INSTRUCTION MANUAL
Model 700 Series
Remote Sensor/Alarm Relay Module
With HART Interface
November 1, 2010• Document #3647• Revision 0.0
The Woodlands, Texas 77387
Ph.281.367.4100 / Fax 281.298.2868
DETCON, Inc.
3200 Research Forest Dr.,
Hwww.detcon.com
700 HART-RAM I.M.
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Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • H
700 HART-RAM I.M. ii
www.detcon.comH •
700 HART-RAM I.M.
Table of Contents
1. Introduction ..................................................................................................................................................1
1.1 Description.......................................................................................................................................... 1
1.2 Installation .......................................................................................................................................... 1
1.3 Field Wiring........................................................................................................................................ 3
2. Operator Interface.........................................................................................................................................5
3. Set-up and Normal Operation.......................................................................................................................7
3.1 View Sensor Status ............................................................................................................................. 7
3.2 Set AutoSpan Level ............................................................................................................................ 8
3.3 Set Serial ID........................................................................................................................................ 8
3.4 Set-up for Relay Outputs .................................................................................................................... 8
3.5 Signal Output Check ......................................................................................................................... 10
4. HART Interface ..........................................................................................................................................10
5. HART Operation ........................................................................................................................................11
6. HART Operator Interface...........................................................................................................................12
6.1 Device Menu..................................................................................................................................... 12
6.1.1 Primary Variables ......................................................................................................................... 12
6.1.2 Identification................................................................................................................................. 13
6.2 Diagnostics Menu ............................................................................................................................. 14
6.2.1 Device Status ................................................................................................................................15
6.2.2 Sensor Status ................................................................................................................................15
6.2.3 HART Status ................................................................................................................................16
6.3 Device Setup Menu........................................................................................................................... 16
6.3.1 Configuration Setup...................................................................................................................... 16
6.3.2 Calibration .................................................................................................................................... 18
6.3.3 HART Setup ................................................................................................................................. 22
7. HART-RAM Electronics Warranty............................................................................................................23
8. Specifications .............................................................................................................................................23
9. Spare Parts ..................................................................................................................................................24
10. Revision Log ..........................................................................................................................................24
Table of Figures
Figure 1 700 HART-RAM ................................................................................................................................... 1
Figure 2 HART-RAM Mounting ......................................................................................................................... 2
Figure 3 Mounting HART-RAM with 700 Sensor............................................................................................... 2
Figure 4 Exploded View of Assembly ................................................................................................................. 3
Figure 5 Interface connections on terminal board................................................................................................ 3
Figure 6 Installation with 700 Gas Sensor ........................................................................................................... 4
Figure 7 Remote 700 Gas Sensor with HART-RAM........................................................................................... 4
Figure 8 HART-RAM Software Flowchart.......................................................................................................... 6
Figure 9 Hart Interface Connection.................................................................................................................... 11
Figure 10 Primary Variables .............................................................................................................................. 12
Figure 11 Identification...................................................................................................................................... 14
Figure 12 Device Status Screen.......................................................................................................................... 15
Figure 13 FP Configuration Setup...................................................................................................................... 17
Figure 14 FP Calibration Screen ........................................................................................................................ 18
Figure 15 DVM Connection............................................................................................................................... 21
Figure 16 HART Setup....................................................................................................................................... 22
700 HART-RAM I.M. iii
700 HART-RAM I.M.
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Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • H
700 HART-RAM I.M. iv
www.detcon.comH •
700 HART-RAM I.M.
1. Introduction
1.1 Description
The Model 700 Remote Sensor/Alarm Relay Module with HART Interface (known as the HART Remote
Alarm Module or HART-RAM) is sold separately as an accessory for Model 700 Series Gas Sensors. It is a
universal design and can be used with any of the Model 700 Gas Sensors. The HART-RAM is provided in
an explosion-proof junction box constructed of either epoxy-painted aluminum or 316 stainless steel and
includes a glass-viewing window.
Figure 1 700 HART-RAM
The HART-RAM performs three functions: 1) The first function is to set gas alarm levels and to configure
the three local relay contacts. 2) The second function is to provide a HART Interface to the Model 700 Gas
Sensor 3) The third function is to operate a Model 700 Gas Sensor remotely. The remote sensor function is
typically used when the sensor must be mounted in a position where it cannot be viewed or accessed readily.
All three functions can be used at the same time.
1.2 Installation
The HART-RAM can be installed as a wall mount or pipe mount using the mounting holes of the explosionproof junction box. It should be oriented such that the LED display is horizontal. If the 700 Gas Sensor is
mounted directly to the HART-RAM, use 0.5” spacers underneath the mounting holes to provide access
clearance for the 700 Gas Sensor (Figure 3).
NOTE: Block any unused ¾” NPT holes with the proper Plug. (Detcon P/N 8522-750)
HART-RAM I.M. Rev. 0.0 Page 1 of 24
700 HART-RAM I.M.
5.825"
5.2"
Three - 3/4"NPT Fittings
Ø0.2750 x2
Mounting Holes
Explosion Proof Enclosure
5.5"
Junction-Box
Figure 2 HART-RAM Mounting
5.5"
5.2"
3/4" NPT x3
4.35"
4.35"
Bolt
Mounting
Wall (or other
mounting surface)
5.825"
Ø0.275 X2
Mounting Holes
Spacer
Bolt
Mounting
Explosion Proof Enclosure
Junction-Box
(Aluminun Junction-Box shown)
12.945"
7.76"
5.195"
Use Spacers to move
the J-Box and Sensor
detcon inc.
MODEL
XX-700
Sensor
2.115"
PGM2
SPAN
PGM1
ZERO
Assembly away from the
wall at least 0.25-0.5" to
allow access to Sensor
Sensor Assembly
PGM2
SPAN
Wall (or other
mounting surface)
Splash Guard
2"
Figure 3 Mounting HART-RAM with 700 Sensor
The HART-RAM Electronics package consists of three printed circuit assemblies (PCAs). The top two
PCAs (RAM display and HART Bridge) are accessed by removing the junction box cover and using the
brass pull knobs to pull the package directly out of the enclosure. The bottom PCA (terminal board) will
remain attached to the bottom of the junction box via two machine screws allowing the RAM display and
HART Bridge to unseat from the 12-pin plug-in connector and providing access to the terminal board
700 HART-RAM I.M. Rev. 0.0 Page 2 of 24
700 HART-RAM I.M.
connectors (Figure 5). To install the electronics package, properly align the plug-in connector and gently
push the HART-RAM in until it is fully seated to the bottom PCA. The HART-RAM faceplate will be even
with the top of the junction box when installed properly. The HART-RAM top should be flush with the top
of the enclosure before screwing down the junction box cover.
