Spirax Sarco DIVA User manual

IM-P337-18 MI Issue 4 1
DIVA
Saturated Steam Flowmeter
Installation and Maintenance Instructions
IM-P337-18
MI Issue 4
3378050/4
1. General
safety information
2. General
product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. pare parts
8. Fault finding
9. ettings table
Printed in the UK © Copyright 2005
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IM-P337-18 MI Issue 42
Your attention is drawn to the relevant Supplementary Safety Information sheet
supplied with the product as well as to any National or local regulations.
Safe operation of the product depends on it being properly installed, commissioned
and maintained by a qualified person in compliance with the operating instructions.
It is essential to comply with general installation and safety instructions for pipeline
and plant construction, as well as to make proper use of tools and safety equipment.
The product is designed and constructed to withstand the forces encountered
during normal use. Use of the product for any other purpose, or failure to install the
productinaccordancewiththeseInstallationandMaintenanceInstructions,couldcause
damage to the product, will invalidate the marking, and may cause injury or fatality
to personnel.
Warning
This product complies with the requirements of Electromagnetic Compatibility Directive
89/336/EEC by meeting the standards of:
EN 61326: 1997 Electrical equipment for measurement, control and laboratory use -
EMC requirements. Immunity to industrial locations annex A - Table A1.
Emissions to domestic locations Table 4.
The following conditions should be avoided as they may create interference above
the limits specified in EN 61326: 1997 if:
-The product or its wiring is located near a radio transmitter.
-Cellular telephones and mobile radios may cause interference if used within
approximately 1 metre (39") of the product or its wiring. The actual separation distance
necessary will vary according to the surroundings of the installation and the power
of the transmitter.
If this product is not used in the manner specified by this IMI, then the protection
provided may be impaired.
1. General safety information
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2. General product information
Fig. 1
This manual explains how to install, commission and maintain the Spirax Sarco Direct In-line
Variable Area (DIVA) flowmeter for use on saturated steam.
2.1 Product description
The Spirax Sarco DIVA flowmeter is designed to reduce the cost of flowmetering and is used
as an accurate means to measure saturated steam flowrates.
The DIVA is a stand alone device and requires no other equipment, such as differential pressure
transmitters, pressure sensors, etc. to calculate mass flowrates of saturated steam.
2.2 Equipment delivery and handling
Factory shipment
Prior to shipment, the Spirax Sarco DIVA is tested, calibrated and inspected to ensure proper
operation.
Receipt of shipment
Each carton should be inspected at the time of delivery for possible external damage. Any
visible damage should be recorded immediately on the carrier’s copy of the delivery slip.
Each carton should be unpacked carefully and its contents checked for damage.
If it is found that some items have been damaged or are missing, notify Spirax Sarco
immediately and provide full details. In addition, damage must be reported to the carrier with a
request for their on-site inspection of the damaged item and its shipping carton.
Storage
Ifa flowmeteris tobe storedfor aperiod priorto installation,the environmentalstorage conditions
shouldbe ata temperaturebetween 0°Cand70°C(32°F and158°F), andbetween 10%and 90%
relative humidity (non-condensing).
2.3 Sizes and pipe connections
DN50, DN80 and DN100
The DIVA is of a wafer design, suitable for fitting between the following flanges:
EN 1092 PN16, PN25 and PN40
BS 10 Table H
ANSI B 16.5 class 150 and 300
Japanese Industrial Standard JIS 20
Korean Standard KS 20.
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2.4 Pressure/temperature limits
Temperature °C
Pressure bar g
The product must not be used in this region.
The product should not be used in this region due to the limitations of the software.
