Viatran IDP10-A Use and care manual

[1]
98MANALIDP10AV Rev. A 8/16/11
I/A Series ® Intelligent
Differential Pressure Transmitters
IDP10-A with 4 to 20 mA Output Signal
IDP10-V with 1 to 5 VDC Output Signal
Installation, Calibration, Configuration,and
Maintenance
3829 Forest Parkway, Suite 500
Wheatfield, NY 14120
Int’l: 1-716-629-3800
Toll Free: 1-800-688-0030
Fax: [phone]
www.viatran.com
[email protected]

[2]
98MANALIDP10AV Rev. A 8/16/11
Table of Contents
Figures........................................................................................................................................................... 4
Tables............................................................................................................................................................ 5
1. Introduction..................................................................................................................................... 6
General Description ......................................................................................................................... 6
Reference Documents...................................................................................................................... 6
Transmitter Identification................................................................................................................ 6
Standard Specification ..................................................................................................................... 7
Product Safety Specifications......................................................................................................... 10
2. Installation..................................................................................................................................... 12
Transmitter Mounting.................................................................................................................... 12
Process Mounted Transmitter .......................................................................................... 13
Pipe or Surface Mounted Transmitter.............................................................................. 13
Installation of Flow Measurement Piping...................................................................................... 15
Filling System with Seal Liquid ....................................................................................................... 17
Positioning Housing ....................................................................................................................... 17
Positioning Display......................................................................................................................... 17
Cover Locks .................................................................................................................................... 18
Transmitter Wiring for IDP10-A ..................................................................................................... 18
Accessing Transmitter Field Terminals ............................................................................. 19
Wiring the Transmitter to a Control Loop ........................................................................ 20
Putting Transmitter into Operation ............................................................................................... 22
Taking the Transmitter Out of Operation ...................................................................................... 22
Transmitter Wiring for IDP10-V ..................................................................................................... 23
3-Wire Connection............................................................................................................ 23
4-Wire Connection............................................................................................................ 23
Wiring to a Control Loop................................................................................................... 25
Putting Transmitter into Operation ............................................................................................... 27
Taking the Transmitter Out of Operation ...................................................................................... 27

[3]
98MANALIDP10AV Rev. A 8/16/11
3. Calibration and Configuration ...................................................................................................... 28
Calibration Setup ........................................................................................................................... 28
Field Calibration Setup................................................................................................................... 28
Bench Calibration Setup................................................................................................................. 30
General Calibration Setup.............................................................................................................. 31
Notes for Electronic Version –A and -V.......................................................................................... 32
Calibration and Configuration Using the Local Display.................................................................. 34
Calibration......................................................................................................................... 36
IDP10-A and IDP10-V Calibration .................................................................................. 37
Zero Adjustment Using External Zero Button................................................................... 38
Configuration .................................................................................................................... 38
IDP10-A and IDP10-V Configuration.............................................................................. 40
Re-ranging and IDP10-A or IDP10-V Transmitter .......................................................... 42
IDP10-A and IDP10-V Character Lists ............................................................................ 43
Testing the Display......................................................................................................................... 44
Error Messages .............................................................................................................................. 45
4. Maintenance.................................................................................................................................. 47
Parts Replacement......................................................................................................................... 47
Replacing the Electronics Module .................................................................................... 47
Removing and Reinstalling the Housing Assembly ........................................................... 48
Replacing the Sensor Assembly ........................................................................................ 48
Replacing the Terminal Block Assembly ........................................................................... 50
Rotating Process Covers for Venting ............................................................................................. 50
Index ........................................................................................................................................................... 52