12-Pin Plug-In
Connector
External Wiring
The RAM display and
HART bridge
The terminal
board sets on
the stand-offs in
the enclosure
Input Port
6"
Input Port
Provide at least
a 6" Service
Loop for all
wiring
Figure 4 Exploded View of Assembly
1.3 Field Wiring
The field wiring connections are made to the bottom PCA (terminal board) of the HART-RAM using a series
of connector blocks. There is a 6-pin terminal block for connection to the 700 Gas Sensor (labeled
SENSOR), a 9-pin terminal block for connection to the 3 relay contacts (labeled RELAY OUTPUT), a 6-pin
terminal block for connection of power, mA/HART output and Modbus™ interface to the host device
(labeled IN) and a 6-pin terminal block for connection of power and Modbus™ interface to an additional
device (labeled OUT).
Alarm Relay
Connections
ALM1ALM2 FLT
NO NC COM NO NC COM NO NC COM
J7
Input Power and
mA/HART Output
Modbus
™
Interface to Host
K1
J2
+
mA
A
B+
IN
U1
K2
J1
+
AB
mA
SENSOR
J4
B
Modbus
A
Interface
K3
OUT
Output
Power
™
700 Sensor
Connections
Figure 5 Interface connections on terminal board
NOTE: The connectors on the HART Bridge are not to be used.
700 HART-RAM I.M. Rev. 0.0 Page 3 of 24
700 HART-RAM I.M.
The user will typically connect the 700 Gas Sensor directly to the HART-RAM if there is no requirement for
remote sensor separation (Figure 6). In this case, the 700 sensor will not require its own junction box and it
is not necessary to install/use the transient protection module shipped with the 700 sensor. The 700 sensor
may arrive from the factory pre-assembled with the HART-RAM in the j-box, but only if it is ordered in this
configuration. In this configuration, the wires from the 700 sensor will be directly connected to the 6-pin
terminal block labeled “SENSOR” on the terminal board.
NOTE: If the 700 sensor and HART-RAM are directly connected, it is not necessary to
install/use the transient protection module that is shipped with every 700 Gas Sensor.
Power Input
Fault
Annunciator
mA/HART Output
Modbus
™ Interface
Alarm 1
Annunciator
Alarm 2
Annunciator
detcon inc.
MODEL
XX-700
PGM2
PGM1
SPAN
ZERO
Sensor
Figure 6 Installation with 700 Gas Sensor
If remote sensor separation is required, the HART-RAM will be separated from the 700 sensor. Remote
separation distances of up to 1000 feet are possible with the recommended cables.
NOTE: It is highly recommended to install the interconnecting cabling inside rigid metal
conduit to eliminate potential EMI and RFI interference.
Power & Modbus
™
Power Input
mA/HART Output
Modbus™ Interface
Cabling to/from Remote
700 Series Sensor
Transient Protection
detcon inc.
MODEL
XX-700
PGM1
PGM2
SPAN
ZERO
Sensor
700 HART-RAM
Module in Detcon
standard J-Box
Module
Remote 700
Series Sensor
Figure 7 Remote 700 Gas Sensor with HART-RAM
700 HART-RAM I.M. Rev. 0.0 Page 4 of 24
700 HART-RAM I.M.
The recommended cable for remote sensor separation is Belden 1502P (18AWG unshielded pair for power
and 22AWG shielded twisted pair for serial Modbus™ communications). The mA signal return is not
required.
NOTE: Only the 2-wire power cable (mA signal return is not required) and the 2-wire
Modbus™ serial communications cable are required when remote wiring between the HARTRAM and the 700 Gas Sensor.
NOTE: The same recommended cables should be used for the connection between a
Modbus™ master control device and the HART-RAM. However, if only the 4-20mA/HART
signal is being used by the master/host controller, then Belden 8770 is recommended.
2. Operator Interface
The operator interface of the HART-RAM is very similar to the Model 700 Gas Sensor. It uses the identical
LED display, same programming magnet, and has the same magnetic programming switches (PGM1/ZERO
and PGM2/SPAN). The main difference is that the 700 HART-RAM has LED indicators for the 3 relays
(ALM1, ALM2 and FAULT) and a CAL LED to indicate when the 700 sensor is in calibration.
The gas reading, gas units, and fault status reported by the HART-RAM will mimic that of the 700 Gas
Sensor.
NOTE: If the Model 700 Gas Sensor is directly connected to the HART-RAM and junction
box, then the gas sensor operation should be exercised through the 700 Gas Sensor (and not the
HART-RAM). This is the recommended practice since the HART-RAM contains only a
limited number of sensor operational control functions. If the HART-RAM and 700 Gas
Sensor are separated, then normal remote gas sensor operation should be exercised through the
HART-RAM.
The operating interface is menu-driven via the two magnetic program switches located under the target
marks on the HART-RAM faceplate. The two switches are referred to as “PGM1” and “PGM2”. The menu
list consists of three major items that include sub-menus as indicated below. (Refer to the complete Software
Flow Chart Figure 8)
Normal Operation
Current Reading and Fault Status
Calibration Mode
AutoZero (if applicable)
AutoSpan
Program Mode
View Sensor Status (representative of whichever Model 700 Gas Sensor is attached)
Set AutoSpan Level
Set Serial ID
Alarm 1 Settings
Alarm 2 Settings
Fault Settings
Signal Output Check
700 HART-RAM I.M. Rev. 0.0 Page 5 of 24
700 HART-RAM I.M.
The user interface of the HART-RAM is designed to mimic that of the Model 700 Gas Sensor. However,
only the functions deemed critical for normal remote sensor operation are available. These are the 5 menu
functions that are available for the remote control of the 700 Gas Sensor:
AutoZero – used to perform AutoZero remotely
AutoSpan – used to perform AutoSpan remotely, user is required to apply span gas flow to remote gas
sensor
View Program Status – displays the complete list of sensor status and diagnostic indicators
Set AutoSpan Level – used to change the span gas concentration
Signal Output Check – used to generate simulated outputs from the sensor for system diagnostic purposes
NOTE: For any other required operational changes, the 700 Gas Sensor must be accessed
directly.
