testo 6740 dewpoint transmitter to -45 °c · testo 6781 the transmitter testo 6781 was developed...
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Dewpoint transmitter to -45 °Ctd
SPECIFICATIONStesto 6740
SPECIFICATIONStesto 6740
testo 6740
The testo 6740 was especilally developed for tracehumidity measurement in compressed or dry air (e.g. granulate dryers). Thanks to a special adjustment,optimum accuracy in the trace humidity range hasbeen achieved. The result of the development of thetesto 6740 is a measuring range of -45 °Ctd to+30 °Ctd and excellent accuracy.
For the display of the relevant trace humidityparameters, a freely scalable analog output isavailable, optionally with a switch contact plug forMAX monitoring. In addition to this, the testo 6740stands out thanks to its compact and user-friendlydesign, such as the rotatability of the housing by350° for the optimum positioning of the display.
Areas of application:
• Refrigeration dryers
• Membrane dryerser
• Adsorption dryers
• Granulate dryers
• Measurement of dewpoints in the range from-45 °Ctd to +30 °Ctd
• Testo polymer humidity sensor with high accuracyand long-term stability
• Convenient operation via the display menu
• Analog output 4 to 20 mA (2-wire) and optionalalarm plug with 2 integrated switch outputs
• Compact design with rotatable housing by 350° foroptimum positioning of display
• Display with operating menu (optional)
• Trace humidity adjustment without referencemeasuring instrumentpossible on site with accessory (2-pointadjustment device), replaces expensive adjustmentwith dewpoint mirror
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testo 6740
Subject to change without notice.
Dewpoint transmitter to -45 °Ctd
Technical data
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Supply
Analog outputs
Switch outputs (opt. alarm plug, 0554 3302)
Resolution 12 bit
Current/accuracy 4 to 20 mA (2-wire) / ±40 μA
load 10 V DC: max. 100 �,30 V DC: 950 �
Inputs and outputs
Measurement rate 2 s
Contacts 2 closer contacts, pot.-free, max.30V/0.05A
Voltage supply 24 V AC/V DC (10 to 30 V DCpermitted); with alarm plug (0554 3302)20 to 28 V DC
Display
Design
Installation
General technical data
Material/colour Plastic, polyacrylamide
Dimensions 199.5 x 37 x 37 mm(with standard plug)203.5 x 37 x 37 mm(with plug 0554 3302)
Display
Protection class IP65 (with plug attached and wireconnected
EMC According to guideline 89/336 EEC
Thread / processconnection
G½ thread (order code 01) or NPT½"thread (order code A 02)
Weight Approx. 300 g
High intensity 7-segement display
Operating temperature(housing)
-20 to +70 °C (+4 to +158 °F)
Operating conditions
Storage temperature -40 to +80 °C (-40 to +176 °F)
Dewpoint/trace humdity
Measurement parameters
Calculated parameters °Ctd, °Ftd, °CtA, °FtA, ppmv, mg/m3, °F
Units %RH, °C
Response time t90 �= 60 sec for change from 13.2°Ctd to -32.1 °Ctd
t90 �= 17sec for change from -32.2°Ctd to 13 °Ctd
Measurementuncertainty
±1 K at 0 °Ctd (+32 °Ftd)±3 K at -20 °Ctd (-4 °Ftd)±4 K at -40 °Ctd (-40 °Ftd)
Normed atmospheric dewpoint
Measuring range -70 to -15 °CtdA (-112 to -5 °FtdA) (at30 bar rel./ 435 psi)-54 to +10 °CtdA (-94 to +50 °FtdA) (at3 bar rel./43.5 psi)-45 to +30° CtdA (-76 to +86 °FtdA) (at0 bar rel./0 psi)
Sensor Polymer humidity sensor withprotocolized trace humidity adjustmentat -40 °Ctd (-40 °Ftd)
Miscellaneous
Process pressure max. 50 bar (725 psi)
Measuring range -45 °Ctd to +30 °Ctd
TemperatureMeasuring range 0 to 50 °C (32 to +122 °F)
Measurement uncertainty ±0,5K (0 to 50 °C/32 to 122 °F)
Sensor NTC
Scaling Freely scalable via display buttons
Switch thresholds Standard 6 °Ctd/12 °Ctd, freely progr.with display
Current consumption 21 mA (without alarm plug)65 mA (with alarm plug)
Resolution °C: 0.1RH: 0.1°Ctd: 0.1°Ftd: 0.1°CtA: 0.1°FtA: 0.1
Rotatability (displaypositioning)
350° around housisng axis
ppmv: 1 / 10 / 100(dep. on meas. value)mg/m3: 1 / 10 / 100(dep. on meas. value)°F: 0.1
We measure it.