PMA Maximum allowable pressure @ 239°C (460°F)Saturated steam 32 bar g (464 psi g)
otherwise as the specified flange rating
TMA Maximum allowable temperature 250°C (482°F)
Minimum allowable temperature 0°C (32°F)
PMO Maximum operating pressure Horizontal flow 32 bar g (464 psi g)
for saturated steam service Vertical flow 11 bar g (160 psi g)
Minimum operating pressure 0.6 bar g (8.7 psi g)
TMO Maximum operating temperature 239°C (460°F)
Minimum operating temperature 0°C (32°F)
Maximum electronics ambient temperature 55°C (130°F)
Maximum electronics humidity level 90% RH (non-condensing)
Maximum The pressure drop across the DIVA flowmeter at the maximum rated flow
DPMX differential is nominally 750 m bar (300 inches wg) for the DN50,
pressure and 500 m bar (200 inches wg) for the DN80 and DN100
Designed for a maximum cold hydraulic test pressure of 52 bar g (754 psi g)
2.5 Technical data
IP rating IP65 with correct cable glands.
Power supply Loop powered nominal 24 Vdc
Outputs 4-20 mA (proportional to mass flow)
Pulsed output Vmax 28 Vdc, Rmin 10 kW
Communication port EIA 232C
System uncertainty ±2% of reading over the range of 10% to
Performance to ISO 17025 100% of maximum rated flow
(95% confidence to 2 STD) ±0.2%FSD from2% to10%of maximum ratedflow
Turndown: up to 50:1
2.6 Electrical connections
Standard M20 x 1.5
Available to order ½" NPT
0
239
10 20 30 32 40
0 100 200 300 400 500
0
50
100
150
200
250
100
200
300
400
Pressure psi g
Temperature °F
Steam
saturation
curve
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IM-P337-18 MI Issue 4 5
Fig. 2
2.8 Dimensions/weights (approximate) in mm and kg
Size A B C D E Weight
DN50 35 103 265 155 145 3.35
DN80 45 138 285 150 145 5.25
DN100 60 162 315 205 145 8.20
A
D
B
C
E
2.7 Materials
Body Stainless steel S.316
Internals 431 S29/S303/S304/S316
Spring Inconel®X750 or equivalent
Stem Stainless steel 431 S29
Housing Aluminium HE30
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Note: Before actioning any installation observe the 'Safety information' in Section 1.
To meet its specified accuracy and performance it is essential that the following installation
guidelines are followed carefully. For steam applications sound steam engineering practices
should be followed, including the use of separators. The installation must conform to all
relevant construction and electrical codes.
3.1 Environmental conditions
The flowmeter should be located in an environment that minimises the effects of heat,
vibration,shockandelectricalinterference.(Pressure/temperaturelimitsaredetailedinSection2.4).
CAUTION: Do not lag the DIVA or mating flanges as this may result in excessive
temperatures in the electronics. Exceeding specified temperature limits will invalidate
the warranty and can adversely effect the performance and may damage the DIVA.
Other considerations
Be sure to allow sufficient clearance for:
-Installation of conduit/wiring. - Removal of the enclosure end caps.
-Viewing of the display. Note electronics housing and display can be rotated.
Warning: Do not install the flowmeter outdoors without additional weather protection to
prevent damage due to freezing.
3.2 Mechanical installation
Warning: Do not alter the adjustment nut at the back of the DIVAs shaft, as this will
affect the flowmeters calibration.
Orientation
The DIVA can be installed in any orientation when the pressure is below 11 bar g (160 psi g),
see Figures 3 and 4.
When the pressure is above 11 bar g the DIVA must be installed in a horizontal pipe, with the
electronics housing below the body, see Figure 4.
Ideallyinanyhorizontalorientation,theDIVAshouldbeinstalledwiththeelectronichousingbelow
the body. Where this is not possible, the DIVA can be installed with the electronics enclosure
above the body. However, the pressure of the saturated steam must be below 11 bar g (160 psi).
Note: The DIVA operates with flow in one direction only. It is not intended for use with
bi-directional flow. The DIVA is clearly marked with a direction of flow arrow.