[4]
98MANALIDP10AV Rev. A 8/16/11
Figures
1 Transmitter Identification...................................................................................................................... 6
2Minimum Allowable Absolute Pressure vs. Process Temperature w/Fluorinert Fill Fluid ................... 9
3Process Mounted Transmitter ............................................................................................................ 13
4Mounting Transmitter to a Pipe or Surface ........................................................................................ 14
5Example of Horizontal Process Line Installation................................................................................. 16
6Example of Vertical Process Line Installation ..................................................................................... 16
7Positioning Display.............................................................................................................................. 18
8Accessing Field Terminals ................................................................................................................... 19
9Identification of Field Terminals ......................................................................................................... 19
10 Supply Voltage and Loop Load ............................................................................................................ 20
11 Loop Wiring ......................................................................................................................................... 21
12 Wiring Several Transmitters to a Common Power Supply .................................................................. 22
13 Identification of Field Terminals.......................................................................................................... 23
14 Three-Wire Connection ....................................................................................................................... 24
15 Four-Wire Connection ......................................................................................................................... 24
16 Loop Wiring ......................................................................................................................................... 25
17 Wiring Several Transmitters to a Common Power Supply (Four-Wire) .............................................. 26
18 Field Calibration Setup ........................................................................................................................ 30
19 Calibration Setup of Electronic Equipment ......................................................................................... 30
20 Bench Calibration Setup ...................................................................................................................... 31
21 Local display Module ........................................................................................................................... 34
22 Top Level Structure Diagram ............................................................................................................... 35
23 Calibration Structure Diagram............................................................................................................. 37
24 Configuration Structure System .......................................................................................................... 40
25 Display Test Segment Patterns............................................................................................................ 44
26 Replacing the Sensor Assembly........................................................................................................... 49
27 Replacing the Sensor Assembly (Code 78/79 pvdf Inserts)................................................................. 49
28 Sensor Cavity Venting and Draining .................................................................................................... 51

[5]
98MANALIDP10AV Rev. A 8/16/11
Tables
1 Electrical Safety Specifications .............................................................................................................. 11
2 Calibration Menu................................................................................................................................... 36
3 IDP10-A and IDP10-V Configuration Menu ........................................................................................... 38
4 Alphanumeric Character List ................................................................................................................. 43
5 Numeric Character List .......................................................................................................................... 43
6 Error Messages ...................................................................................................................................... 45

[6]
98MANALIDP10AV Rev. A 8/16/11
1. Introduction
General Description
The IDP10-A and IDP10-V Differential Pressure Transmitters measure the difference between two
pressures applied to opposite sides of a silicon strain gauge microsensor within
the sensor assembly.
This microsensor converts differential pressure to a change in
resistance. The resistance change is then
converted to a 4 to 20 mA or 1to 5 VDC signal
proportional to differential pressure or to the square root
of differential pressure. The
measurement signal for the IDP10-A is transmitted to remote receivers over
the same two wires
that supply power to the transmitter electronics.
The transmitters are often used for measuring fluid flow across a primary device such as an orifice
plate, but can also be used for other types of differential pressure measurements such as liquid level,
interface level, or density measurements.
Reference Documents
This document contains descriptions and instructions for transmitter installation, configuration,
calibration, and
maintenance.
Transmitter Identifica tion
See Figure 1 for transmitter data plate contents. When the transmitter is powered,the firmware
revision is shown on the top line of the display.

[7]
98MANALIDP10AV Rev. A 8/16/11
Standard Specifications
Span and Range L i mi t s
Span Limit
Code
Span Limits
∆ PRange Limits
∆ P
A
0.12 and 7.5 kPa (0.5 and 30 inH2O) -7.5 and +7.5 kPa (-30 and +30 inH2O)
B 0.87 and 50 kPa (3.5 and 200 inH2O) -50 and +50 kPa (-200 and +200 inH2O)
C 7.0 and 210 kPa (28 and 840 inH2O) -210 and +210 kPa (-840 and +840 H2O)
D 0.07 and 2.1 MPa (10 and 300 psi) -0.21 and +2.1 MPa (-30 and +300 psi)
E 0.7 and 21 MPa (100 and 3000 psi) -0.21 and +21 MPa (-30 and +3000 psi)
Negative values of differential pressure indicate lowside of sensor at the higher pressure.
Positive values indicate high sideof sensor at the higher pressure.
Elevated Zero and Supp r es s e d Zero
For applications requiring an elevated or suppressed zero, the maximum span and the upper and lower
range limits
ofthe transmitter can not be exceeded.
Transmitter Configuration Bolting Mater i al
Maximum Static
and
Over-range Pressure
Rating(a,e)
Proof
Pressure
Rating(b)
MPa Psi MPa Psi
Standard (B7 steel), Option "-B2" (17-4 PS ss), Option
“-D3” or “-D7”(c)
25 3625 100 14500
Option “B1” (316 ss) or Option "-D5"(c) 15 2175 60 8700
Option AS-B7M (B7M) 25 3625 100 14500
Option “-D1”(c) 16 2320 64 9280
Option “-D2”, “-D4”, "-D6", or "-D8"(c,d) 10 1500 40 6000
(a) Either side can be at the higher pressure during over-range.
(b) Meets ANSI/ISA StandardS82.03-1988.
(c)-D1 = DIN
Single ended process cover with M10 bolting.
-D2 = DIN Double ended
process cover with M10 bolting
-D3 = DIN
Single ended process cover with 7/16 in bolting.
-D4 = DIN Double ended
process cover with 7/16 in bolting.
-D5 = DIN Single ended process cover with 7/16 in 316 ss bolting.
-D6 = DIN Double ended
process cover with 7/16 in 316 ss bolting.
-D7 = DIN
Single ended process cover with 7/16 in 17-4 ss bolting.
-D8 = DIN Double ended process cover with 7/16 in 17-4 ss bolting.
(d)Limited to operating temperatures ranging from0 to 60 °C (32 to 140°F)
(e)When
Structure Codes 78/79 are used (pvdf inserts in the Hi and Lo side process covers), the
maximum over-range is 2.1 MPa (300 psi) and temperature limits are -7 and +82°C (20 and 180°F).
NOTE
Static pressure zero shift for all calibrated spans canbe eliminated by readjusting the
zero output at nominal operating static p r e ss u r e .
! CAUTION
1. Exceeding the maximum over-range pressure can cause damage to the tran s mit ter
degrading its performance.
2. The transmitter couldbe nonfunctional after application of the proof p r e ss u r e .

