Humidity transmitter for critical climate applications

We measure it.
Humidity transmitter for critical
climate applications
testo 6651
Optimum adjustment concept thanks to adjustability of the
entire signal chain incl. analog adjustment
Ethernet, relay and analog outputs allow optimum
integration into individual automation systems
Self-monitoring and early warning guarantee high system
availability
Calculation and presentation of the humidity parameters
%RH
relative humidity absolute humidity and dewpoint.
P2A software for parameterization, adjustment and analysis
°C
saves time and costs in commissioning and maintenance
Display with multi-language display
High-quality plastic housing
Not all measurement problems can be solved with „simple“
transmitters. The testo 6651 meets special challenges.
When combined with the probe series testo 660x, the
testo 6651 becomes the first choice in demanding
air conditioning technology as well as in many other
applications.
www.testo.com
testo 6651 – Humidity transmitter for critical climate applications
We measure it.
Technical data testo 6651
Parameters
General technical data
Humidity
Design
Units
Relative humidity %RH , °Ctd, °Ftd, g/m³
Material
Meas. range
0 to 100 %RH
Dimensions
122 x 162 x 77 mm (without probe)
Weight
0.675 kg (without probe, without
Ethernet module)
Temperature
Units
Temperature in °C / °F
Meas. range
Dependent on probe (testo 660x)
Plastic
Display
Display
Optional: 2-line LCD with clear text line and
relay status display
Resolution
0.1 %RH / 0.01 °C/°F / 0.1 °Ctd/°Ftd / 1 g/m3
Inputs and outputs
Analog outputs
Quantity
2 channels
Output type
0/4 to 20 mA (2-wire/4-wire)
0 to 1/5/10 V (4-wire)
Installation
Measuring rate
1/s
Cable screw fitting
Galvanic isolation
Galvanic isolation of the output signals (2-wire
and 4-wire), isolation of supply from outputs
(4-wire)
Standard: PG screw fitting
Optional: M16 or M20 M plug connection or
optional: NPT 1/2 plug connection
Probe connection
Digital plug connection
Resolution
12 bit
Other features
Accuracy of the analog
outputs
0/4 to 20 mA / ±0.03 mA
0 to 1 V / ±1.5 mV
0 to 5 V / ±7.5 mV
0 to 10 V / ±15 mV
500 Ω at 24 VAC/DC
Protection class
IP65
EMC
2004/108/EG
Operation
Parameterization
Max. load
Further outputs
Ethernet
Relays
Other outputs
Optional: module can be fitted as
intermediary layer
Optional: 4 relays (free allocation to
measurement channels or as collective alarm
with operating menu/P2A software),
up to 250 V AC/DC / 3 A (NO/NC)
Mini DIN for Testo P2A parameterization
software
Power
Voltage supply
2-wire: 24 VDC ±10 %
4-wire: 20 to 30 VAC/DC
Current consumption
max. 300 mA
Four operating buttons for display /
P2A software
Operating conditions
Operating temperature
(with integrated relay)
-40 to +60 °C
Without
display
Operating temperature
-40 to +70 °C / -40 to +158 °F
Storage temperature
-40 to +80 °C / -40 to +176 °F
With
display
Operating temperature
0 to +50 °C / +32 to +122 °F
Storage temperature
-40 to +80 °C / -40 to +176 °F
Measurement medium
Air, nitrogen
testo 6651 – Humidity transmitter for critical climate applications
We measure it.
Technical data probe series testo 660x
testo 6601
testo 6602
testo 6603
testo 6604
testo 6605
Type
Wall
Duct
Duct
Cable
Cable
Operating range
Room climate probe
wall mounting
Climate probe duct
mounting
Process climate
probe duct mounting
for higher process
temperatures
Climate probe with
cable
Stainless steel
process probe with
cable for higher
process temperatures
Measurement parameters
Humidity
Meas. range***
0 to 100 %RH
Measurement uncertainty*
(+25 °C)**
±(1.7 + 0.007 * mv) %RH (0 to 90 %RH) / ±(1.9 + 0.007 * mv) %RH (90 to 100 %RH)
+0.02 %RH per Kelvin dependent on the process and electronics temperature (for a deviation of 25 °C / 77 °F)
Selectable units
%RH; °Ctd/°Ftd
Reproduceability
better than ±0.2 %RH
Sensor
Testo capacitive humidity
sensor, plug-in
Testo capacitive humidity Testo capacitive humidity
sensor, plug-in
sensor, plug-in
Testo capacitive
humidity sensor, plug-in
Testo capacitive humidity sensor;
soldered
t90 max. 10 sec.
