Product Data Document
225DS-26J / D301301X012
June 2013
3808 MVT Multivariable Transmitter
Model 3808-10A With P/T Variables
Featuring:
•
Excellent measurement performance over
the full range of operating pressure and
temperature conditions
•
Extremely low power consumption — perfect
for remote sites with battery and solar power
systems
•
“Bilingual” Networking via BSAP and Modbus
protocols with RS 485 interface — operates as
an RTU node on SCADA networks
•
Intrinsically safe and explosion proof for
operation in Class I, Division 1 hazardous areas
•
“Wet end” sensor assembly is independent of the “top end” assembly
•
Two versions: RS485 with RS232 port for
configuration or Analog Output with FSK signal.
Introduction
The 3808 MVT is Emerson Process Management’s answer to industry demands for a
transmitter with high reliability, high performance
over real world remote pressure and temperature
conditions, ease in use, “networkability” and very
low power consumption. The 3808 MVT has been
designed to provide the highest value in terms of all user considerations, including purchasing, installation, operation and maintenance.
To maximize measurement accuracy, the 3808 combines a wet end with a low reference
uncertainty of 0.075% URL, with a design that
minimizes effects of pressure and temperature over
the full range of operating conditions.
For remote sites such as those in the energy
and water industries, power consumption has
been a key consideration. Costs of batteries and
solar panels are proportional to current draw and
Remote Automation Solutions
The 3808 MVT Multivariable
Transmitter features accurate measurement
of gauge pressure and temperature.
many users are surprised at the capital expenses
associated with electronics, which have not been
designed to conserve power. The sophisticated
design employed by the 3808 MVT keeps current
draw well below 2 mA and with a power source as
low as 5 Vdc.
For remote sites, power budgeting is often very
tight. Since the power consumption is so low, the 3808 MVT can even be added to existing sites, which were designed with no extra capacity
for power.
While the BSAP (Bristol Synchronous and
Asynchronous) protocol ensures compatibility with
Emerson’s measurement and SCADA systems,
Modbus provides compatibility with a wide variety
of controllers, flow computers, RTU devices and
SCADA systems from numerous suppliers.
Functionality Overview
Emerson’s 3808 MVT provides the following basic
operations
•
Conversion of sensor readings from the “wet
Product Data Document
225DS-26J / D301301X012
June 2013
end” pressure sensor assembly into accurate
floating point pressure values. Conversion
calculations utilize correction coefficients
contained in the sensor assembly and are
performed once per second for each process
variable
•
•
•
•
Conversion of raw readings from an on-board
A/D into an accurate floating point RTD value. RTD conversions are performed once per
second
Up to 19200 baud, 2-wire RS-485 serial
communications interface, or a 1200 baud, FSK modem interface via the 4-20ma current
loop for Network communication
Local RS-232 serial communications interface
fixed at 19200 baud. (Connecting to the RS-232
communications interface disables the RS-485
communications.)
A subset of the Emerson BSAP RDB and Peer-to-Peer communications interface:
Complete set of User/Host Interface
functions for Configuration, Calibration, and Data Collection
Floating point values returned individually,
or in pre-defined Lists
Floating point values available for GP, T,
Sensor Temperature, and Error Status
Floating point, Logical, or String values
also available for other user configuration
parameters
•
Optional, 4-to-20 mA Analog Output:
Linear or Square Root Mode
•
2
3808 Multivariable Transmitter
Physical Overview
Service: Level, pressure, temperature measurements for liquids and gases.
Diaphragm Material: 316 SS or Hastelloy C
Connection Material: 316 SS or Hastelloy C
Fill Media: DC 200 Silicone Oil
Process Connections: ½” - 14 NPT male pipe
tap and ⅛” - 27 NPT female pipe thread on single
connection
Electrical Connections: ½” NPT Conduit Connection
Housing: Low Copper Aluminum with epoxy paint
NEMA 4X explosion proof.
Local indication: 4-½-Digit LCD display linear or
square root in engineering units.
RTD sensor: 3-wire platinum 100-ohm per DIN
43760 25 feet max.
User connections: 10-terminal (2-rows) tri-barrier
strip for + power, -power, RTD +, RTD-, RTD-, TXD,
and RXD.
Power Supply Information
Operating Voltage Range: 5 – 42 Vdc
Current Draw:
With RS 485: Less than 2 mA
Reversible Output Action
With FSK, but with 4 – 20 mA output disabled: Less than 3.2 mA
May be controlled externally to provide a remote AO
Turn-on time:
Optional, on-board LCD display with P and T information
Measured input variables will be within specifications less than two seconds after power is applied to the 3808 MVT.
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Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
Accuracy and Performance
Specifications
All specifications are for the digital, floating-point
signal.