Software Flowchart
Normal Operation
PGM1 (3)
PGM2 (3)
View Sensor Status
Auto Time-Out
PGM1/2 (M)
PGM1/2 (3)
Version X.XX
Model Type
Range XXX ppm
Serial ID
AutoSpan @ XX
Last Cal XX Days
Sensor Life XXX%
Sensor Diags
mA Output = XX.XX
Voltage = X.XX V
Temp = XX C
Alarm 1 Settings
Alarm 2 Settings
Fault Settings
PGM1 (3)
PGM2 (3)
inc
inc
Yes
/No
Yes
/No
Yes
/No
Calibration Mode
(Auto Zero)
Calibration Mode
(Auto Span)
Set AutoSpan Level
AutoTime-out
PGM1/2 (M)
PGM1/2 (3)
XX
PGM2 (S)
PGM1 (S)
PGM1/2 (3)
Set Alarm 2
Auto Time-Out
PGM1/2 (M)
PGM1/2 (3)
Set Level - XX
PGM2 (S)
PGM1 (S)
PGM1/2 (3)
Set Ascending
PGM1/2 (S)
PGM1/2 (3)
Set Latching
PGM1/2 (S)
PGM1/2 (3)
Set Energized
PGM1/2 (S)
PGM1/2 (3)
dec
dec
inc
Yes
/No
Yes
/No
Set Serial ID
Auto Time-Out
PGM1/2 (M)
PGM1/2 (3)
XX
PGM2 (S)
PGM1 (S)
PGM1/2 (3)
Set Fault
Auto Time-Out
PGM1/2 (M)
PGM1/2 (3)
Set Latching
PGM1/2 (S)
PGM1/2 (3)
Set Energized
PGM1/2 (S)
PGM1/2 (3)
Set Alarm 1
Auto Time-Out
PGM1/2 (M)
PGM1/2 (3)
Set Level - XX
PGM2 (S)
PGM1 (S)
PGM1/2 (3)
Set Ascending
PGM1/2 (S)
PGM1/2 (3)
Set Latching
PGM1/2 (S)
PGM1/2 (3)
Set Energized
PGM1/2 (S)
PGM1/2 (3)
Signal Output Check
Auto Time-Out
PGM1/2 (M)
PGM2 (10)
Simulation
PGM1/2 (3)
dec
inc
Yes
/No
Yes
/No
Yes
/No
LEGEND:
PGM1 - Program Switch Location X1
PGM2 - Program Switch Location X2
(S) - Momentary Swipe
(M) - Momentary hold of Magnet during text
scroll until arrow prompt appears, then
release
(3) - 3 second hold from arrow prompt
(10) - 10 second hold from arrow prompt
Auto Time-out - 5 seconds
inc - Increase
dec - Decrease
X, XX, XXX - numeric values
dec
Figure 8 HART-RAM Software Flowchart
700 HART-RAM I.M. Rev. 0.0 Page 6 of 24
700 HART-RAM I.M.
3. Set-up and Normal Operation
In normal operation, the HART-RAM display continuously shows the current sensor reading, which will
typically appear as “ 0 ”. Once every 1 minute the LED display will flash the sensor’s measurement units
and gas type (i.e. % LEL). If the 700 Gas Sensor or HART-RAM is actively experiencing any diagnostic
faults, a “Fault Detected” message will flash on the display once every minute. When the unit is in “Fault
Detected” mode with the red Fault LED on, PGM1 or PGM2 can be swiped to invoke a display of the active
faults.
In normal operation, the 4-20mA current output from the HART-RAM corresponds with the present gas
concentration and full-scale range. The HART interface output, which is on the same wire as the 4-20mA
output, provides the current gas reading, fault status and other sensor status on a continuous basis when
polled.
If the Modbus™ communication between the HART-RAM and the 700 Gas Sensor is not functioning the
HART-RAM will display “COMM” and the ‘FLT’ LED will be illuminated.
NOTE: The 700 Gas Sensor must be set to Serial ID = 01 for proper communications set-up
with the HART-RAM.
3.1 View Sensor Status
View Sensor Status displays all current configurational and operational parameters from the 700 Gas Sensor
attached to it. These typically include sensor type, software version number, detection range, AutoSpan
level, days since last AutoSpan, estimated remaining sensor life, sensor diagnostics, input voltage, 4-20mA
output, and sensor ambient temperature.
To access the View Sensor Status menu, hold the magnet over PGM2 (ª) until the arrow prompt appears
and then hold continuously for 3 seconds. This will display the View Sensor Status text scroll. From the
View Sensor Status text scroll, hold the magnet over PGM1 (©) or PGM2 (ª) until the arrow prompt
appears and then hold continuously for an additional 3 seconds. The display will scroll the complete list of
sensor status parameters sequentially:
Current Software Version (of the HART-RAM)
Sensor Model Type
Range of Detection
Serial ID address
AutoSpan Level
Days From Last AutoSpan
Remaining Sensor Life
Sensor Diagnostics (varies by sensor type)
4-20mA Output
Input Voltage Supply
Operating Temperature
Alarm 1 Settings
Alarm 2 Settings
Fault Settings
When the sensor status list sequence is complete, the HART-RAM will revert to the “View Sensor Status”
text scroll. The user can then choose to either: 1) review list again by executing another 3 second hold, 2)
move to another menu item by executing a momentary hold, or 3) return to Normal Operation via 5 second
automatic timeout.
700 HART-RAM I.M. Rev. 0.0 Page 7 of 24
700 HART-RAM I.M.
3.2 Set AutoSpan Level
Set AutoSpan Level is used to set the span gas concentration level that is being used to calibrate the sensor.
This level is adjustable from 10% to 100% of range. The current setting can be viewed in View Sensor
Status.
