Luwa HTT-V Series User manual

Operating Instruction Q5.25.45
TLT Page 1 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
Humidity and Temperature Transmitter HTT-V

Operating Instruction Q5.25.45
TLT Page 2 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
Table of contents
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OM MP PO ON NE EN NT TS S . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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1. .1 1H Hu um mi id di it ty y a an nd d t te em mp pe er ra at tu ur re e t tr ra an ns sm mi it tt te er r
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2. .1 1S Sc co op pe e o of f d de el li iv ve er ry y
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2. .2 2T Tr ra an ns sm mi it tt te er r F Fe ea at tu ur re es s . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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2. .3 3F Fa ac ct to or ry y S Se et tt ti in ng gs s . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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2. .4 4T Te ec ch hn ni ic ca al l s sp pe ec ci if fi ic ca at ti io on ns s . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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2. .5 5 D Di im me en ns si io on ns s
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NS ST TA AL LL LA AT TI IO ON N . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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OU UN NT TI IN NG G . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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5. .1 1O Ou ut ts si id de e m me ea as su ur re em me en nt t . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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TA AR RT TU UP P . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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ON NF FI IG GU UR RA AT TI IO ON N . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .1 1W Wo or rk ki in ng g p pr ri in nc ci ip pl le e . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .2 2O Ou ut tp pu ut t s si ig gn na al l s se el le ec ct ti io on n . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .3 3M Me ea as su ur re em me en nt t m mo od de e: :
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7. .4 4C Ca al li ib br ra at ti io on n H HR R: : . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .5 5C Ca al li ib br ra at ti io on n t te em mp pe er ra at tu ur re e: : . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .6 6A An na al lo og gu ue e O Ou ut tp pu ut ts s: : . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .7 7T Te em mp pe er ra at tu ur re e U Un ni it t: :
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7. .8 8L Lo ow w- -p pa as ss sf fi il lt te er r s se et tt ti in ng g : : . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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7. .9 9M Ma an nu ua al l o ov ve er rr ri id de e: :
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7. .1 10 0P Pa as ss sw wo or rd d p pr ro ot te ec ct ti io on n: : . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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EC CH HN NI IC CA AL L S SU UP PP PO OR RT T . .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .
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Operating Instruction Q5.25.45
TLT Page 3 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
1
1 C C
O
OM MP PO ON NE EN NT TS S
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1. .1 1
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Hu um mi id di it ty y a an nd d t te em mp pe er ra at tu ur re e t tr ra an ns sm mi it tt te er r
AN 28896
Humidity / temperature transmitter type DigiControl
HTT-V S room, with 24 VAC/VDC power supply, with
LCD display, with standard polyformaldehyde (POM)
probe length 90 mm.
AN 28897 AN 29164
Humidity / temperature transmitter type DigiControl
HTT-V M1, with 24 VAC/VDC power supply, with LCD
display,
with remote stainless steel probe length 250 mm,
on 3m wire.
Humidity / temperature transmitter type DigiControl
HTT-V M2, with 24 VAC/VDC power supply, with LCD
display,
with remote stainless steel probe length 250 mm,
on 10m wire.

Operating Instruction Q5.25.45
TLT Page 4 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
1
1. .2 2
A
Ac cc ce es ss so or ri ie es s a an nd d s sp pa ar re e p pa ar rt ts s
AN 28928 AN 28929
Sal_SC humidity set 58% 75% Sal_SC humidity 90%
AN 29025 AN 28904
Sal_SC humidity 33% Probe assembly bracket for duct 13mm
AN 28905 AN 28916
Probe-wall-mounting bracket 13mm (2 pieces) Connector set for HTT-V “S“ and “M“ 3 pieces
AN 28914 AN 28920 AN 28920
Power supply module 24 VAC/DC Special screw set for cover Screw set bottom

Operating Instruction Q5.25.45
TLT Page 5 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
AN 28902 AN 29121
Stainless steel probe duct HTT-V M1, length of cable
3 m
To use with high humidity (> 85%)
Stainless steel probe duct HTT-V M2, length of cable
10 m
To use with high humidity (> 85%)
AN 28901 AN 28907
Probe room HTT-V “S“ Electronics Module Transmitter HTT-V “S“ room
AN 28926 AN 28909
Electronics Module Transmitter HTT-V “M“ ext. Housing bottom complete
AN 28911 AN 28910
Housing cover HTT-V “M“ without electronics Housing cover HTT-V “S“ without electronics