Process Temperature Input Specifications
(for the interface, only, not including the RTD probe or wiring)
RTD Conversion Accuracy: ± 0.1°C, or ± 0.1% of
reading, whichever is greater
Gauge Pressure
Ambient temperature effect on RTD measurement:
Combined effects of nonlinearity, nonrepeatability
and hysteresis at reference pressure and over the
operating temperature range:
±0.01°C / ºC max
GP linear mode: ±0.075% of Calibrated Span or
0.015% of URL, whichever is greater.
± 0.25ºC / month max
Temperature effect on gauge pressure:
Analog Output Specifications
±0.21%URL maximum combined shift of zero and span with an ambient temperature change of 60ºC (108ºF)
Long Term Stability at Constant Conditions:
Non-linearity: 0.1% max
Temperature effects: +/- 0.25% Full Scale over 60
degrees C.
Long Term Stability at Constant Conditions:
±0.1% URL/Year typical
Environmental Specifications
Ripple and noise: Per ISA 50.1 Section 4.6
Over Pressure Limit: Equal to the gauge pressure
upper range limit (URL).
Process Temperature - RTD Interface
A three-wire platinum RTD per DIN 43760 is
supported. The temperature, T, in degrees Celsius
is calculated using the Resistance vs. Temperature
Tables according to the DIN EN 60751 standard for
Class A & B RTDs. The DIN EN 60751 equation is:
R(t) = R0 * (1 + At +Bt2)
Where:
A = 3.9083 * 10-3 oC-1
B = -5.775 * 10-7 oC-2
Ro = 100ohms
In addition, the user may enter the R0, A, and B
coefficients of a custom calibrated RTD, another
platinum standard or a different material (Nickel,
Balco or Copper). During the RTD calibration, the
User will be able to set the R0, A, and B coefficients,
restore the factory default for these coefficients, and
calibrate the internal Reference resistor.
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Temperature limits:
Wet End: -40 to +85ºC
Electronics: -40 to +85°C
With Display: -30 to +70ºC
Storage Temperature: -40 to +100°C
Humidity limits: When covers are properly installed, unit will withstand 0 to 100% RH (NEMA 4X enclosure)
Vibration: ±0.1%URL/g max 10-500 Hz in any axis per SAMA PMC-33-1C
Electromagnetic compatibility:
Conditions: Current output (only) twisted pair wires
includes RTD. Covers installed and wiring run in
grounded conduit. 10V/M, 20-500 MHZ per SAMA
PMC-33-1C:
GP: ±0.25%URL
RTD Temperature: ±1°C
3
Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
Liquid Crystal Display (LCD)
•
Set Modbus Node Address
The LCD displays the measured variables for P and T. The display will continually cycle though
all measured variables. The value and Engineering Units for a particular variable will be displayed
for three seconds. An annunciator indicates which
pressure variable is being displayed.
•
Set Modbus Mode (ASCII/RTU)
•
Enable/Disable Static Pressure Reading
•
Enable/Disable RTD Temperature Reading
•
Read current DP/GP, SP, T, Sensor
Temperature, and Status values
The LCD provides 4 1/2 digits of display precision
with a decimal point. The following Engineering
Units are included:
•
Read DP/GP and SP Upper Range Limits
•
Calibrate Zero/Span for DP/GP and SP
•
°C
•
Calibrate Zero for RTD
•
°F
•
Configure RTD Coefficients
•
BAR
•
Configure 4-20ma Analog Output
•
psi
Enable/Disable
•
in H2O @60°F
Select Forward/Reverse Acting
•
kg/cm2
•
kPa
Select Output Variable (DP/GP, SP, User
Defined, or None)
Calibrate Zero/Span
User Interface for the 3808 MVT
•
Select Engineering Units for DP/GP, SP, T
Using a lap-top personal computer, field personnel
can quickly calibrate and configure a 3808 MVT
transmitter. The personal computer interfaces to
the RS 232 port. Meanwhile, the RS 485 port wiring
need not be disconnected. RS 485 communication
is disabled only while the PC cable is connected to
the RS 232 terminals.
•
Set Floating Point Damping Factor
•
Display Transmitter Information (Traceability
information, Range Codes, Firmware Revision)
Emerson’s LocalView Calibration Tool includes all calibration and configuration operations. This tool will be familiar with users of Smartkit as well as all other Emerson flow computers and provides users of all Emerson measurement products a consistent and compatible Human-Machine Interface (HMI).
A variety of User Interface features are provided by the 3808 MVT. These include:
•
Set Communications Baud Rate
•
Set BSAP Local Address
•
Set BSAP Group Number
4
Communication Interface
BSAP Interface
The 3808 MVT will act as an immediate response
BSAP Slave device. The 3808 MVT will function
as a terminal node only in a BSAP Network. BSAP
Global messages received with the 3808 MVT’s
Local Address will be processed by the 3808 MVT.