Rotating the electronics enclosure
The electronics housing can be rotated 270°to enable sufficient clearance for installation. To
rotate the display loosen the grub screw immediately below the enclosure, rotate the enclosure
and tighten the grub screw. Warning: Do not untighten stem from the main body of the unit.
Upstream/downstream pipework
The DIVA flowmeter should be installed in pipework manufactured to BS 1600 or ANSI/ASME
B 36.10 Schedule 40, which corresponds to the following pipeline internal diameters.
Nominal diameter Nominal internal diameter
50 mm 52 mm
80 mm 77 mm
100 mm 102 mm
For different pipe standards/schedules, if the flowmeter is being operated at the extreme
of its published maximum range, and maximum accuracy is required, downstream spool
pieces manufactured from BS 1600 or ANSI/ASME B 36.10 Schedule 40 pipe should be used.
It is important that the internal upstream and downstream diameters of pipe are smooth. Ideally
seamless pipes should be used and there should be no intrusive weld beads on the internal
diameter. It is recommended that slip-on flanges be used to avoid any intrusive weld beads on
the internal diameter of the pipe.
Note: See pages 8 and 9, Figures 5 to 8 for other considerations which need to be noted
before determining the correct installation location.
3. Installation
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Note: The DIVA operates with flow in one direction only. It is not intended for use with
bi-directional flow. The DIVA is clearly marked with a direction of flow arrow.
Fig. 4 Horizontal flow up to 32 bar g
Fig. 3 Vertical flow up to 11 bar g
Electronics
housing
Electronics
housing
or
or
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Fig. 6
Fig. 5
12D Minimum 3D Minimum
6D Minimum 3D Minimum
Flow
Flow
The DIVA normally only requires a minimum of 6 pipe diameters upstream and 3 downstream
of clear straight pipe. These dimensions assume a measurement from a single 90° bend
(see Figure 5).
If any of the following configurations are present upstream of the DIVA:
-Two right angled bends in two planes.
-Pressure reducing valve.
-Partly open valve.
Then it is recommended that the minimum upstream clear pipework is doubled to 12 diameters
(See Figure 6).
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Fig. 7
Fig. 8
25D Minimum
3D Minimum
Spool piece
Flow
Flow
Avoid installing the DIVA flowmeter downstream of an actuated valve as rapid cycling of
the valve could give rise to inaccurate results or damage the flowmeter. See Figure 7. In
configurationswherethereismorethanonerapidactingpressurereducingvalveclosecoupled,
the DIVA flowmeter should be installed with a minimum of 25 upstream and 3 downstream pipe
diameters away from the valves.
Safety valves should also be as far away as possible from the flowmeter - at least 25D.
To install the DIVA pipeline unit into existing pipework and for aiding possible flowmeter
removal, it may be necessary to use a spool piece to ease installation (see Figure 8).
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Fig. 11 Gaskets and pipe offline, fitting incorrectly
Fig. 10 Gaskets fitted incorrectly
Fig. 9 Gaskets fitted correctly
37
7
Location in pipework
Bolt ring gaskets having the same internal diameter of the pipework are recommended. This
will prevent possible inaccuracies being created by the gasket protruding into the pipe.
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IM-P337-18 MI Issue 4 11
+
5
4
3
2
1
+
-
+
N
L
Fig. 13 Wiring diagram
DIVA
Flowmeter
Loop
Current
output
Pulse
Output
(Opto-
isolated)
M750 display unit
with 4 - 20 mA active input
(supplying current loop)
EIA 232 (RS232)
Communication port
(RJ11 socket)
Fuse
1 A
230 V
50 Hz
3.3 Electrical installation
The DIVA is a loop powered device. This Section describes loop wiring and shows typical
conductorterminations(TheEIA232C(RS232)wiringisdiscussedinSection4.11,page22).
It also considers the effect of connecting additional equipment (e.g. recorder, loop powered
display) to the loop.
Wiring the DIVA
The wiring terminals can be accessed by removing the end cap of the enclosure. A typical loop
wiring diagram is shown in Figure 13.