testo 6740
Dewpoint transmitter to -45 °Ctd
Subject to change without notice. 0981
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Technical drawings
G½
or
NP
T½
SW
2737 Ø 1
2
Installation depthin process
33 40 108.5
181.5 10 34
38
56
38.9
51 71
176
Standard connection plug (4 to 20 mA – 2-wire)
Switch contact plug: cable connection plug forsupply/analog output (4 to 20 mA – 2-wire)
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testo 6740
Order data testo 6740
testo 6741, G½ thread, without display 0555 6741testo 6742, NPT½ thread, without display 0555 6742testo 6743, G½ thread, with display 0555 6743testo 6744, NPT½” thread, with display 0555 6744
Order no.Basic instrument (incl. plug for analog signal output)
Pin plugterminals
Relay boardterminals
U = 20 to28 V DC
US (main alarm)
LS (pre-alarm)
PE
4 to 20 mA
Supply
Dewpoint transmitter to -45 °Ctd
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Connection plan
With standard plug (included in delivery 0555 674x): With switch contact plug (0554 3302)
Pin plug terminals1: + (4 to 20 mA), Supply 12 to 30 VDC2: - (4 to 20 mA)3: Not used4: Measurement earth (cable shield)
Relais board wire (connected ex-works)
Shield on PE(protectionearth)
Pin plug terminals1: I + (4 to 20 mA)2: I - (4 to 20 mA)3: (connected with
relay board ex-works)
: Connect shield
Relay board terminals1: 20 to 28 V DC2: LS +3: LS -4: US +5: US -6: 0 V DC
Current signaland supply 20 to28 V DC
Pin plug
Rel
ay b
oard
Standard plug
This version provides a 4 to 20 mA analog output in 2-wire technology.
Switch contact plug (0554 3302)
4 to 20 mA, 2-wire as well as 2 potential-free switch contacts + 2 LED
Max. switching 0.5 A/30 V
4
1
+
The supply connections must be galvaicallyconnected, i. e. make connection - or - !
U = 10 ...4 to 20 mA
We measure it.
Dewpoint transmitter to -90 °Ctd
SPECIFICATIONStesto 6781
SPECIFICATIONStesto 6781
testo 6781
The transmitter testo 6781 was developed speciallyfor trace humidity measurement in compressed airand in dry air (e. g. in granulate dryers). Theinternational norm ISO 8573 categorizes sevenclasses of compressed air. High-performanceadsorption dryers are required in order to meet thehighest quality classes 1 and 2. They can bemonitored by the testo 6781 down to very lowdewpoints of -90 °Ctd.
The newly developed sensor with sol-gel technologyis characterized by its condensation-proofness andfast response time, thus guaranteeing highestprocess security.
Areas of application:
• Dewpoint measurement in compressed air in ISOClasses 1 (�-70 °Ctd) and 2 (�-40 °Ctd)
• Monitoring of adsorption dryers, granulate dryersand medical compressed air
• Quality assurance for noble gas preparation
• Measurement of dewpoints in the measuringrange -90 to -20 °Ctd
• New, very condensation-proof sensor with sol-geltechnology guarantees highest process securityand fast response
• Automatic self-adjustment ensures high accuracyand long reliability
• Optional display with multi-language user menu
• Self-monitoring of the transmitter guarantees highsystem availability
• The P2A software for parameterization,adjustment and analysis saves time and costs incommissioning and maintenance 0981
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testo 6781
Supply
Analog outputs
Other outputs
Resolution 12 bit
Load max. 500 �
Meas. cycle 1/sec
Inputs/outputs
Current/accuracy 0 to 20 mA ±0.03 mA (4-wire)4 to 20 mA ± 0.03 mA (4-wire)
Output type 0 to 1 V ±1.5 mV (4-wire)0 to 5 V ± 7.5 mV (4-wire)0 to 10 V ±15 mV (4-wire)
Digital Mini-DIN for P2A software
Voltage supply
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 themeasuring instrument (hysteresis, linearity, reproduceability), the uncertaintycontribution 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 ofthe extension factor, which is usual in measurement technology is used as abasis, which corresponds to a trust level of 95%.
This total view results in an additional dewpoint-dependent and process-dependent inaccuracy contribution of±0,03K x m.v.(in °Ctd) + 0.2 K x (25 °C - process temperature in °C).
Below -75 to -90°Ctd, an assymetrical measurement uncertainty of +8.5 K / -2.5K applies.