The menu item appears as: “Set AutoSpan Level”
From the Set AutoSpan Level text scroll, hold the magnet over PGM1 (©) or PGM2 (ª) until the arrow
prompt appears and then hold continuously for an additional 3 seconds. The display will then switch to
“XX“ (where XX is the current gas level). Swipe the magnet momentarily over PGM2 to increase or PGM1
to decrease the AutoSpan Level until the correct level is displayed. Hold the magnet over PGM1 or PGM2
for 3 seconds to accept the new value. The display will scroll “AutoSpan Level Saved”, and revert to “Set
AutoSpan Level” text scroll.
The user can then choose to either: 1) move to another menu item by executing a momentary hold, or 2)
return to Normal Operation via 5 second automatic timeout.
3.3 Set Serial ID
The HART-RAM can be polled via the Modbus™ interface. The HART-RAM Serial ID # should be set as a
slave device to a master polling device. The Serial ID # of the HART-RAM is independent of the Serial ID #
of the Model 700 Gas Sensor.
NOTE: The Serial ID # of the Model 700 Gas Sensor connected to the HART-RAM must be
set to ID = 01 for proper communication between the two devices.
Set Serial ID is used to set the Modbus™ serial ID address of the HART-RAM. It is adjustable from 01 to
127 in hexadecimal format (01-7F hex). The current serial ID can be viewed in View Sensor Status using the
instruction given in Section 3.1 View Sensor Status.
The menu item appears as: “Set Serial ID”
From the “Set Serial ID” text scroll, hold the programming magnet over PGM1 (©) or PGM2 (ª) until the
arrow prompt appears and then hold continuously for an additional 3 seconds. The display will then switch
to “XX“ (where XX is the current ID address). Swipe the magnet momentarily over PGM2 to increase or
PGM1 to decrease the hexadecimal number until the desired ID is displayed. Hold the magnet over PGM1
or PGM2 for 3 seconds to accept the new value. The display will scroll “New ID Saved”, and revert to “Set
Serial ID” text scroll.
The user can then choose to either: 1) move to another menu item by executing a momentary hold, or 2)
return to Normal Operation via 5 second automatic timeout.
3.4 Set-up for Relay Outputs
The user interface allows for the setting and configuration of the three relay contacts of the HART-RAM.
The three relays can be optionally configured as follows:
Alarm 1: 1) gas level, 2) ascending/descending, 3) latching/non-latching and 4) energized/de-energized
Alarm 2: 1) gas level, 2) ascending/descending, 3) latching/non-latching and 4) energized/de-energized
Fault: 1) latching/non-latching and 2) energized/de-energized
700 HART-RAM I.M. Rev. 0.0 Page 8 of 24
700 HART-RAM I.M.
The three menu items for relay output set-up are Alarm1 Settings, Alarm2 Settings, and Fault Settings.
They are used to set the gas alarm levels and relay status for ascending/descending, latching/non-latching,
and energized/de-energized. The gas concentration level for alarms can be set between 1-95% of the fullscale range of the 700 Gas Sensor. The current relay configurational settings can be viewed in View Sensor
Status menu.
Ascending/Descending - In ascending mode, the alarm will trigger when the gas concentration
detected is greater than or equal to the alarm set point. In descending mode, the alarm will trigger
when the gas concentration detected is lesser than or equal to the alarm set point.
Latching/Non-Latching - In latching mode, the relay remains active when the alarm status has
cleared. In non-latching mode, the relay is deactivated when the alarm status is cleared.
Energized/De-Energized - In energized mode, the normally open contact is closed if the alarm level
has not been reached. In non-energized mode, the normally open contact is open if the alarm level
has not been reached. Energized mode provides for fail-safe operation since a loss of power or cable
failure will cause the contact to be open.
The menu item appears as: “Alarm1 Settings”
From the “Alarm1 Settings” text scroll, hold the magnet over PGM1 (©) or PGM2 (ª) until the arrow
prompt appears and then hold continuously for an additional 3 seconds. The display will switch to “Set
Level“ followed by XX (where XX is the current set-point level). Swipe the magnet momentarily over
PGM2 to increase or PGM1 to decrease until the correct level is displayed. Hold the magnet over PGM1 or
PGM2 for 3 seconds to accept the new value. The menu will then scroll “Saved”.
The display will then scroll “Set Ascending” and show “Yes” or “No”. Use a swipe of PGM1 to select
choice (yes = ascending and no = descending). Use PGM1 for a 3 second hold to accept the selection. The
menu will then scroll “Saved”.
The display will then scroll “Set Latching” and then show “Yes” or “No”. Use a swipe of PGM1 to select
choice (yes = latching and no = non-latching). Use PGM1 for a 3 second hold to accept the selection. The
menu will then scroll “Saved”.
The display will then scroll “Set Energized” and then show “Yes” or “No”. Use a swipe of PGM1 to select
choice (yes = energized and no = non-energized). Then use PGM1 for a 3 second hold to accept the
selection. The menu will then scroll “Saved”.
At this point, configuration settings for Alarm1 are complete and the menu will shift back to “Alarm1
Settings”. The user can then choose to either: 1) move to another menu item by executing a momentary
hold at the end of the text scroll, or 2) return to Normal Operation via 5 second automatic timeout.
Follow the identical instructional sequence for the menu function “Alarm2 Settings”. The menu function for
“Fault Settings” is similar except that it does not have a selection for gas level and ascending/descending. It
only has choice selections for latching/non-latching and energized/de-energized).
NOTE: The Fault relay is typically set-up as energized so that it will change states during an
unexpected power loss.
NOTE: The relay contacts can be wired at the HART-RAM’s connector PCA for either
Normally Open or Normally Closed.
700 HART-RAM I.M. Rev. 0.0 Page 9 of 24
700 HART-RAM I.M.
3.5 Signal Output Check
Signal Output Check provides a simulated 4-20mA output. The simulation allows the user to conveniently
perform a functional system check of the entire safety system, and can be initiated at the HART-RAM. This
signal output simulation aids in performing troubleshooting of signal wiring problems.
This menu item appears as: “Signal Output Check”
.
From the “Signal Output Check” text scroll, hold the magnet over PGM1 (©) or PGM2 (ª) until the arrow
prompt appears and then hold continuously for an additional 3 seconds. Once initiated, the display will
continuously scroll “Simulation Active” until the function is stopped. During simulation mode, the 4-20mA
value will be increased from 4.0mA to 20.0mA (in 1% of range increments at a 1 second update rate) and
then decreased from 20.0mA to 4.0mA.