If an M750 display unit is purchased from Spirax Sarco for use with the DIVA, the M750
must be configured to the flow of the DIVA @ 20 mA. If the DIVA 4 - 20 mA output is rescaled
(see Section 4.6.1), it is important that the 20 mA input valve on the M750 is also rescaled.
Notes:
Theflowmetermustbe correctly earthedbytheexternalclamptype terminal on theoutside
of the enclosure.
After commissioning the end caps must be replaced.
Remove the silica gel bag from the termination board end of the enclosure.
ItisimportantthattheDIVAislocatedcentrally
in the pipework as any eccentricity may
cause inaccurate readings. The DIVA has
been designed with integral centering webs,
which locate on the internal diameter of the
pipework.
Integral centering
webs
Fig. 12
Display/recorderwith
4 - 20 mA passive
input (not supplying
current loop) U
Fuse
100 mA
Fuse
100 mA
Protective external
earth clamp
Energy management
system I/O block
R
Power
max.
28 V
0 V
NPN Input
Power
max.
28 V
0 V
PNP Input
R
R ³10 kW
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Fig. 14
28
9
001000
V (volts)
R (ohms)
DIVA operating range
V = 0.022R + 6
9 V £V £28 V
Power supply requirements
A nominal 24 Vdc is needed to power the flowmeter. However, the DIVA will operate correctly
as long as the power supply is in the range shown in Figure 14. A single, stand-alone, supply
may be capable of powering several transmitters. It can be mounted in a control room or in the
field,butcannotbeonthesameloop.Followthepowersupplymanufacturer’srecommendations
with regard to mounting and environmental considerations.
The graph (Figure 14) shows the range of power supply voltages and loop resistances over
which the DIVA is capable of operating. The loop resistance includes all the wiring.
Cable length
Generally the maximum cable length between the DIVA and the power supply is 3 000 m.
However the actual cable length is governed by the number of network devices, the total
resistance of the network and the cable capacitance.
Suggested cable type: for both loop and pulse should be unshielded twisted pairs such as
Belden 8205 (20 Awg), seven stranded wire with cross sectional area of 0.5 mm².
Cable glands suitable for M20 x 1.5 to EN 50262/IP68 are recommended.
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IM-P337-18 MI Issue 4 13
4. Commissioning
°C
Sec
%
mA
!
Fig. 16
After all mechanical and electrical work has been completed, the following commissioning
instructions should be followed.
The DIVA flowmeter should be commissioned with the flow through the unit isolated.
All commissioning is carried out through the display unit installed behind the front end cap of
the DIVA enclosure. The display unit consists of a small LCD display and a 5 button key pad.
The display is not designed to be used as a permanent flow indicator and does not record total
flows. If a permanent indicator is required an additional display/flow indicator is required.
These are available from Spirax Sarco Ltd.
As all the commissioning settings are stored in a non-volatile memory, it is possible to connect
a 9 V PP3 battery to the DIVA's 4 - 20 mA loop power supply and commission the unit
uninstalled. However, the DIVA should still be zeroed in-line (see Section 4.5.3) and its
operation checked.
Rotating the display
The display can be rotated through 180°to enable ease of commissioning. To rotate the
display disconnect the power supply, remove the mounting screws on the display unit,
carefully remove the display unit and rotate. Carefully replace the display unit and replace
mounting screws. Do not force the display unit into position. Reconnect the power supply.
Note: Electrostatic discharge (ESD) procedures should be followed while rotating the
display.
4.1 Run mode
Normally, the DIVA will operate in the run mode, displaying the flow, power, pressure or
temperature of the fluid passing through the pipeline.
After initial power up, the DIVA will automatically enter the run mode and all commissioning
menus can be accessed from this mode. (See Section 4.2, Commissioning mode, for details
on how to commission).
Arrow
Fig. 15 DIVA display unit
°C
S
ec
%
mA
!
LCD display
5 button keypad
Mounting screws
Note: The DIVA is factory set
to display data in metric units.