Note that pass through, or routing, of BSAP Global
messages, Expanded BSAP messages, and TimeSync/Node Routing Table messages are not supported.
A subset of the RDB and Peer-to-peer messages
are supported. This will provide the user both RDB
and Peer-to-Peer List access to the 3808 MVT Process variables and parameters.
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Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
MODBUS Interface
Bendable RTD
The 3808 MVT will act as a Modbus compatible,
slave device. The 3808 MVT provides support for
both Modbus ASCII and Modbus Remote Terminal
Unit (RTU) transmission modes, utilizing a subset of
the Read/Write commands available via Modbus.
The user can select a bendable RTD that attaches
to the transmitter via an armored cable of 6-foot, 15-foot or 25-foot length. The individual wires connect to terminations on the termination plate. The RTD assembly also includes a fitting, which is installed in the conduit port.
To provide support for a variety of Modbus compatible host controllers, the 3808 MVT data available
via Modbus are mapped into Modbus Coils/Registers. To accommodate the different types of Modbus
hosts available (i.e. standard Modbus, ENRON
Modbus) floating point data items are mapped to
several different Modbus Register address ranges.
This provides both 16-bit and 32-bit register access
using the appropriate register address and function
code.
Accessories
Emerson’s OpenBSI/LocalView – Calibration and configuration software for a PC
If ordered along with the transmitter, the bendable
RTD assembly will be shipped in the same box as
the transmitter.
The bendable RTD is a “one size fits all” solution
that is perfect for most applications and excellent for
depot-level inventory situations in which the ultimate
installation (and, therefore, thermowell depth) is not
necessarily known.
The 12” probe can quickly be inserted in a thermowell, whereupon the user can tighten the included fitting to lock it in place and bend the excess length out of the way.
CD part number: 395575-02-8
Note that a thermowell is required for this bendable
RTD!
PC-to-3808-MVT Cable – Connects to the RS
232 port on the 3808 MVT, 10 foot, part number: 396596-01-0
Note also that the bendable RTD assembly is approved
only for use in Class I, Division 2 hazardous areas and
is not explosion proof.
Transmitter Interface Unit (TIU) – For compatibility
with the 3508, this module is used to connect a PC
to the FSK signal on the 3808 MVT.
Part Number 389959-01-4
For the TIU, please specify the modem cable length:
6 foot – part number 390929-01-8
12 foot – part number 390929-02-6
25 foot – part number 390929-03-4
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5
Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
Model Number: 3808-10A - A - B - C - D - E - F - G - H - J - J1 - K
3808-10A
CODE
DESCRIPTION
6
AB
Input Range (Gauge Pressure)
PSI
10
0-15 "H20 to 300 "H20
14
0-1.25 to 0-25 PSI
20
0-5 to 0-100 PSI
22
0-15 to 0-300 PSI
23
0-50 to 0-1000 PSI
25
0-150 to 0-3000 PSI
26
0-250 to 0-5000 PSI (with indication to 10,000 PSI)
27
0-100 to 0-2000 PSI
28
0-200 to 0-4000 PSI
29
3808MVT
X3508DIAPH
AB
C
C
Diaphragm Material
20
316 Stainless Steel
1
Hastelloy C
2
D
Filling Media
D
30
DC 200 Silicone
1
E
Comm / Output Options
E
40
4-20 mA current output / FSK Note: Local calibration requires TIU.
1
RS 485 Note: Local calibration requires RS 232 cable.
2
F
Local Indication
F
50
None
0
4 1/2 Digit LCD
1
X3808LIND
XTRANMTBKT
G
G
Mounting Bracket
60
None
0
With Mounting Bracket
1
H
Certification
H
70
UL/CUL Class I, Division 1, Groups C & D; Class I, Division 2, Groups A,B,C,D
1
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Product Data Document
3808 Multivariable Transmitter
225DS-26J / D301301X012
June 2013
Model Number: 3808-10A - A - B - C - D - E - F - G - H - J - J1 - K
3808-10A Model Specification Continued
J
Warning Plate
J
80
None
0
Russian
1
RTD / Cable Assembly
J1
J1
85
None
Please refer to the notes, below, concerning
0
With RTD and 6-foot Cable
the RTD Cable Assemblies.
1
With RTD and 15-foot Cable
2
With RTD and 25-foot Cable
3
DESCRIPTION
CODE
If selected in "J1" above, the RTD/Cable assembly will be shipped in the same box as the
transmitter. Due to UL restrictions, they cannot be shipped "pre-connected."
IMPORTANT: These particular RTD assemblies are not explosion-proof but are approved
for Class I, Division 2 hazardous areas. For explosion-proof RTD components, please
refer to "RTD Sensors and Related Accessories" in the price book.
K
Factory Configuration Options
K
88
Use the Standard, Defaults - Please DO NOT fill-in attachment 3800-A010
0
Specify Other Configuration Settings - Please proceed to attachment 3800A010.