Response time (without
protective filter)
Temperature
Selectable units
°C/°F
-20 to +70 °C/
-4 to +158 °F
Sensor
Measurement
uncertainty*
(at +25 °C / +77 °F)
-30 ... +120 °C/
-22 ... +248 °F
-20 ... +70°C/
-4 ... +158 °F
±0.15 °C / 0.27 °F (PT1000 Class A)
-30 ... +120 °C/
-22 ... +248 °F
Pt1000 Class AA
General technical data
Probe shaft
Plastic ABS
Cable
Plug
Plastic ABS
Probe dimensions
(diameter)
Probe dimensions
(probe shaft length)
Cable length
Stainless steel
FEP coated
12 mm
70/200 mm
280 mm
140/280 mm
200/500 mm
–
specially for duct versions
1/2m
1/2/5m
Operating conditions
Pressure tightness
without
1 bar positive pressure (probe tip)
* Other accuracies apply for wall probe length 70 mm combined with a
current output (P07):
Operation: 2 channels at 12 mA, without display illumination, relay
off, additional measurement error to above values at +25 °C (+77°F),
humidity ± 2.5 % RH
**The determination of measurement uncertainty takes place
according to GUM (Guide to the Expression of Uncertainty in
Measurement):
For the determination of measurement uncertainty, the accuracy of
the measuring instrument (hysteresis, linearity, reproduceability), the
uncertainty contribution of the test site as well as the uncertainty of
the adjustment site (works calibration) are taken into account. For this
purpose, the value of k=2 of the extension factor, which is usual in
measurement technology is used as a basis, which corresponds to a
trust level of 95%.
PN 10 (probe tip)
PN 1 (probe tip)
***For continuous applications in high humidity (>80 %RH at ≤30 °C for
>12 h, >60 %RH at >30 °C for >12h), please contact us via www.testo.
com.
testo 6651 – Humidity transmitter for critical climate applications
We measure it.
162
Transmitter
testo 6651
Transmitter
testo 6651
Wall probe
testo 6601
Transmitter
testo 6651
Cable probe
testo 6604/6605
L = Probe length
L–A = Probe length – length protective cal
A = 35 mm
Duct probe
testo 6602/6603
b
122
77
a
Technical drawings
testo 6651 – Humidity transmitter for critical climate applications
Connection plan
Connection plan 2-wire technology
(4 to 20 mA)
18–24
VDC
2 channels
4 to 20 mA,
max. load
500 Ω
(at 24 V)
0V
Connection plan 4-wire technology
(0 to 20 mA / 4 to 20 mA / 0 to 1 V / 0 to 5 V / 0 to 10 V)
24V
+
-
CH1
+
-
CH2
+
-
CH3
+
-
20–30 V
AC/CD
+
-
0V
2 channels
0 to 20 mA / 4 to 20 mA,
max. load 500 Ω each,
0 to 1 V / 0 to 5 V / 0 to 10 V
We measure it.
testo 6651 – Humidity transmitter for critical climate applications
We measure it.