Operating Instruction Q5.25.45
TLT Page 6 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
2
2 P P
R
RO OD DU UC CT T D DE ES SC CR RI IP PT TI IO ON N
The Luwa HTT-V, Stransmitter is a rugged precision measuring instrument for the use in HVAC control and regu-
lating systems. It continuously measures up to three times per second, the relative humidity and the actual air
temperature and shows the measured value on a large LCD display and simultaneously on two high-precision
analogue outputs.
Special features:
• Large LCD for a simultaneous display of %RH and temperature
• Easy and intuitive menu navigation (3 keys)
• 2 analogue outputs for measured value %RH und temperature (U or I), freely scalable
• Possibility of adjustment von %HR and temperature (3 points %HR / 1 point temperature)
• Average value display (1/4: 1 : 3 h display for 3 seconds)
• Password protection for all settings
• Changeover of Aout U / I and the display °C/°F
• Permanent online monitoring of all functions
Luwa HTT-V-M Luwa HTT-V-S
2
2. .1 1
S
Sc co op pe e o of f d de el li iv ve er ry y
The HTT-V S/M contains:
• RH/T measuring instrument including probe in room – duct version
• Stain relief plate including screw set and 4 spacers
• Instruction manual
• Assembly instructions
Check the completeness of the box contents.
Incomplete deliveries can be completed immediately by the Luwa Air Engineering AG representation.

Operating Instruction Q5.25.45
TLT Page 7 / 18
Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
2
2. .2 2
T
Tr ra an ns sm mi it tt te er r F Fe ea at tu ur re es s
Type HTT-V room HTT-V duct
Item number 28896 28897
Supply voltage 24 VDC +/-25%
(no galvanic isolation of input and output)
Power consumption min 20mA typical 50 mA max. 80 mA
(current outputs)
Measuring range -20…+80°C 0…100.0% RH
Application range 0…50°C
(Electronic) -20…80°C (Sensor)
Breathing air measurement
(MAC value respected)
Humidity / Temperature probe Digital capacitive humidity and temperature measuring system
Standard measurement accuracy +/- 0.4°C
(at 25°C) +/- 1.2°C (0…50°C)
+/- 2.5 - 3.0% RH
(20…80-90% RH) +/- 5.0% RH (0…100% RH)
Option measurement accuracy +/- 0.2°C
(at 25°C) +/- 1.0°C (0…50°C)
(with 3 points RH / 1 point T factory ad-
justment) +/- 1.5% RH
(10…90% RH) +/- 4.0% RH (0…100% RH)
Measurement hysteresis temperature /
humidity +/- 0.1°C +/- 1.0% RH
Measurement interval 330…500 ms
Temperature effect on measurement typical 0.06% RH /°C
Resolution of analog outputs typical 5 mV : 5uA
Accuracy of analog outputs typical 0.05% FS
(of the entire measuring range)
Housing protection class IP 54
Housing material POM
Probe protecting class IP 54
(with polymer membrane filter as option for type S, stand for type R and M)
Probe material Stainless steel / POM
Storage temperature range 5…+ 55°Cnoncondensing!
EMV-CE tests EN 61326-1 / EN 61326/A1 / EN 61010-1
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Fa ac ct to or ry y S Se et tt ti in ng gs s
Display: Temp. : -20…+80°C
Humidity : 0…100.0% RH
AOUT 1: Humidity : 0…10V. 0…20, 4…20mA / 0…100% RH
AOUT 2: Temp. : 0…10V, 0…20, 4…20mA / -20…+80°C
Password : "0000" -> deactivated
Factory adjustment : precalibrated (standard)
Opt. calibration : "CAL RH" L/M/H (3 PKT)
"CAL T" (1 PKT)
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Te ec ch hn ni ic ca al l s sp pe ec ci if fi ic ca at ti io on ns s
Power supply ......24 VAC / VDC ±25%
Output ..................2 x 4-20 mA
Max. Last: 500 Ohm (4-20 mA)
Galvanic separation...........................Output
Power consumption ..........................5 VA
CE-conformity (EMV).........................EN 61 326
Electrical connection.........................Screw terminals up to max. 1.5 mm²
Operating temperature
housing...............................................0 to +50°C
Probe...................................................-20 to +80°C
Storage temperature..........................5 to +55°C
Medium ...............................................air and neutral gases