1
To specify a 3808 MVT that is approved by Industry Canada for custody transfer installations
when used in conjunction with a ControlWave EFM or ControlWave XFC, please use the
following model number and attachment number:
3808-10A-28-112-001-000
3808-B-1
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7
Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
Attachment Number: 3800-A - AB - CD - E - F - GH - J - KL - M - N - P - R - T - U
3800-A
CODE
DESCRIPTION
AB
DP Units for 3808-30A or GP units for 3808-10A
AB
In H2O (Default)
Special Note for 25 PSI DP range: If you use
00
PSI
this attachment, "In H2O" become the default
01
mmH2O
units. If you want "PSI," you must specify
02
ftH20
that, here.
03
inHg
04
mmHg
05
90/160 KPa
06
MPa
07
BAR
08
mBAR
09
g/cm2
10
kg/cm2
11
SP Units for 3808-30A - Please note that this field is N/A for the 3808-10A
CD
In H2O
00
PSI (Default)
01
mmH2O
02
ftH20
03
inHg
04
mmHg
05
CD
92/170 KPa
06
MPa
07
BAR
08
mBAR
09
g/cm2
10
kg/cm2
11
Temperature Units for RTD Input
E
Degrees C (Default)
0
E
94/200 Degrees F
F
8
1
Communications Baud Rate
F
9600 (Default)
0
1200
1
96/205 2400
2
4800
3
19,200
4
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Product Data Document
3808 Multivariable Transmitter
225DS-26J / D301301X012
June 2013
Attachment Number: 3800-A - AB - CD - E - F - GH - J - KL - M - N - P - R - T - U
3800-A
DESCRIPTION
GH
BSAP Local Address
CODE
GH
Using two digits, including a leading zero for 1 - 9, please specify the address in
98/210 'GH,' ie. "01" through "32." For reference, the default address is 1.
J
BSAP Group Number
J
100/300 Please fill-in a single-digit between 1 and 8 in 'J.' Group 1 is the default.
KL
MODBUS Node Address
KL
Using two digits, including a leading zero for 1 - 9, please specify the address in
102/310 'GH,' e.g. "01" through "32." For reference, the default address is 1.
M
MODBUS Mode
M
ASCII (Default)
0
104/320 RTU
N
ENABLE / DISABLE 4 - 20 mA Output
N
ENABLE (Default)
0
106/330 DISABLE
P
P
LINEAR (Default)
0
R
FORWARD (Default)
0
1
4 - 20 mA OUTPUT VARIABLE
T
DP (in 3808-30A) or GP (in 3808-10A) (Default)
0
112/360 SP (3808-30A only)
U
1
4 - 20 mA FORWARD or REVERSE ACTING
110/350 REVERSE
T
1
4 - 20 mA LINEAR or SQUARE ROOT
108/340 SQUARE ROOT
R
1
1
TEMPERATURE
2
RTS DELAY
U
10 ms Default
0
50 ms that is known to work
best for Chesapeake CW LP
115/365 using Modbus
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1
9
Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
DIMENSIONED DRAWING
3808-10A with Mounting Bracket Shown
10
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Product Data Document
3808 Multivariable Transmitter
225DS-26J / D301301X012
June 2013
Simplified Diagram of 3808 MVT with 4 – 20 mA Signal
Simplified Diagram of 3808 MVT with RS 232 and RS 485 Interface
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11
Product Data Document
225DS-26J / D301301X012
June 2013
3808 Multivariable Transmitter
3808 MVT Wire Routing
3808 MVT Terminal Block Assignments
12
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Product Data Document
Multivariable Transmitter
225DS-26J / D301301X012
June 2013
Headquarters:
Emerson Process Management
Remote Automation Solutions
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Houston, TX 77072 U.S.A.
T +1 281 879 2699 | F +1 281 988 4445
www.EmersonProcess.com/Remote
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Emerson Process Management
Remote Automation Solutions
Unit 8, Waterfront Business Park
Dudley Road, Brierly Hill
Dudley UK DY5 1LX
T +44 1384 487200 | F +44 1384 487258
www.EmersonProcess.com/Remote
North American/Latin America:
Emerson Process Management
Remote Automation Solutions
6005 Rogerdale Road
Houston TX USA 77072
T +1 281 879 2699 | F +1 281 988 4445
www.EmersonProcess.com/Remote
Middle East/Africa:
Emerson Process Management
Remote Automation Solutions
Emerson FZE
P.O. Box 17033
Jebel Ali Free Zone – South 2
Dubai U.A.E.
T +971 4 8118100 | F +971 4 8865465
www.EmersonProcess.com/Remote
Asia-Pacific:
Emerson Process Management
Remote Automation Solutions
1 Pandan Crescent
Singapore 128461
T +65 6777 8211| F +65 6777 0947
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