press button<br />
Current output 4-20mA yes no<br />
IP65<br />
4. Characteristics<br />
· Electronic totalizers<br />
(Main totalizer, additional start-stop or resettable<br />
totalizer for external totalizer disablement in order to<br />
suppress the slow-down effect of the turbine wheel<br />
after the gas flow has stopped.)<br />
· 2 sensor inputs (option)<br />
with mutual monitoring<br />
· Battery mode (version without a current board)<br />
Service life of the battery is a minimum of 6 years.<br />
· 4-20 mA current output (transmitter)<br />
(only with the version with a current board)<br />
· Low-torque metering system with long-term<br />
stability<br />
(apart from the turbine wheel, there are no<br />
mechanically actuated parts)<br />
· LF and HF pulse outputs<br />
(The pulse value of the LF pulse output is userprogrammable.)<br />
· Intrinsically safe circuit, approved for zone 1<br />
· Degree of protection: IP 65<br />
· Flow display<br />
· Storage of maximum values (Qm)<br />
· Temperature ranges (standard)<br />
Fluid temperature range: -10°C to +50°C<br />
Ambient temperature range: -20°C to +60°C<br />
· Compact construction with a rotatable meter head<br />
· Option for use as a remote totalizer<br />
· Alarm output (option)<br />
5. Approvals<br />
II 2 G EEx ib[ia] II C T4 / T3<br />
as per certificate of conformity No.: TÜV 02 ATEX 1970<br />
DVGW product ID No.: CE-0085BN0292<br />
(Testing in accordance with the Directive for Pressure<br />
Equipment 97/23/EG)<br />
6. Electronic totalizer<br />
Possible connections of the electronic totalizer:<br />
HF pulse output<br />
(high frequency)<br />
direct signal frequency<br />
LF pulse output<br />
(low frequency)<br />
decade-scaled<br />
Switch input<br />
for stopping the totalizer<br />
Transistor, open collector Transistor, open collector Switching contact<br />
(potential-free)<br />
4-20 mA current output<br />
Version with a current board<br />
(option)<br />
U max = 28 V (Ex)<br />
U max = 28 V (Ex)<br />
Totalizer stop:<br />
30 V (non Ex)<br />
30 V (non Ex) closed contact<br />
U max = 28 V<br />
U min = 4.0 V<br />
U min = 4.0 V<br />
U min = 12 V<br />
I max = 30 mA<br />
I max = 30 mA<br />
I max = 23 mA<br />
T pulse =1ms<br />
T pulse = 125 or 250 ms<br />
I min = 3.5 mA<br />
f max = 250 Hz<br />
f max =4Hz<br />
For frequency values, see<br />
table below Overview section<br />
For possible setting values,<br />
see table below Overview<br />
section<br />
Current loop connection<br />
(4-20 mA, 2-wire technology)<br />
Error less than 1% of the final<br />
value.<br />
External power supply unit<br />
required.<br />
Connection of the current output (example for installation in areas subject to explosion hazards)<br />
Volumeter<br />
Type <strong>TERZ</strong> <strong>94</strong><br />
- 0085<br />
DN<br />
Q<br />
Q<br />
PS<br />
Ser.-No.<br />
Year<br />
m³/h<br />
m³/h<br />
bar<br />
4-20 mA current output (option)<br />
LF HF<br />
pulse outputs<br />
Current<br />
loop<br />
24VDC<br />
EEx i supply unit<br />
KFD2-STC3-Ex 1<br />
Current<br />
output<br />
4-20 mA<br />
The <strong>TERZ</strong> <strong>94</strong> version with a current board has a<br />
current-loop connection (4-20 mA, 2-wire technology).<br />
A power supply unit and, if appropriate, a 24 V power<br />
pack are required to power the device and output a<br />
current.<br />
In addition, a back-up battery can be provided as an<br />
emergency power supply.<br />
Hazardous area<br />
Safe area
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