Operating Instruction Q5.25.45
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Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
2
2. .5 5 D Di im me en ns si io on ns s
3
3 S S
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AF FE ET TY Y
This equipment has left the factory perfectly safety-related way.
Inappropriate manipulations or modifications are strictly forbidden. Follow all warnings and warning labels on
the instrument and in the manual.
The HTT-V is exclusively developed for the measurement in fresh air environments within the specifications.
Use and run this instrument only for this purpose. A different or additional use is considered as not intended.
The manufacture / supplier is not liable for possible damage caused. The risk is entirely assumed by the user.
The assembly and installation work shall only be done by certified personal (electrician or workman with
equivalent training).
The HTT-V may be operated only under the specified operating conditions.
Wherever malfunctions or errors can cause large material damage or personal injury, additional precautions
and external safety measures must be taken, so that in case of an error defined operating conditions are
guaranteed (for example limit switch).
The HTT-V is not suitable for the use in hazardous rooms.
The professional installation should comply with local electrical codes and with this manual.
The HTT-V contains ESD-sensitive components. Please refer to the appropriate safety measures.
Use only original accessories and spare parts from Luwa Air Engineering AG.
Without written permission from Luwa Air Engineering AG it is not allowed to carry out extensions or remodel-
ing at the HTT-V.
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NS ST TA AL LL LA AT TI IO ON N
General:
1. Read carefully the manual before the installation of the HTT-V instrument.
2. Verify the performance data on the label fixed on the instrument and check whether or not it is suitable for
your application.
3. Choose the appropriate mounting place according to the application and specification (possibly in cooperation
with the planners)
4. Observe strictly that the device specifications and the MAC values (maximum allowable concentration for the
chemical load for craftsmen) match.
5. Avoid that the instrument and the probe are exposed to a corrosive ambient air.

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Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
5
5 M M
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OU UN NT TI IN NG G
1. First remove the bottom of the instrument. If necessary, 4 holes can be broken through for the mounting on
the wall or at the ventilation duct. The breakthroughs should remain closed when assembling it at a ventilation
duct through cable flanges. This is the only way to guarantee the housing tightness
2. In case of unevenness of the mounting wall, 4 spacers can be assembled.
3. Insert the appropriate cables into the membrane which is at the bottom of the instrument by piercing small
holes into the membrane with a pointed scriber and then push the cables (only simple isolation) through the
holes.
4. Please use the stain relief plate for a cable stain relief.
5. After having set the dowels or drilled the appropriate holes in the wall, the bottom can be screwed.
6. Now you can screw the cables on the connector with the ferrule. Please consider for this the electric diagram
of the designer, respectively of the instrument.
7. Check the wiring carefully, before connecting the plugs to the cover plate with integrated electronics.
8. Introduce the cover plate into the upper bracket and click it laterally on the bottom. Check the correct fitting.
9. After switching on the supply voltage the HTT-V registers on the display.
EMC note:
1. Disturbing circuits of measurement or analysis units have to be separated by open ground.
2. Avoid, wherever possible, the parallel motion of measurement connections and power electric cables.
3. Shield the measurement connections, if necessary, and connect the screen only on one side with a defined
mass potential.
4. Twist the unshielded cables in pairs and keep them as short as possible.
Recommended cabling:
Supply: 24 VDC +/- 10% single-strands from 0.5...0.75 mm2 (22 ... 18 AWG) with PVC insulation or equivalent 2-
fold strand.
AOUT: 0...10 VDC / 0... 20 mA
Single-strand from 0.25...0.5 mm2 (24 ... 20 AWG) twisted and possibly shielded with PVC insulation or corre-
sponding 2/3/4-fold strand.

Operating Instruction Q5.25.45
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Draft created/changed: 31.01.03/TT Document created/changed: 03.08.2012 / Rea
Revision: - Revision: -
Draft released: 18.02.03/DEL Document released: 03.08.2012 / Rea
Jede unerlaubte Verwendung ist strafbar / Any unpermitted use is subject to prosecution.
5
5. .1 1
O
Ou ut ts si id de e m me ea as su ur re em me en nt t
For the outside measurements, use the same cables as for the duct measurements. The probe does not neces-
sarily have to be installed inside the duct, but can also be secured by means of a pipe clip to the outside wall of
the building. This application is used to detect the outside conditions, for example for the enthalpy. So that the
probe is not exposed to all weathers, a cover should be fitted over it.
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TA AR RT TU UP P
Before you start the system, check the correct supply wiring and the configuration of the analogue outputs (U/I
switch). Close the cover of the HTT-V before the power supply is switched on. Check the fuse protection on the
power supply in accordance with the current local regulations. Voltages above +35VDC lead to destruction of the
measuring instrument! The HTT-V is calibrated to a basic accuracy of +/- 2.5 - 3.0 % HR. (option +/- 1.5 % HR
with factory certificate). After switching-on the power supply, an automatic start-up occurs *S TST*. On the top
line of the display the current software version is shown for 2 seconds. After that the measurement starts immedi-
ately and the current relative humidity and temperature is displayed. In case of faults of the hard- or software, the
system alerts „ERROR” and shows an error-code. The device has an online monitoring, which reports error im-
mediately. The analogue outputs are protected against short circuit, but not protected against external supply.
Outside wall
Cover
Prob
e
Pipe Clip