[8]
98MANALIDP10AV Rev. A 8/16/11
Output Si gnal
4 to 20 mA dc linear, 4 to 20 mA dc square root, or 1 to 5 VDC, software selectable,
locally configurable using pushbuttons on the transmitter.
Zero and Span Adju s t men t s
Adjustable at the transmitter using the local display. Anoptional external s e lf-c o n t ai ne d
moisture sealed pu s h bu tt o n assembly allows local resetting of zero without removing
housing cover.
Field Wiring R eve r sal
Accidental reversal of field wiring will not damage the transmitter, provided the current i s
limitedto 1 A or less by active current limitingor loop resistance. Sustained currents of
1 A will not damage the electronics moduleor sensor but could damage the terminal
block assembly and external instruments in the loop.
Mounting Pos iti on
The transmitter can be mounted in anyorientation. It can be supported bythe process
piping. It can also bemounted directly to a vertical or horizontal pipeor surface mou n te d
using an optionalmounting bracket. The housing can be rotated up to one full turn t o
any desired positionfor access to adjustments, display, or conduit connections. See
“Positioning Housing” on page 13. The display can also be rotated in the housing to any
of four different positions at 90° increments. See “Positioning Display” on page 13.
NOTE
Position effect zero shiftfor all calibrated spans can be eliminated by r e adju s t in g zero
output after i n s t a lla tion.
Adjustable Damping
The transmitter response time is normally 1.0 second or the electronically adju s t a b le
setting of 0.00 (none), 2, 4, or 8, seconds, whichever is greater, for a 90% recovery from
an 80% input step as defined in ANSI/ISA S51.1.
Operative Lim i ts
Influence
Operative Limits
Sensor Body Temperature
Silicone Fill Fluid
Fluorinert Fill Fluid
pvdf Inserts
-46 and +121°C (-50 and +250°F)
-29 and +121°C (-20 and +250°F)
-7 and +82°C (20 and 180°F)
Electronics Tem p eratu r e
With LCD Display
-40 and +85°C (-40 and +185°F)(a)
Relative Humidity
0 and 100%
Supply Voltage
IDP10-A 11.5 and 42 VDC(b)
IDP10-V 9 to 15.5 VDC
Output Load
IDP10-A 0 and 1450 Ohms
IDP10-V 10 MegOhms
Mounting Position
No Limit
(a) Display updates are slowed and readability decreased below temperatures of -20°C (-4°F).
(b) 11 V dc with optional
shorting block (AS code SB-11

[9]
98MANALIDP10AV Rev. A 8/16/11
Sen s o r Fill F l u i d
Silicone Oil (DC 200), or Fluorinert(FC-43).
Minimum Allowable Absolute P r es s u re vs. P r oce ss Temperature
With
Silicone Fill Fluid
With Fluorinert Fill Fluid
At full vacuum: Up to 121°C (250°F)
Refer to Figure 2.
Power-Up Time
Less than 2.0 seconds for output to reach approximately 3.5 mA, and then at the
electronic dampingrateto the final measured variable value.
E l ec tri ca l Connections
Field wires enter through PG 13.5 or 1/2 NPT threaded entrances on either side of the
electronics housing. Leads terminateunder screw terminals and washers on the
terminal block in the field terminalcompartment. To maintain RFI/EMI,
environmental, and explosion proof ratings, unused conduit connection must be
plugged with metalplug (provided), inserted to five full turn s .
P r oce ss Connections
IDP10
transmitters are connected to the process via a 1/4 NPT thread or anyone of a
number of optional process co nn e c t o r s .
Supply Current
Power supply must be capable of providing 22 mA current for the IDP10-A and 3 mA
current for the IDP10-V. Ripple of up to 2 V pp (50/60/100/120 Hz) is tolerable, but
instantaneous voltage must remain within specified range.