NOTE: Signal Output Check stays active indefinitely until the user stops the function. There
is no automatic timeout for this feature.
To end simulation mode, hold magnet over PGM1 or PGM2 for 3 seconds. The display will revert to the
“Signal Output Check” text scroll.
The user can then choose to either: 1) move to another menu item by executing a momentary hold, or 2)
return to Normal Operation via 5 second automatic timeout.
4. HART Interface
The HART-RAM module provides an interface for a Model 700 gas sensor to a HART-enabled Network.
HART technology is a master/slave protocol which allows a HART Master, such as a control system, to
monitor the operation of the HART-RAM, and the Model 700 sensor attached to it. The HART-RAM
functions as an intelligent HART Slave on the Network.
The HART-enabled host interfaces with the mA output of the HART-RAM which contains the HART signal.
Power is provided through the 6-pin terminal block (labeled IN) located on the terminal board. (Figure 9).
NOTE: The 4-20mA signal from the HART-RAM must be connected to a load resistor to
operate properly. If this signal is not terminated properly, the HART-RAM and the HART
Interface will fail to work properly. Normal termination is accomplished by connection to the
host device, which will have the correct load to terminate the signal properly.
700 HART-RAM I.M. Rev. 0.0 Page 10 of 24
700 HART-RAM I.M.
K1
+
ALM1ALM2 FLT
K2
AB
mA
J4
B
A
K3
OUT
SENSOR
Input Power and
mA/HART Output
Modbus
™
Interface to Host
NO NC COM NO NC COM NO NC COM
J7
J2
+
mA
A
B+
IN
U1
J1
Figure 9 Hart Interface Connection
5. HART Operation
When power is applied to the HART-RAM with the Model 700 sensor attached, the HART interface will go
through a boot up sequence that will last for approximately 30 seconds. During this time, the 4-20mA line
will be held at 1mA. After the boot up sequence the HART interface will enter normal operation, and
communication with the Host will begin. A red LED (D7) labeled “HART” on the HART Bridge PCA will
illuminate when the PCA is communicating with the HART Host.
The 4-20mA signal from the HART-RAM must be connected to a load resistor for HART communication to
operate properly. If this signal is not terminated properly, the HART-RAM and the HART Interface will fail
to work. Normal termination for the 4-20mA signal is accomplished by connection to a Host device, which
will have the correct load to terminate the signal properly.
If the HART-RAM senses a fault in the sensor, it will take the 4-20mA signal down to 1mA. This 1mA
signal will signify to the Host that a sensor fault has occurred, and the Host should, in turn, flag an error with
the associated sensor.
The HART-RAM communicates with the Model 700 sensor through the Modbus™. The HART-RAM reads
the appropriate Modbus™ register and creates the 4-20mA signal from the register reading. This allows the
HART-RAM complete control of the HART Communications. A red LED (D6) labeled “MODBUS” on the
HART Bridge PCA will blink when communication with the sensor occurs.
The HART interface has the ability to take the sensor into calibration. If the sensor is taken into calibration
via the HART interface, the HART Communication Protocol will inform the Host that the sensor is in
calibration mode, and will not set a fault. The 4-20mA signal will be set at 2mA. Starting a calibration using
the sensor interface and magnetic tool will also cause the 4-20mA to be set to 2mA.
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6. HART Operator Interface
The HART-RAM provides the ability to interface with the sensor via the HART Interface. The HART
interface Host can be a PC, a Laptop, or several handheld devices such as the Emerson 375 Field
Communicator. Although the displays on each device may be different and the menu names may change, the
information provided should be the same. The HART Interface consists of three basic Menus, each with a
subset of menus or screens:
Device Variables Menu
Primary Variables
Identification
Diagnostics Menu
Device Status
Sensor Status
Device Status Menu
Configuration Setup
Calibration
HART Setup
Note: The screen shots shown below are taken from the HART Communication Foundation SDC625
Reference Host. The user’s screen appearance may be different depending on the HART host used.
6.1 Device Menu
6.1.1 Primary Variables
The primary Variable Screen contains the basic information from the sensor and is broken into four basic
sections. None of these variables are changeable, and are directly read from the sensor.
Figure 10 Primary Variables
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700 HART-RAM I.M.
Primary Variables
• Concentration – the value of the gas concentration measured by the sensor. The units of
measurement (ppm, ppb, or %) are shown to the right of the concentration value. This is the HART
primary variable.
• Loop Current – the value of the output 4-20mA loop current
• PV %rnge – Primary variable percent of range
• EngUnits – the measurement units and gas type
Range Variables
• PV LRV – Primary variable lower range value (normally 0 for most sensors)
• PV URV – Primary variable upper range value, or the range of the sensor (i.e. 100ppm, 10ppm, 5%,
etc.)
Device Status
• Indicates the device has more status information available. If this icon is green, no additional status
information is available. If it is red, refer to Section 6.2 Diagnostics for more information.
Measured Values
• Concentration – the value of the gas concentration measured by the sensor. The units of
measurement (ppm, ppb, or %) are shown to the right of the concentration value
• Temperature – displayed in degrees Centigrade.
• PS Voltage – power supply voltage. Nominally 24VDC
PV – Graphic display
A graphic display of the sensor concentration reading may also be displayed in this screen. The graph will be
a graphic display of concentration verses time.
6.1.2 Identification
The Identification screen contains 4 sections that provide some basic HART information as well as some
additional sensor information. None of these variables are able to be changed in this screen, although some
of these variables may be changed elsewhere.
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700 HART-RAM I.M.
Figure 11 Identification
HART Tags
• Tag – Text that is associated with the field device installation. This text can be used by the user in
any way. A recommended use is a unique label that correlates to a field device label: a plant
drawing, or on a control system. This variable is also used as a type of data link layer address
handle.
• Long Tag – Functions exactly like the Tag except the size is larger (max 32 ISO Latin 1 characters).
Device Info.
• Manufacturer – Device manufacturer – “Detcon”
• Model – Device model – “700 Bridge”
• Dev id – Field Device Identification – Uniquely identifies the field device when combined with the
Manufacturer and Model. This variable cannot be modified by the user. Normally “1”.