See Section 4.4.2, page 18,
to commission the DIVA
to display imperial units.
In the run mode the fluid data is displayed on
several screens which can be accessed by
pressing the up or down keys. The display
shows a numeric value and an arrow
indicating the reading type, i.e. flow, power,
pressure or temperature. All units (except
°C) are implied with imperial or metric units
being indicated by another arrow.
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The following chart indicates the run mode data display sequence.
Depending on the configuration, the flow units will be:
Units Steam
Metric Kg/h, KW, bar g, °C
Imperial lb/h, MBtu/h, psi g, °F
The DIVA is factory set to display steam data in metric units and pressing the up or down
keys will scroll through the following data.
4.1.2 Error display messages
Any errors that occur will be displayed in the run mode. The errors will alternate with the normal
run mode display and will be prioritised. The errors will be latched and can only be cancelled by
pressing the 'OK' button. Once the error message has been cancelled the display will show the
next (if any) error.
Any continuous error will reinstate itself 2 seconds after it has been cancelled, and will be
indicated by a flashing exclamation mark (!).
Certain errors will also cause the 4-20 mA alarm signal to be initiated.
The error messages are displayed over two screens and are:
= Power interrupted.
No signal from sensor.
= (This can also activate
the 4-20 mA alarm).
Signal from sensor constant.
= (This can also activate
the 4-20 mA alarm).
= Flow above the maximum.
°C
Sec
%
mA
!
°C
Sec
%
mA
!
°C
Sec
%
mA
!
°C
Sec
%
mA
!
Fig. 17
POWER
OUt
NO
SIGNL
SENSR
CONS
t
HIGH
FLOW
Pressure
Flow
4.1.1 Run mode data sequence
Temperature
Power
Flow
Power
Pressure
Temperatur
e
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IM-P337-18 MI Issue 4 15
BASIC
dAtA
MEtER
OUt
PUts
tESt
ALARM
SW.VER
SEt
PASS
xxxx
x
ENtER
PASS
ENtER
PASS
BASIC
dAtA
8888
4.2 Commissioning mode
The commissioning mode is used to zero the flowmeter, re-range, set and test the outputs
and change the pass code.
All data entry is performed via a menu and sub menu configuration with the key pad buttons
used for navigation, i.e. to go deeper into the menu the right hand key is pressed, to scroll up
and down the menu the up and down keys are pressed and to exit from a sub-menu the left key is
pressed. Any data is entered using the OK button. The previously entered selection will flash.
After a period of five minutes without any keys being pressed the DIVA will automatically
default to the run mode.
For a full commissioning flow chart see Section 4.3.
To enter the commissioning mode press and hold down the 'OK' key for 3 seconds. The display
then shows:
Followed by:
The leading digit will flash indicating that this is the position of the cursor.
The default factory set pass code is 7452. (This can be changed from within the commissioning
mode). The pass code can be entered by using the up and down keys to increment the flashing
value and the left and right keys to move the cursor. Pressing 'OK' will enter the pass code.
If an incorrect pass code is used the display will automatically return to the run mode.
After the correct pass code is entered the display shows:
To exit from the commissioning mode at any stage, continually pressing the left key will return
to the run mode.
Pressing the up and down buttons scrolls through the various first level menus.
Pressing the right arrow button enters a particular sub-menu.
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4.3 DIVA commissioning flow chart
LOW
OFF
HIGH ALARM
SW.VER
SEt
PASS
xxxx
xxxx
Error Messages
These alternate with the normal run mode display.
Theywillbeprioritisedandwillbelatchedwhenthey
occur.
Pressing the 'OK' button will cancel the displayed
alarm and allow the next one to be viewed.
A continuous alarm will re-occur on the display
2 seconds after it has been cancelled.
