TESTO 6721 User manual

Instruction manual en
testo 6721 Dew point monitor
P2A software for testo 6721

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Contents
Contents 3
Safety and the environment 4
Part 1: testo 6721
Specifications 5
Commissioning 8
Assembling the instrument 8
Wiring the instrument 9
Connecting the instrument 11
Parameterizing/adjusting/analyzing the instrument 11
Maintaining the product 11
Tips and assistance 12
Part 2: testo P2A Software
Specifications 13
First steps 14
Installing the software/driver 14
Starting the software 14
Product description 15
Using the product 16
Tips and assistance 19
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Contents 3
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4Safety and the environment
Safety and the environment
About this document
Please read this documentation through carefully and familiarize yourself with
the product before putting it to use. Keep this documentation to hand so
that you can refer to it when necessary. Hand this documentation on to any
subsequent users of the product.
Pay particular attention to information emphasized by the following symbols:
· Important.
Avoiding personal injury/damage to equipment
Never store the product together with solvents and do not use any
desiccants.
Only operate the product properly, for its intended purpose and within the
parameters specified in the technical data. Do not use force.
Only carry out the maintenance and repair work that is described in the
documentation. Follow the prescribed steps when doing so. Use only OEM
spare parts from Testo.
Protecting the environment
Send the product back to Testo at the end of its useful life. We will ensure
that it is disposed of in an environmentally friendly manner.

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testo 6721 - Specifications
PART 1: TESTO 6721
Specifications
Functions and use
The 6721 is a dew point monitor for monitoring trace humidity in the following
applications:
· Trace humidity monitoring in compressed air systems, e.g. upstream of pneumatic
machines.
· Monitoring (compressed air) low-temperature driers.
· Monitoring (compressed air) membrane driers.
The product must only be assembled, wired and connected by qualified
personnel.
The product must not be used in areas at risk of explosion!
Ordering overview
0555 6721 Axx / Fxx / Kxx
A01 G½" process connection
A02 NPT ½" process connection
B01 Measuring range -30 to +30°Ctd
B02 Measuring range -45 to +30°Ctd
F01 Dew point °Ctd / GW 1 / GW 2 / hysteresis
F02 Dew point °Ftd / GW 1 / GW 2 / hysteresis

6testo 6721 - Specifications
Technical details
Dimensions:
➊0555 6721-A01: G½
0555 6721-A02: NPT½"
➋Installation depth in process
➌Wrench size
33
176
167
33
21ø
7
2
56 ➋
92
42
➊
➌
Parameters, measuring range
· Dew point temperature (trace humidity):
-30 to 30 °Ctd/-22 to 86 °Ftd (B01) | -45 to +30°Ctd/
-49 to +86°Ftd (B02)
Accuracy
· Dew point temperature at 25 °C/77 °F process
temperature:
±4 K (-30…-20°Ctd/-22…-4°Ftd),
±3 K (-20…-10°Ctd/-4…14°Ftd),
±2 K (-10…0°Ctd/14…32°Ftd),
±1 K (>0°Ctd/>32°Ftd)
Resolution
· 0.1 °Ctd/0.1 °Ftd
Meas. cycle
·1/s
Other instrument data
· Humidity sensor: Testo humidity sensor (with special
trace humidity adjustment)
· Temperature sensor: NTC
· Output variable: Dew point (°Ctd or °Ftd) via two
switching outputs
· Measuring medium: Compressed air (filtered and
dried, ISO 8573 classes 2-4-2)
· Operating temperature: 0 - 50 °C/32 -122 °F, ideally
between 10 °C and 35 °C/50 °F
· Pressure range: max. 50 bar (abs)
· Connection: G½" (0555 6721-A01) or NPT½"
(0555 6721-A02)
· Supply: 24 V AC/V DC (20 - 30 V AC/V DC permissible)
· Power consumption: 50 mA
· Interfaces: mini-DIN interface for
parameterizing/adjusting/analyzing using testo
P2A Software
· Switching outputs: 2 x floating, switching voltage
24 V DC/V AC, switching current 0.5 A, optional wiring
as NC or NO contact
· Limit values (2x) and switching hysteresis (1x):
Free choice within the measuring range by means of
order code, or setting via testo P2A Software
· Sensor protection: Sintered stainless steel filter,
12 mm diameter
· Housing material: plastic PAA GF30
· Housing dimensions: 167 x 33 x 33 mm
· Protection class: IP65 (with adapter connected or with
protective tab on closed interface.)
· Ambient temperature: 0 to 50 °C/32 to 122 °F
· Storage temperature: -40 to 70 °C/-40 to158 °F
· Weight: 240 g
Directives, standards and tests
· EC Directive: 2014/30/EC
Warranty
· Duration: 2 years
· Warranty conditions: see website
www.testo.com/warranty