Revisions
• Universal rev – Revision of the HART Communication Protocol (currently revision 7)
• Fld dev rev – Revision of the Field Device Specific Device Description
• Software rev – Revision of the software embedded in the HART-RAM
• Hardware rev – Revision of the hardware in the HART-RAM
Sensor Information
• Processor Firmware Version – Version of the firmware currently loaded in the Model 700 sensor.
6.2 Diagnostics Menu
The Diagnostics Menu contains two screens; 1) Device Status and 2) Channel Status. Both screens consist of
a list of possible device error or status conditions. Next to each status condition is a small icon .that will be
either green to display the normal status, or red to indicate an abnormal, changed, or a malfunction condition.
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700 HART-RAM I.M.
6.2.1 Device Status
Device Status contains one screen that shows the status of the sensor and the HART-RAM. The left side of
the screen (Device Status) displays the status of the HART-RAM, with icons that will display either green to
indicate normal condition, or red to indicate an error, a change, or a malfunction.
Figure 12 Device Status Screen
• Field device has malfunctioned due to a hardware error or failure
• A reset or self test of the field device has occurred, or power has been removed and reapplied
• Field device has more status available
• PV analog channel fixed
• PV analog channel saturated
• Process applied to the non-primary variable is outside the operating limits of the field device
• Process applied to the primary variable is outside the operating limits of the field device
6.2.2 Sensor Status
The Sensor Status section of the screen shows the status of the Model 700 sensor. Icons are used to display
the status of the sensor and display either green to indicate normal condition or red to indicate an error, a
change, or a malfunction.
• Global Fault – The Model 700 sensor has one or more faults.
• Auto span fault – 180 days or more has elapsed since the last successful AutoSpan
• Temperature fault – the detector is currently reporting an ambient temperature that is outside of the –
40C to +75C range
• Loop current fault – The sensor has detected a condition where the 4-20mA output loop is not
functional
• Input voltage fault – The sensor is currently receiving an input voltage that is outside of the 11.5-
28VDC range
• Memory fault – The detector has a failure in saving new data to memory
• Processor fault – The detector has an unrecoverable run-time error
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• Clearing Fault – The sensor reading failed to clear after removal of span gas during an AutoSpan
sequence
• Stability Fault – The sensor reading failed to attain a stable reading when span gas was applied
during an AutoSpan sequence
• Range Fault – Sensor fails the minimum signal change criteria during an AutoSpan sequence
• Sensor fault – The sensor cell has failed
• Zero Fault – the sensor drifts below –10% of full range
• Sensor Fault 2 – heater fault (TP-700), bridge fault (FP-700), or missing cell (DM-700). This status
is not used by the IR-700 or PI-700.
• Sensor in Calibration – The sensor is currently being calibrated
6.2.3 HART Status
The HART status section of the screen shows the status of the HART interface on the HART-RAM. Icons
next to each error description indicate if an error has occurred. A green icon indicates the error condition is
not present and a red icon indicates an error has occurred.
• Unique ID Not Set – The unique device ID for the HART-RAM has not been set. This ID is set at
the Detcon factory prior to shipping. If this error occurs, please contact Detcon technical support.
• DAC Zero Not Calibrated – The 4mA output of the HART-RAM has not been calibrated. Please see
Section 4.3.2.2 for calibration instructions
• DAC Span Not Calibrated – The 20mA output of the HART-RAM has not been calibrated. Please
see Section 4.3.2.2 for calibration instructions
• Modbus™ Communications Lost – The Model 700 sensor has failed to respond to more than 3
Modbus™ poll requests. This error condition can be reset using the “Reset Comm Lost Status”
button that appears when this error condition occurs
6.3 Device Setup Menu
The Device Status Menu consists of three sub menus that allow parameters within the HART-RAM, and
within the sensor to be changed or modified, and allows calibration of the sensor.
6.3.1 Configuration Setup
The Configuration Screen displays the configuration of the Model 700 sensor. There are no fields that can be
changed on this screen, these fields are read directly from the Model 700 sensor.
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700 HART-RAM I.M.
Figure 13 FP Configuration Setup
This screen will vary depending on the type of Model 700 sensor attached to the HART-RAM. The Range
Set up will display the Model Type of the sensor, followed by the PV LRV (Primary Variable Lower Range
Value) and the PV URV (Primary Variable Upper Range Value), and the Conc Units (Concentration Units),
the display may also show the Sensor Range. The Sensor Setup portion of the screen will display sensor
specific parameters:
DM
• Sensor Range
• Cell Bias
• Gain Code
• Raw Counts
• Sensor Life
FP
• Gas Factor
• Cal Factor
• Bridge Current
• Bridge Voltage
• Sensor Life
IR
• Gas Factor
• Active Counts
• Reference Counts
• Range Multiplier
• Sensor Life
PI
• Sensor Range
• Gain Code
• Raw Counts
• Zero Offset
• Sensor Life
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700 HART-RAM I.M.
TP
• Heater Power
• Heater Voltage
• Sensor Resistance
• Heater Current
• Sensor Life
Note: The values above are read when the HART-RAM boots up and are not updated in real-time.
6.3.2 Calibration
The Calibration screen displays the days since the last calibration, and the auto span level. This screen also
allows the user to calibrate the sensor by performing an Auto Zero Calibration and an Auto Span Calibration.
Calibration of the sensor using this feature also notifies the Host that the sensor is in calibration mode.
Figure 14 FP Calibration Screen
6.3.2.1 Sensor Calibration using the HART-RAM
Calibration of a sensor using the HART-RAM follows the same principle as calibrating the sensor via the
magnetic interface. Since most of the calibration information can be found in the associated sensors manual,
it is important to have the sensor manual on hand when performing sensor calibration.
Each sensor type has different criteria that need to be met before calibration of the sensor should be
performed. Refer to the appropriate sensor manual for specific information on gas to be used, flow rates,
interference gas, cross calibration gas, and other sensor specific criteria.
NOTE: The TP sensor does not perform an Auto Zero function. Although the menu may provide this
option, the test is invalid, and is not performed.
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Auto Zero
Auto Zero function is used to zero the sensor. Local ambient air can be used to zero most sensors as long as
there are no traces of target or interference gases. If this cannot be confirmed, then a zero air or N
used. N
must be used for zero calibration of O2 deficiency sensors.
2
should be
2
Material Requirements:
• Handheld Communicator or PC and interface for HART-RAM.