POWER
OUt
NO
SIGNL
SENSR
CONST
HIGH
FLOW
The 4-20 mA alarm
can also be activated
Shows when flow
exceeds maximum
Power
interrupted
No signal
from sensor
Signal from
sensor constant
Flow above
maximum
OUt
PUtS
tESt
(test
display
)
VER x.x ENTER
PASS xxxxx
Temp. °C
POWER
FLOW
Pressure
Flow kg/h or
lb/h for steam.
Pressure bar g or psi g,
depending if metric or
imperial units are selected.
Temperature °C or °F.
BASIC
dAtA
MEtER
Power kW or MBtu/h.
Normal run mode
display sequence
Default = 7452
but user settable.
Configuration
sub-menus
The 4-20 mA alarm
can also be activated
Softwareversion
number
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IM-P337-18 MI Issue 4 17
4-20 mA
PULSE
dISP
PULSE
OUt
CANCL
4-20m
A
OUt
xxx.xx
xxx%
xxxxx
AtMOS
PRES
UNItS
dRy
dIR
S/N
ZErO
MEtER
OFF
ON
xxx.xxm
A
yES
NO
Must not exceed 4 pulses
per second.
HORIZ
DOWN
IMP
MEt
UP
NUM
/
PULSE
PULSE
WIDTH
SORC
E
Sets 4 and 20 mA to an
equivalent flowrate or power.
CHECK
4 mA
CHECK
20 mA
SEt.4 mA
SORCE
SEt.20 mA
in kg or lbs, MJ or MBtu.
tOtAL
xxxxx
xxxmS
ENRgy
Connect a DVM and use
the up and down keys to
set 4 or 20 mA.
in kg/h
or lb/h,
kW or
Btu/h.
FLOW
POWER
OP = 4mA
xxxxx
xxxxx
OP = 20 mA
Sets the pulsed output to an
equivalent flowrate or power.
Note: When the dIR sub-menu is entered, HORIZ is
always shown first. The actual direction selected
is the direction which is flashing.
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4.4.1 dRy
Pressing the right key will display the dryness fraction. This is the dryness fraction of the
saturated steam being measured. This can then be edited to suit the application. Press the 'OK'
button to confirm the selection.
After the dryness fraction is entered the display will automatically step to the next sub menu
and show 'UNItS'
4.4.2 UNItS
The units displayed and transmitted can be selected between metric (MEt), and imperial (IMP).
A summary of the units is detailed in the Table below.
Units Steam
Metric Kg/h, KW, bar g, °C
Imperial lb/h, MBtu/h, psi g, °F
Select either 'MEt' or 'IMP' and press the 'OK' button to confirm.
4.4.3 AtMOS PRES
This value compensates the flowrates for atmospheric pressure. It should be used if a high
degree of accuracy is required or when the DIVA is installed high above sea level.
Note: Values up to two decimal places can be entered.
If metric units are selected pressure units are bar absolute, for imperial units psi absolute.
4.5 MEtER Sub-menu
4.4 BASIC DAtA Sub menu
BASIC
dAtA
AtMO
S
PRES xxx.xx
UNItS
dRy
IMP
MEt
xxx%
This sub-menu contains information
about the flowmeter and is used to
zero the flowmeter.
4.5.1 dIR
dIR is the orientation that the DIVA is installed in. The DIVA can be installed with horizontal
flow up to a pressure of 32 bar g (464 psi g). For installations that require vertical flow either
up or down the maximum pressure must not exceed 11 bar g (160 psi g). By selecting down or
up the effect of gravity on the cone is taken into account.
Note: Upon entering the dIR sub-menu, HORIZ is always shown first. The actual direction
selected is the one which is flashing.
4.5.2 S/N
This is the factory set serial number of the DIVA and is displayed by pressing the right key.
MEtER dIR
S/N
ZErO
MEtER
XXX
HORIZ
DOWN
UP
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IM-P337-18 MI Issue 4 19
OUt
PUtS
PULSE
4-20mA
4.5.3 ZErO MEtER
This function is used to zero the DIVA manually to compensate for any electronic drift.