Options / Ordering example
The following options can be specified for the testo 6651:
Bxx Analog output / supply
Cxx Display / menu language
Dxx Cable entry
ExxEthernet
Fxx Humidity / temperature unit
channel 1
Gxx Humidity / temperature unit
channel 2
HxxRelay
Bxx Analog output/supply
B01 4 to 20 mA (2-wire, 24 VDC), not possible
with relay or Ethernet module
B02 0 to 1 V (4-wire, 24 VAC/DC)
B03 0 to 5 V (4-wire, 24 VAC/DC)
B04 0 to 10 V (4-wire, 24 VAC/DC)
B05 0 to 20 mA (4-wire, 24 VAC/DC)
B06 0 to 20 mA (4-wire, 24 VAC/DC)
Cxx Display / menu language
C00 without display / without operating menu
C02 with display and operating menu /
English
C03 with display and operating menu /
German
C04 with display and operating menu / French
C05 with display and operating menu /
Spanish
C06 with display and operating menu / Italian
C07 with display and operating menu /
Japanese
C08 with display and operating menu /
Swedish
C02–C08: Clear text language. Operating menu
only available with display.
* The standard scaling is supplied if „min“ and
„max“ are not specified.
** Plug connection M12, 5-pin plug and socket
available as accessories.
*** not with code „B01“.
Relay parameterization in commissioning via
oparating menu (display) or P2A software
Dxx Cable entry
D01 Cable entry M16 (relay: M20)
D02 Cable entry NPT ½’’
D03 Cable contact via M plug connection for
signal and supply (for optionale relay:
M20 cable entry)
ExxEthernet
E00 Without Ethernet module
E01 With Ethernet module
Ordering example
Order code for transmitter testo 6651
with the following options:
- 4 to 20 mA (2-wire)
- Cable entry M16/M20
- Factory configuration channel 1:
- %RH with scaling min 0 %, max
100 %
Fxx Humidity/temperature unit Channel 1*
- Factory configuration channel 2:
F01 %RH / min / max
F02 °C / min / max
F03 °F / min / max
F04°Ctd / min / max
F05°Ftd / min / max
F08g/m3
- °C with scaling min -10 °C/-14 °F,
Gxx Humidity/temperature unit Channel 2*
G01 %RH / min / max
G02 °C / min / max
G03 °F / min / max
G04°Ctd / min / max
G05°Ftd / min / max
HxxRelay
H00 Without relay***
H01 4 relay outputs, limit value monitoring***
H02 4 relay outputs, limit values Channel 1 +
collective alarm***
- max +70 °C/+158 °F*
- without relay
0555 6651 A01 B01 C03 D01 E00 F01
0 100 G02 -10 70 H00
testo 6651 – Humidity transmitter for critical climate applications
Options / Ordering example
The following options can be specified for the probe testo 660x
Ordering example
Lxx Probe version
Mxx Protective cap
Order code for testo 6602 with the
following options:
- Duct probe
(-20 to +70 °C/-4 to 158 °F sufficient)
Nxx Probe shaft length
Pxx Probe length / length mm
- Sintered stainless steel probe
- Probe length 280 mm
Lxx Probe version
L01
L02
L03
L04
L05
Probe
Probe
Probe
Probe
Probe
6601
6602
6603
6604
6605
(Wall version)
(Duct version -20
(Duct version -30
(Duct version -20
(Duct version -30
to
to
to
to
70 °C)
120 °C)
70 °C)
120 °C)
Mxx Protective cap
M01 Stainless steel protective cap
M02 Wire mesh protective filter
M03 PTFE protective cap
M04 Metal protective cap, open
M05 ABS plastic protective cap, open
Nxx Probe length / length mm
N00
N01
N02
N05
N10
N23
Without cable (for probe 6601)
Probe length 1 m (for probe 6604/6605)
Probe length 2 m (for probe 6604/6605)
Probe length 5 m (for probe 6605 only)
Probe length 10 m (for probe 6604/6605)
Probe length 0.6 m, especially for duct
versions (for probes 6602/6603)
Pxx Probe length / length mm
P07
P14
P20
P28
P50
Probe
Probe
Probe
Probe
Probe
length
length
length
length
length
70 mm (only for L01)
140 mm (only for L04)
200 mm (only for L01, L05)
280 mm (only for L01, L05)
500 mm (only L05)
0555 6600 L02 M01 N23 P28
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0981 8234/msp/I/01.2015
We measure it.
Subject to change without notice.
testo 6651 – Humidity transmitter for critical climate applications
www.testo.com

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