Display
Model
Miscellaneous
Display optional: 2-line LCD with multi-language operating menu
General technical data
Material Metal housing
Dimensions 208 x 60 x 35 mm
Weight 0.5 kg
Resolution
Protection class IP 65
EMC EU guideline 2004/108/EC
Measuring range Resolution
0 to +100 %RH 0.0010.001 to 28 g/kg 0.0010.01 to 194 g/lb 0.010 to 31 g/m3 0.0010.001 to 14 g/ft3 0.0010.1 to 9999 ppm(V) 0.1-90 to -20 °Ctd 0.1-130 to -4 °Ftd 0.1-90 to -20 °CtdA 0.1-130 to -4 °FtdA 0.1-40 to +70 °C 0.01-40 to +158 °F 0.01
Technical data
Subject to change without notice.
Dewpoint transmitter to -90 °Ctd
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Operation temperatureWithoutdisplay
With display
-40 to +70 °C / -40 to +158 °F
Storage temperature -40 to +80 °C / -40 to +176 °F
Operation temperature -20 to +70 °C / -4 to +158 °F
Storage temperature -20 to +70 °C / -4 to +158 °F
Process temperature -40 to +70 °C / -40 to +158 °F
Process pressure max. 50 bar
Operating conditionsOperating conditions
Humidity/trace humidity
Parameters
Measuring range -90 to -20 °Ctd / -130 to -4 °Ftd
Measurementuncertainty*
-20 °Ctd to -40 °Ctd: ±1,5K-40 °Ctd to -60 °Ctd: ±2K-60 °Ctd to -75 °Ctd: ±2,5K
Response time t63 ≤ 3s for switch from -75 °Ctd to -30°Ctd
t90 ≤ 9s for switch from -75 °Ctd to -30°Ctd
t63 ≤ 300s for switch from -30 °Ctd to -75 °Ctd
t90 ≤ 1080s for switch from -30 °Ctd to-75 °Ctd
Autom. self-adjustment Cycle adjustable: 1 h / 6 h / 12 h / 24 h / 48 h
Units °Ctd, °Ftd, %rF, %RH
Calculated variables °CtdA, °FtdA (normed atmosph. dewpoint),ppmV, g/m³, g/ft³, g/kg, g/lb
20 to 30 VAC/DC, 300 mA currentconsumption, galvanically separatesignal and supply linePlug connection: M12 5-pin plug**
** Suitable M12 socket available as accessory
We measure it.
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testo 6781
Dewpoint transmitter to -90 °Ctd
Subject to change without notice.
Technical drawings
Connection plan
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208 mm
59,5
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77 m
m35 m
m
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)
Plug connection M12 (5-pin), plug
Pin Connection
1
2
3
4
5
-24 V
+24 V
+Ch1
-Ch1
PE
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testo 6781
Dewpoint transmitter to -90 °Ctd
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The following options can be specified for the testo 6781:
AXX Process connection
BXX Analog display/supply
CXX Display / menu language
FXX Humidity parameter / min limit value / maxlimit value / hysteresis (pre-set)
MXX Protective cap
AXX Measuring range
A01 Process connection G1/2A02 Process connection NPT 1/2“
BXX Analog display/supply
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 4 to 20 mA (4-wire, 24 VAC/DC)*
CXX Display / menu language
C00 without displayC02 with display/EnglishC03 with display/GermanC04 with display/FrenchC05 with display/SpanishC06 with display/ItalianC07 with display/JapaneseC08 with display/Swedish
FXX Humidity parameter / min limit value / maxlimit value / hysteresis (pre-set)
F01 °Ctd / min / maxF02 °Ftd / min / maxF03 % RH/Min/MaxF04 %RH / min / maxF05 °Ctd A / min / maxF06 °Ftd A / min / maxF07 ppmV / min / maxF08 g/m³ / min / maxF09 g/ft³ / min / maxF10 g/kg / min / maxF11 g/lb / min / max
MXX Protective cap
M01 Stainless steel capM03 PTFE cap
Order code for transmitter testo 6781 withthe following options:
- Process connection NPT 1/2“- Analog display/supply 4 to 20 mA (4-wire,
24 VAC/DC)- without display- Humidity parameter / min limit value / max
limit value / hysteresis g/m³ / min / max- Sintered stainless steel cap
Example:
0555 6781 A02 B06 C00 F08 M01
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Dewpoint guard to -30 °Ctd
SPECIFICATIONStesto 6721
SPECIFICATIONStesto 6721
testo 6721
The testo 6721 is a budget dewpoint guard withswitch contacts.
Continuously monitoring a "simple" compressed airrefrigeration dryer was often not economically viablein the past. This security gap is now closed with thetesto 6721. Whether integrated into the refrigerationdryer or pneumatic machine, or retrofitted by thecustomer, the testo 6721 avoids damage caused byexcessive humidity in compressed air.