The procedure for zeroing the flowmeter is as follows:
-Isolate the pipeline where the flowmeter is installed and ensure that there is no flow. The
line temperatures should be above 5°C (41°F) and below 30°C (86°F).
-Press and hold the 'OK' button for three seconds.
On completion the display will step back to S/N.
If 'ZErO ErrOr' is displayed, check to ensure that the line is isolated with no flow. If 'tEMP ErrOr'
isdisplayedthelinetemperatureisbelow5°C(41°F).Allowthetemperaturetomoveabove5°C(41°F)
and re-zero. Note: The flowmeter should ideally be zeroed once every 12 months.
4.6 OutPutS Sub-menu
This sub-menu allows both the
4-20 mA and pulsed outputs of
the flowmeter to be configured.
4.6.1 4-20 mA Output sub-menu
The 4-20 mA sub-menu allows
re-ranging and re-calibrating of
the 4-20 mA output.
4.6.2 SORCE
This changes the source data for the 4-20 mA between flow and power.
4.6.3 SEt 4 mA
This sets the value for the flowrate or power, which is equivalent to 4 mA. The minimum value
that can be set as 4 mA is 0 and the maximum is the 20 mA equivalent value less one.
4.6.4 SEt 20 mA
This sets the value for the flowrate or power, which is equivalent to 20 mA. The minimum value
that can be set as 20 mA is the 4 mA equivalent value plus one and the maximum is the meters
rated maximum at 32 bar g. The 20 mA value must always be a minimum of one greater than
the 4 mA value.
4.6.5 CHECK 4 mA
This allows the 4 mA value to be re-calibrated. A digital volt meter/multimeter should
be connected in series with the 4-20 mA output. Pressing the right arrow button will display
OP = 4 mA and the DIVA will output a steady 4 mA. If the multimeter does not read 4 mA the
up and down arrow buttons can be pressed to alter this current until 4 mA exactly is indicated.
Pressing the 'OK' button confirms the setting.
OUt
PUtS 4-20 mA FLOW
POWER
SORCE
OP = 4mA
XXXX
XXXX
OP = 20 mA
CHECK
4 mA
CHECK
20 mA
SEt.4 mA
SEt.20 mA
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tESt dISP
PULSE
OUt
CANCL
4-20m
A
OUt
OFF
ON
xxx.xxm
A
4.6.6 CHECK 20 mA
This allows the 20 mA value to be re-calibrated. A digital volt meter/multimeter should
be connected in series with the 4-20 mA output. Pressing the right arrow button will display
OP = 20 mA and the DIVA will output a steady 20 mA. If the multimeter does not read 20 mA the
up and down arrow buttons can be pressed to alter this current until 20 mA exactly is indicated.
Pressing the 'OK' button confirms the setting.
4.6.7 Pulse Output
This sub-menu allows the
pulsed output to be configured.
4.6.8 PULSE
This selects whether the pulsed output is to be used or disabled.
4.6.9 SORCE
This selects the source data for the pulsed output. The source data can be either unit mass per
pulse (tOtAL) or unit energy per pulse (ENRgy).
4.6.10 NUM/PULSE
This allows the total mass, or energy, which is equivalent to one pulse to be configured.
Units are dependent on the UNIt setting. Metric units will be kg for total or MJ for energy,
imperial units will be lb for total or MBtu for energy.
4.6.11 PULSE WIDTH
Thisallowsthe width ofthe pulse tobeset. Thewidthcan be setin0.01 secondincrementsfrom
0.02 seconds to a maximum of 0.2 seconds.
4.7 tESt sub-menu
PULS
E
NUM
/
PULSE
PULSE
WIDTH
SORC
E
yES
NO
xxxmS
xxxxx
tOtAL
ENRg
y
The tESt sub-menu allows access to the DIVAs diagnostic tools. From here the display,
4-20 mA and pulse outputs can be tested.
p337_18.p65 1/27/05, 11:26 AM20