[10]
98MANALIDP10AV Rev. A 8/16/11
Electrical Ground Conne cti ons
The transmitter
is equipped with an internalground connectionwithin the field wiring
compartment and an external ground connection at the base of the electronics housing.
To minimize galvanic corrosion, place the wire lead or terminal between the captive
washer and loose washer on the external ground screw. If shielded cable is used, earth
(ground) the shield at the field enclosure only. Do not ground the shield at the
tra n s mit te r .
Test Po int s
The banana plug receptacles (designated CAL) can be used to check transmitter output of
the IDP10-A. Measurements should be 100 to 500 mV dc for 0 to 100% transmitter
output. Refer to Figure 9.
HHT Terminals
As the top terminal is blocked, this transmitter does not communicate with the HHT, PC10,
PC20, HART Communicator, or I F DC.
Approximate Mas s
Without
Process Connectors 3.5 kg (7.8 lb)
With Process Connectors 4.2 kg(9.2 lb)
With Optional 316 ss Housing Add1.1 kg(2.4 lb)
Process Wetted Mate ri als
Diaphragm: 316L ss, Co-Ni-Cr, Hastelloy C, goldplated316L ss, Monel, or tantalum
Covers and Process Connections: 316 ss, carbon steel, Hastelloy C, Monel,or pvdf inse r t s
Product Safety Specifications
!
DANGER
To prevent possible explosions and to maintain explosion proof, dust-ignition proof
protection, observe applicable wiring practices. Plug unused conduit opening withthe
provided metalpipeplug, which engages a minimum of five fullthreads.
! WARNING
To maintain IEC IP66 and NEMA Type 4X protection, the unused conduit opening
must be plugged. In addition, the threaded housing covers must be installed.
T urn covers until O-ring contacts housing; then continue to hand tighten as much
as possible (at least 1/4 turn).

[11]
98MANALIDP10AV Rev. A 8/16/11
NOTE
1. These transmitters have been designed to meet the electrical safety de s c rip t io n
listed in Table 1. For detailed information or statusof testing laboratory
approvals and certifications, contact Viatran.
2. Wiring
restrictions requiredto maintain electrical certification of the t r a n s mit t er
are provided in the “Transmitter Wiring” section of this document on page 15.
Table 1. Electrical Safety Specifications
Testing Laborator y,
Types of
Protection,
and Area Classification
Application
Co ndition s
Electrical
Safety
Design Co de
CSA intrinsically safe for Class I,
Division 1, Groups A, B, C, and D; Class
II, Division 1, Groups E, F, and G; Class
III, Division 1.
Connect per CD 0629. Temperature
Class T4A at 40°C (104°F) and T3C at
85°C (185°F) maximum ambient.
IDP10-V only.
C
CSA explosion proof for Class I, Division
1, Groups B, C, and D; Dust ignition
proof for Class II, Division 1, Groups E,
F, and G; Class III, Division 1.
Temperature Class T6 at 80°C (176°F),
and T5 at 85°C (185°F) maximum
ambient.
CSA for Class I, Division 2, Groups A, B,
C, and D; Class II, Division 2, Groups F
and G; Class III, Division 2.
Connect to source not exceeding 42.4
V. Temperature Class T6 at 40°C
(104°F) and T4A at 85°C (185°F)
maximum ambient. IDP10-V only.
FM intrinsically safe for Class I, Division
1, Groups A, B, C, and D; Class II,
Division 1, Groups E, F, and G; Class III,
Division 1.
Connect per CD 0629. Temperature
Class T4A at 40°C (104°F) and T4 at
85°C (185°F) maximum ambient.
IDP10-V only.
F
FM explosion proof for Class I, Division
1, Groups B, C, and D; Dust ignition
proof for Class II, Division 1, Groups E,
F, and G; Class III, Division 1.
Temperature Class T6 at 80°C (176°F),
and T5 at 85°C (185°F) maximum
ambient.
FM nonincendive for Class I, Division 2,
Groups A, B, C, and D; Class II, Division
2, Groups F and G; Class III, Division 2.
Connect to source not exceeding 42.4
V. Temperature Class T6 at 40°C
(104°F) and T4A at 85°C (185°F)
maximum ambient. IDP10-V only.