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testo 6721 - Product description
Product description
At a glance
➊Sensor protection: Sintered stainless steel cap.
➋Fixing the sensor assembly: Threaded pin.
➌Screwed socket: G ½ (0555 6721-A01) or NPT ½" (0555 6721-A02).
➍Fixing the housing cover: 2 countersunk screws.
➎Connector socket for switching contact connector.
➏Connector socket for external interface (mini-DIN Testo), plug.
Factory settings
Characteristic 0555 6721-F01 0555 6721-F02
Unit °Ctd °Ftd
Limit value for switching output 1 5 45
Limit value for switching output 2 10 55
Hysteresis 1 2

8testo 6721 - Commissioning
Commissioning
Assembling the instrument
➣Assembling the instrument at the process connection:
✓If assembling without a measurement chamber: The sections of pipe
where the instrument is assembled are depressurized.
1To ensure leaktightness: Wrap the thread of the screwed socket using
sealing tape (e. g. PTFE) or insert a copper sealing ring (internal diameter
of 21 mm).
2Assemble the instrument according to the application in hand:
Applications/assembly options
AProcess temperatures < 15 °C or > 35 °C (max. 200 °C):
Assembly with measurement chamber and cooling coil.
BProcess temperatures of 15 - 35 °C, quick assembly/dismantling of instrument is required, sufficient
incident flow through sensor (1l/min) not present:
Assembly with measurement chamber.
If media are contaminated: use suitable pre-filter.
CProcess temperatures of 15 - 35 °C, installation of sensor directly in the process is possible, quick
assembly/dismantling of instrument is not required, sufficient incident flow through sensor (1l/min)
present, compressed air is not contaminated:
Assembly without measurement chamber and without cooling coil
C
C
B
A
A
0555 6721-A01
0555 6721-A02
G 1/2
NPT 1/2"
G 1/2
NPT 1/2"
➊➋
➏
➎➍
➌

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testo 6721 - Commissioning
➊Process connection, quick-release compressed-air fastener NW 7.2 or G 1/2" or
NPT 1/2" thread
➋Cooling coil
➌Preliminary filter
When using the preliminary filter, it must be ensured that there is
sufficient flow (1 l/min) in the measurement chamber by cleaning the
filter regularly.
➍Measurement chamber (0554 3303).
➎testo 6721 dew point monitor.
➏Assembling the measurement chamber on the dew point monitor.
Only apply force at the hexagon (AF 27)!
Wiring the instrument
The testo 6721 is supplied with the right connector to which a cable can be
soldered by the customer. Alternatively, the 5 m accessories cable with the
pre-fabricated connector (0554 6720) can be used.
➣Fabrication of connection cable by the customer:
Testo recommends an 8-wire line with a tightly plaited shield, wire cross-
section of 0.25 - 0.5 mm².
1Remove top part of connector ➊from bottom
part of connector ➋(screw cap).
2Open line fixture on top part of connector
(screw cap/union nut ➌) and feed through
lines of connecting cable.

10 testo 6721 - Commissioning
3Solder ends of lines to the pins in the bottom
part of the connector ➍:
Two separate switching points can be created
using the two switching contacts which can
each be configured as either a NC contact
(1-3, 9-5) or NO contact (1-2, 9-6) ➎.
Assignment of the pins
1Root/pin for switching contact 1
2NO contact for switching contact 1
3NC contact for switching contact 1
4Supply -
5NC contact for switching contact 2
6NO contact for switching contact 2
7Functional earth
8Supply +
9Root/pin for switching contact 2
4Fasten top part of connector to bottom part
of connector (screw cap) and close line fixture
(screw cap/union nut).
➣Feeding wiring through with accessories cable 0554 6720:
Shorten length of line (5 m) if necessary.
Connect the ends of the line according to the colour assignment:
Two separate switching points can be created using the two switching
contacts which can each be configured as either a NC contact (grey-pink,
brown-green) or NO contact (grey-yellow, brown-white).
Colour Assignment
grey root/pin for switching contact 1
yellow NO contact for switching contact 1
pink NC contact for switching contact 1
red supply +
green NC contact for switching contact 2
white NO contact for switching contact 2
black Functional earth
blue supply -
brown root/pin for switching contact 2