Areas of application:
Since the testo 6721 has only aswitch output, it isprimarily suited to monitoring limit values.measurement values cannot be output via an analogsignal. The budget monitoring function is particularlysuitable at machine level, in order to protect asystem, e. g. compressed air refrigeration dryers,from humidity damage. This avoids costly repairwork necessary by high humidity, leading to icing,corrosion, material adhesion, "water hammer"(mechanical damage due to accelerated waterdeposits), and much more.
• Measurement of dewpoints in themeasuring range -30 to +30 °Ctd
• 2 switch outputs as output for monitoring limitvalues
• long term stable and condenstation-proof Testohumidity sensor (polymer sensor) guaranteeshighest process security
• P2A software for parameterization, adjustment andanalysissaves time and costs in commissioningand maintenance
• Low-budget solution for monitoring refrigerationdryers
• Compact design allows easy integratiion into arefrigeration dryer or pneumatic machine
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We measure it.
testo 6721
Subject to change without notice.
Dewpoint guard to -30 °Ctd
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Power
Outputs
Further outputs
Measurement rate 1/s
Switch outputs 2 x potential-free, switch voltage 24VDC / VAC, switch current 0.5 A,optional wiring as NC contact or NOcontact
Resolution switch output 0.1 °Ctd or 0.1 °Ftd
Inputs and outputs
Hysteresis and limitvalues
Free selection within measurementrange through Order code, or set usingP2A software
Digital Mini DIN interface (serial) forparameterisation/adjustment/analysisthrough P2A software
Voltage supply 24 VAC / VDC (20 to 30 VAC / VDCmax.)
Technical data testo 6721
Current consumption
AC or DC
Design
Installation
General technical data
Material Plastic PAA GF30
Dimensions 167 x 33 x 33 mm
Protection class IP65
EMC In accordance with EU guideline89/336/EEC
Thread / process connection
G½ thread (Order code A01) or NPT½“thread (Order code A02)
Weight 240 g
Operating temperature(housing)
0 to +50 °C (32 to +122 °F)
Operating conditions
Storage temperature -40 to +70 °C (-40 to +158 °F)
Dewpoint/trace humidity
Parameters
Meas. range -30 to +30 °Ctd (-22 to +86 °Ftd)
Units °Ctd / °Ftd
Reaction time �= 1s
Measurement inaccuracy ±4 K > -30 °Ctd (-22 °Ftd)±3 K > -20 °Ctd (-4 °Ftd) ±2 K > -10 °Ctd (+14 °Ftd) ±1 K > 0 °Ctd (32 °Ftd)
Sensor protection Stainless steel sintered filter (12 mm)
Temperature
Sensor NTC
Sensor Testo humidity sensor with specialtrace humidity adjustment (polymersensor)
Outputs
2-wire current4 to 20mA
4-wire voltage
DC
DC
AC
Supplyvoltage [V]
Currnetconsumption [mA]
20 / 24 / 30 20 / 20 / 20
24 / 30 / 20 7 / 7 / 20
24 / 30 22 / 28
Other features
Measuring medium Compressed air (filtered and dried,ISO 8573-classes 2-4-2)
Process pressure max. 20 bar (abs.)
We measure it.
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testo 6721
Dewpoint guard to -30 °Ctd
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Technical drawings
Connection plan
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Pin allocation1 Root switch contact 12 Closer switch contact 13 Opener switch contact 14 Supply +5 Opener switch contact 26 Closer switch contact 27 Function earth8 Supply -9 Root switch contact 2
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testo 6721
Dewpoint guard to -30 °Ctd
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Subject to change without notice.
The following options can be specified for the testo 6721:
AXX Process connection
FXX Unit dewpoint / min. max. limit value /hysteresis (pre-setting)
AXX Process connection
A01 Process connection G½A02 Process connection NPT ½"
FXX Unit dewpoint / min. max. limit value /hysteresis (pre-setting)
F01 Dewpoint °Ctd / LV 1 / LV2 / hysteresisF02 Dewpoint °Ftd / LV 1 / LV2 / hysteresis
Order code for testo 6721 with thefollowing options:
- G½ thread- Dewpoint in °Ctd
- Lower limit value at 5 °Ctd
- Upper limit value at 14 °Ctd
- Hysteresis = 1 K
Example:
0555 6721 A01 F01 5 14 1
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Limit values: Without specification, default limit values are +5 °Ctd /+10 °Ctd, at 1 Kelvin hysteresis (for unit °F: 45 °Ftd / 55 °Ftd / 2 °Fhysteresis). They can be set to customer requirements with the helpof the Order code, cf. Order example.
We measure it.