[12]
98MANALIDP10AV Rev. A 8/16/11
2. Installation
The following material provides information and procedures for installing the IDP10-A and
IDP10-V Differential Pressure Cell Transmitter.
! CAUTION
To avoid damage to the transmitter sensor, do not use anyimpact devices, such as an
impact wrench or stamping device, on the tra n s mit ter .
NOTE
Use a suitable thread sealant on allconnections.
Transmitter Mounting
The
transmitter can be supported bythe process piping as shown in Figure 3, or mounted to a
vertical or horizontal pipe or surface using the optionalmounting bracket shown in Figure 4.
NOTE
1. If the transmitter is not installed in the vertical position as shown in Figure 3 or
Figure 4, readjust zero output to eliminate the position zero effect.
2. The transmitter should be mounted so that any moisture condensing or
draining into the field wiring compartmentcan exit through one of the two
threaded conduit
connections.

[13]
98MANALIDP10AV Rev. A 8/16/11
Pr oces s - Mo unt e d Transmitter
Figure 3 shows the transmitter mounted to and supportedby the process piping.
Pipe or Surface Mounted Transmitter
To mount the transmitter to a pipe or surface, use the Optional Mounting Set(ModelCode
Option -M).
Referring to Figure 4, secure the mounting bracket to the transmitter using the two screws
pro- vided. Mount the transmitterwith mounting bracket to a vertical or horizontal, DN 50
or 2-in pipe. To mount to a horizontal pipe, turn U-bolt 90 from the position shown in
Figure 4. The mounting bracket can also be used for wall mounting by securing the bracket
to a wall using the U-bolt mounting holes. Mounting kit extensions are available to allow
360° rotation of the t o p- works assembly. This provides better access to the rearvent/drain
whenthe transmitter i s mounted to a surface as shown in Figure 4.

[14]
98MANALIDP10AV Rev. A 8/16/11

[15]
98MANALIDP10AV Rev. A 8/16/11
Installationof Flow Measurement Piping
Figure 5 and Figure 6 show typical installations with horizontal and vertical process pipes.
The
transmitters are shown below the level of the pressure connections at the pipe (usual arrange-
ment, except for gas flow without a seal liquid), and with filling tees in the lines to the tra n s mit te r
(for a seal liquid).
If the processfluid being measured must not come in contact withthe transmitter, the tra n s mi tte r
lines must be filled with a suitable seal liquid (see procedure in next section). In sucha case, the
transmitter must be mounted below the level of the pressure connections at the pipe. With s t e a m
flow, the lines are filled with water to protect the transmitter from the hot steam. The seal liquid
(or water) is addedto the lines through the filling tees. To prevent unequal heads on the tran s mit -
ter, the tees must be at the same elevation (as shown in Figure 5) and the transmitter must be
mounted vertically (as shown). If a seal liquid is not required, elbows can be used in place of the
tees.
Tighten drain plugs and optional vent screws to 20 N m (15 lb ft). Tighten the four process con-
nector boltsto a torque of 61 N m (45 lb ft).
Note that the high and low pressure sides of the transmitter are identified byan L-H marking on
the side of the sensor above the warning label as shown in Figure 3.
With medium-viscosity seal liquids and/or long transmitter lines, larger valve sizes should beused.
NOTE
1. With a horizontal line, pressure connections at the pipe should be at the side of
the line. However, with gas flow without a seal liquid, connections should be at top
of line.
2. With a vertical line, flow should be upwards.
3. For liquid or steam flow, the transmitter should be mounted lowerthan
the pressure connections at the pipe.
4. For gas flow without a seal liquid, the transmitter should be mounted above
the pressure connections at the pipe; for gas flow with a seal liquid, the
tra n s m i tte r should be mounted belowthe pressure connections.
5. Viatran recommends the use of snubbers in installations prone to high levels of
flow pulsations.