• Detcon PN 613-120000-700 Model 700 Splash Guard with integral Cal Port. -OR-
Detcon PN 943-000006-132 Threaded Calibration Adapter
• Detcon PN 942-001123-000 Zero Air cal gas (or use ambient air if no target gas is present).
• Detcon P/N 942-640023-100 Nitrogen 99.99%
NOTE: Refer to appropriate sensor manual for the specific information on zero gas.
For DM, IR, and PI sensors, the zero gas source may be zero air or N
, but must be pure N2 (99.99%) for O2
2
deficiency sensors.
For FP sensors, zero air should be used. Zero Air should have a normal background of 20.89% O
Nitrogen (N
) should not be used or errors may result.
2
. Pure
2
Auto Zero consists of entering “Autozero Cal” and following the menu-displayed instructions.
1. If applicable install the Calibration Adapter or Splash Guard Adapter with integral Cal Port.
2. If applicable connect zero gas to the cal port.
3. Select “Autozero Cal” from the Sensor Calibration section of the screen.
4. Upon entering Auto Zero Calibration the procedure will prompt to begin Auto Zero Calibration. If zero
gas is to be applied to the sensor, apply the gas.
NOTE: Upon entering calibration the 4-20mA signal drops to 2mA and is held at this level until the
program returns to normal operation.
5. The procedure will prompt to verify that no gas is present, and the sensor will perform Auto Zero.
NOTE: The sensor will scroll “Zero Cal . . . Setting Zero . . . Zero Saved” twice.
6. After successfully setting Zero Cal the sensor and the HART Interface will return to Automatic Mode.
7. Remove the zero gas and calibration adapter if applicable.
Auto Span
The Auto Span function is used to calibrate the sensor. Unless otherwise specified by the associated sensor
manual, span calibration is recommended at 50% of range.
Material Requirements:
• Handheld Communicator or PC and interface for HART-RAM.
• Detcon PN 613-120000-700 Model 700 Splash Guard with integral Cal Port. -OR-
Detcon PN 943-000006-132 Threaded Calibration Adapter
• Detcon Span Gas (See Detcon for Ordering Information). Recommended span gas is 50% of range with
target gas. Other suitable span gas sources containing the target gas in air or N
balance may be
2
acceptable.
NOTE: Refer to the appropriate sensor manual for information regarding Span Gas, flow rates, cross
interference, or other sensor specific criteria.
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Auto Span consists of entering “Autospan Cal” and following the display. The procedure will ask for the
application of span gas. The applied gas concentration must be equal to the Autospan gas level setting. The
factory default setting and recommendation for span gas concentration is normally 50% of range. If a span
gas containing the recommended concentration is not available, other concentrations may be used as long as
they fall between 5% and 100% of range. However, any alternate span gas concentration value must be set
in the “Auto Span Level” field before proceeding with “Autospan cal”.
CAUTION:
Verification that the calibration gas level setting matches the calibration span gas
concentration is required before executing “Autospan Cal”. These two numbers must be equal.
Refer to the appropriate sensor manual for more information.
1. If applicable install the Calibration Adapter or Splash Guard Adapter with integral Cal Port.
2. Verify that the Auto Span Level is equal to the calibration span gas concentration. If the Auto Span
Level is not equal to the Calibration span gas concentration, adjust the Auto Span Level.
3. Connect the Cal Gas to the sensor, but do not apply the gas.
4. Select “Autospan Cal” from the Sensor Calibration section of the screen.
NOTE: Upon entering calibration the 4-20mA signal drops to 2mA and is held at this level until the
program returns to normal operation.
5. Upon entering the procedure the procedure will prompt to begin Auto Span Calibration.
6. The procedure will prompt to apply span gas. Apply span gas from the attached cal gas cylinder and
respond to the prompt.
NOTE: The sensor reading will respond to the gas and will switch to displaying a flashing “XX”.
NOTE: Assuming acceptable sensor signal change, after 1 minute the reading will auto-adjust to the
programmed Auto Span level. During the next 30 seconds, the Auto Span sequence checks the sensor for
acceptable reading stability. If the sensor fails the stability check, the reading is re-adjusted back to the Auto
Span level and the cycle repeats until the stability check is passed. Up to three additional 30-second stability
check periods are allowed before the unit reports a “Stability Fault” twice and the sensor will return to
normal operation, aborting the Auto Span sequence. The sensor will continue to report a “Stability Fault”
and will not clear the fault until a successful Auto Span is completed.
NOTE: If the sensor passes the stability check, the sensor reports a series of messages:
“Span OK”
“Sensor Life XXX%”
“Remove Span Gas”
NOTE: When calibrating O2 deficiency sensors, there is no requirement to clear to <5% of range. The
sensor will return to normal operation immediately after span adjustment.
7. When the sensor passes calibration the procedure will prompt to remove the span gas. Unsuccessful
completion of the span calibration will create a Global Fault, and “Autospan Cal” will be aborted with a
change to the HART Sensor Status (refer to section 6.2.2 Sensor Status).
8. After successfully setting span cal the sensor and the HART Interface will return to Automatic Mode.
9. The Auto Span Calibration is complete
10. Remove the cal gas and calibration adapter if applicable.
NOTE 1: If the sensor fails the minimum signal change criteria, a “Range Fault” will be declared and a
“Fault Detected” message will be displayed alternately on the sensor with the current reading. The HART
Sensor Status will change to reflect a Range Fault.
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700 HART-RAM I.M.
NOTE 2: If the sensor fails the stability criteria, a “Stability Fault” will be declared and a “Fault Detected”
message will be displayed alternately on the sensor with the current reading. The HART Sensor Status will
change to reflect a Sensor Fault.
NOTE 3: If the sensor fails the clearing time criteria, a “Clearing Fault” will be declared and a “Fault
Detected” message will be displayed alternately on the sensor with the current reading. The HART Sensor
Status will change to reflect a Clearing Fault.
6.3.2.2 Loop Test Calibrate
The Calibration Screen contains a Loop Test Calibration section. This section displays the loop current
reading and allows the user to perform D/A trim and Loop Test. D/A trim is used to calibrate the 4mA and
20mA set points in the Digital/Analog converter. Loop test allows the user to set the mA output to any level
within range; this can be a good troubleshooting tool for line degradation. A DVM capable of reading
milliamps and a 100~250 Ohm resistor are required to perform D/A trim and/or Loop test.