[16]
98MANALIDP10AV Rev. A 8/16/11

[17]
98MANALIDP10AV Rev. A 8/16/11
Filling System with Seal Liquid
If the processfluid being measured must not come in contact withthe transmitter, the tra n s mi tte r
lines must be filled with a suitable seal liquid. The procedure to do this is as follows:
1. If the transmitter is in service, follow the procedure for “Taking the Transmitter O u t
of Operation” on page 18.
2. Close both process shutoff v a l v e s .
3. Open
all three valves on 3-Valve Manifold.
4.
Partially open vent screws on transmitter until all air has been forced out of
transmitterbodyand lines. Close vent s crews.
5.
Refill tee connections. Replace plugs and close bypass valve. Check for leaks.
6.
Follow procedure for “Putting Transmitter into Operation” on page 18.
! CAUTION
To prevent loss of seal liquidand contaminationof process fluid, never open both
process shutoff valves and manifold shutoff valves if bypass valve is open.
Pos i tion i n g Housing
The transmitter housing (topworks) can be rotated up to one full turn in the counterclockwise
direction when viewed from above for optimum access to adjustments, display, or conduit con-
nections.
! CAUTION
1. Do not rotate the housing more than one turn from the as received position. If
there is doubt about the housing rotationalposition,turn fully clockwise and
the n back off no morethan one full turn.
Positioning Display
The display can berotated within the housing to any of four positions at 90° increments. To do
this, refer to Figure 7 and perform the following:
1. Turn
off power source to transmitter.
2.
Screw in cover lock (if present) and remove the electronics compartment cover by
rotating it counterclockwise.
3. Remove electronics moduleby unscrewing two screws closest to sides of tra n s mit te r
and pullingout module.
4. If turning display 180 °, turn and return moduleto housing by reversing Step3.

[18]
98MANALIDP10AV Rev. A 8/16/11
5. If turning
display 90 ° in eitherdirection:
a.
Remove the two (2) plastic buttons (plugs) bypushingthem out from the
backside of the module.
NOTE
Plastic butt on s were not provided on some early versions of the electronics module.
b.
Unscrew the two (2) screws fromthe moduleand then rethread them back into
the moduleat 90° from their original position.
c. Insert the two (2) plastic buttons into the two open screw holes in the module.
(To order plastic buttons for earlier versions of the electronics modules or for
replacement, consult with the Factory.)
d. Return the moduleto the housing by reversing Step3.
6.
Reinstall the cover onto the housing byrotatingit clockwise until the O-ring contacts
the housing; then continue to hand tighten as much as possible (at least 1/4 turn). If
cover locks are present, align the serration in the cover with the lock and unscrew it
until it extends into the cover serration to prevent unwanted cover rotation.
7. Restore power to tran s mit ter .
Cover Locks
Electronic housing cover locks, shown in Figure 8, are provided as standard with certain agency
certifications and as part ofthe Custody Transfer Lock and Seal optio n.
T r a n s m i tte r W ir i ng for IDP10-A (4-20 mA Output Signal)
The installation and wiring of your transmitter must conform to local code r e q u i r em e n t s .

[19]
98MANALIDP10AV Rev. A 8/16/11
NOTE
Viatran recommends the use of transient/surge protection in installations prone to
high levels of electrical transients and surges.
Accessing Transmitter FieldTerminals
For access to the field terminals, thread the cover lock (if present) into the housing to clear the
threaded cover and remove the cover fromthe field terminals compartment as shown in Figure 8.
Note that the embossed letters FIELD TERMINALS identify the propercompartment.
Identification of terminals is shown in Figure 9.

[20]
98MANALIDP10AV Rev. A 8/16/11
Wiring the
Transmitter to a Control Loop
When wiring your transmitter, the supply voltage and loop loadmust be within specified limits.
The supply voltage vs. the output load relationship is shown in Figure 10. Any combinationof
supply voltage and loop load resistance in the shaded area canbe used. To determine the loopload
resistance (transmitteroutput load),add the series resistance of each component in the loop,
excluding the transmitter. The power supply must be capable of supplying 22 mA ofloop current.
Ex amples :
1. For a loop load
resistance of 860 the supply voltage can be any value from 30 t o
42 V dc.
2. For a
supply voltage of24 V dc, the loop load resistance canbe any value from zero t o
565
To
wire one or more transmitters to a power supply, proceed with the following s t e p s .
1.
Screw in cover lock (if present) and remove the field terminals compartment cover by
rotating it counterclockwise.
2. Run signal wires (0.50 mm2 or 20 AWG, typical) through one of the t r a n s mit t er
conduit connections as shown in Figure 11. Use twisted single pair to protect the
4 to 20mA output from electrical noise. Screened (shielded) cable may be required
in some locations.
NOTE
Do not run transmitter wires in same conduit as main (ac power) wires.
3. If
shielded cable is used, earth (ground)the shield at the power supply only. Do not