+ 24V
GND (- 24V)
DVM GND
DVM +mA
100~250 Ohm Resistor
HART-RAM Terminal Board
NO NC COM NO NC COM NO NC COM
J7
HART
Connector
J2
+
mA
A
B+
IN
Figure 15 DVM Connection
J1
K1
+
ALM1ALM2 FLT
K2
AB
mA
SENSOR
J4
B
A
K3
OUT
D/A Trim
1) Select “D/A trim” from the Loop test Calibrate section of the screen.
2) The procedure will prompt to connect a meter: (Refer to Figure 15.)
a) Disconnect the wire from the HART Connectors mA/HART position.
b) Connect one end of a 100~250Ohm resistor to the mA/HART position of the HART Connector.
c) Connect the positive lead of a DVM set to measure milliamps to the other end of the resistor.
d) Connect the negative lead (-) of the DVM to the GND position of the connector.
3) The procedure will set the output to 4mA, and prompt for the DVM Reading. Input the reading and
select “OK”.
4) The HART-RAM will readjust the output for 4mA, and inquire if the reading is 4mA on the DVM
(select “YES” or “NO”).
5) If the reading on the DVM is 4mA, select “YES” and “OK” and the HART-RAM will continue on to
20mA. If the reading is not 4mA, select “NO” and “OK” and the procedure will re-run the 4mA
calibration (Step 3).
6) The procedure will set the output to 20mA, and prompt for the DVM Reading. Input the reading and
select “OK”.
7) The HART-RAM will readjust the output for 20mA, and inquire if the reading is 20mA on the DVM
(select “YES” or “NO”).
8) If the reading on the DVM is 20mA, Select “YES” and “OK”. If the reading is not 20mA, select “NO”
and “OK” and the procedure will re-run the 20mA calibration (Step 6).
9) When both the 4mA and the 20mA have been calibrated the procedure will return the HART-RAM to
automatic control.
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700 HART-RAM I.M.
Loop Test
1) Ensure that the DVM is connected as prescribed in Figure 15:
a) Disconnect the wire from the HART Connectors mA/HART position.
b) Connect one end of a 100~250Ohm resistor to the mA/HART position of the HART Connector.
c) Connect the positive lead of a DVM set to measure milliamps to the other end of the resistor.
d) Connect the negative lead (-) of the DVM to the GND position of the connector. (Figure 15)
2) Select “Loop test” from the Loop test Calibrate section of the screen.
3) The procedure will prompt for a setting (“4mA”, “20mA”, “Other”, and “End”).
4) Select one of the settings or “End” to exit.
5) If “Other” is selected, the procedure will prompt for a value. Only valid values will be accepted.
6) Select “OK”.
7) The HART-RAM will set the output for selected milliamp value.
8) Compare the reading on the DVM to the output displayed. Select “OK” when ready to continue
9) The procedure will return to Step 3. If “End” is selected, the HART-RAM will exit Loop test and return
to automatic control.
6.3.3 HART Setup
The HART Setup Screen allows parameters of the HART-RAM to be changed or modified. Changes made
on this screen will not be applied until power is cycled on the unit.
Figure 16 HART Setup
• Tag – Text that is associated with the field device installation. This text can be used by the user in
any way. A recommended use is a unique label that correlates to a field device label: a plant
drawing, or on a control system. This variable is also used as a type of data link layer address handle.
• Long Tag – Functions exactly like the Tag except the size is larger (max 32 ISO Latin 1 characters).
• Descriptor – Text that is associated with the field device. This text can be used by the user in any
way. There is no specific recommended use.
• Message – Text that is associated with the field device. This text can be used by the user in any way.
There is no specific recommended use.
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700 HART-RAM I.M.
• Date – Gregorian calendar date that is stored in the field device. This can be used by the user in any
way. There is no specific recommended use. Note: This field is not updated by the HART-RAM and
does not indicate the current date.
• Final asmbly num – Number that is used for identification purposes, and is associated with the
overall field device.
• Poll addr – This number is the address of the HART-RAM on a network and must be set to 0.
7. HART-RAM Electronics Warranty
Detcon Inc. warrants, under intended normal use, each new Model 700 HART-RAM module to be free from
defects in material and workmanship for a period of two years from the date of shipment to the original
purchaser. All warranties and service policies are FOB the Detcon facility located in The Woodlands, Texas.
Terms & Conditions:
¾ Shipping point is FOB the Detcon factory.
¾ Net payment is due within 30 days of invoice.
¾ Detcon, Inc. reserves the right to refund the original purchase price in lieu of HART-RAM
replacement.
8. Specifications
Inputs
Any Model 700 Gas Sensor
Outputs
4-20mA signal with HART Version 7
Relay Contacts - Three Form C contacts rated for 5A @ 30 VDC/250 VAC
RS-485 Modbus™ RTU
Input Voltage
11-30VDC
Power Consumption (excluding 700 Gas Sensor)
<1.5 Watts at 24VDC (Normal)
<2.5 Watts at 24VDC (Maximum)
Operating Temperature
-40°C to +75°C
Electrical Classification
Class 1, Division 1 Groups BCD
Class 1, Zone 1, Group IIC
Enclosure Classification
Nema 7 and Nema 4X
700 HART-RAM I.M. Rev. 0.0 Page 23 of 24
700 HART-RAM I.M.
9. Spare Parts
Part Number
500-005136-100 RAM Display PCA
500-005132-200 HART Bridge “Plug In” PCA
500-005134-100 HART-RAM Termination Board PCA
897-850901-010 Aluminum Condulet w/Glass Lens Cover
897-850901-316 SS Condulet w/Glass Lens Cover
8522-750 ¾” NPT Plug
960-202200-000 Condensation Prevention Packet
306-175705-100 6-Pin Connector
306-175708-000 9-Pin Connector
Spare Parts
10. Revision Log
Revision Date Changes Made Approved By
0.0 11/1/10 Original Release LBU
Shipping Address: 3200 A-1 Research Forest Dr., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: 888.367.4286, 281.367.4100 • Fax: 281.292.2860 • H
700 HART-RAM I.M. Rev. 0.0 Page 24 of 24
www.detcon.comH •
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