NEMA Retrofit
Instruction Manual Part Number T12022
Rev. 1
Sentry IT NEMA Retrofit
TABLE OF CONTENTS
1.
GENERAL ........................................................................................................................................................... 2
2. TOOLS NEEDED & HARDWARE INCLUDED .................................................................................................. 3
3. REPLACEMENT STEPS .................................................................................................................................... 4
4. APPENDICES ..................................................................................................................................................... 6
4.1 APPENDIX A: SPECIFICATIONS .................................................................................................................... 6
4.2 APPENDIX B: MODEL NUMBERS .................................................................................................................. 7
4.3 APPENDIX C: INSTALLATION DRAWINGS ................................................................................................... 8
4.4 APPENDIX C: LIMITED WARRANTY ............................................................................................................ 10
Sentry IT NEMA Retrofit
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1. General
The Sentry Gas Risk Management System was ahead of its time from the very beginning. Sentry was first to
have digital two-way communication between the controller and the sensor, first to offer multiplexing
capability to reduce installation costs, first to incorporate Modbus output to interface to plant-wide systems,
first to offer a browser based interface and more. However modern technology has resulted in smarter
sensors and greater demand for extensive data management and alarming. While that trustworthy controller
has been protecting your plant and personnel for many years, it is time to consider an upgrade.
The new Sentry IT Controller meets the needs of today’s demanding instrumentation and systems engineer,
providing such features as:
Simultaneous interface via analog 4-20 mA, RS-485 Modbus RTU, Relay contact and
PSG/SentryBus
Scalability with space to add additional I/O blocks to expand capability
Intuitive operator interface with the color touch panel display with menu-driven prompts to reduce
the learning curve
Multiple power options of AC, DC, or AC with DC backup
User configurable alarm logic including menu driven configuration and integral Commander Logic
to allow the user to develop comprehensive alarm logic schemes
Easy interface to plant-wide systems utilizing various protocols including Modbus TCP,
EtherNet/IP, Profibus, BACnet, LonWorks or more
Sierra Monitor offers Sentry NEMA systems to easily upgrade to a Sentry IT System, enhancing your gas safety
with modern technology. You get to keep your installed sensors and there is no need to run new wires. This
provides you with additional functionality not found in your current system including additional sensor capability
(while maintaining same compact design), Modbus communications, additional outputs and web browser
interface. The retrofit only takes a few simple tools and about an hour or two of time.
Sentry IT NEMA Retrofit
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2. Tools Needed & Hardware Included
Tools Needed:
1. Open Wrench
2.
1
/
2
Socket Wrench
3.
7
/
16
Nut Driver
4.
5
/
16
Nut Driver
5. Screwdriver
6. Small Flat Screwdriver
New Plastic Bag Hardware P00018 contains:
Part No. Description Quantity
61150 Screw Seal 10-32 x 1.25 SHMS SST x4
62011 Washer #10 Flat x4
63088 Standoff 10-32 x 9/16 5/16 Hex AL x4
61036 Screw 10-32 x 3/8 PHMS Blo x4
61048 Screw 10-32 x 3/8 PHMS Zinc x2
Sentry IT Retrofit Installation Preparation
Sentry IT NEMA Retrofit
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3. Replacement Steps
Follow the steps below to upgrade to the Sentry-IT NEMA Retrofit:
1. Remove items from the box: Front Panel, Rear Panel, Bracket and Instruction Manual.
2. Turn OFF Sentry power and unplug AC power cord.
3. Remove green connectors from PSG/SentryBus board on new front panel.
4. Open the latch at the Right side of the enclosure.
5. Open the door of the enclosure.
6. Disconnect the 3 wires from each sensor and connect to
the green connectors removed in step 3.
7. Disconnect the AC power.
8. Unscrew the 2 black screws on the hinge at the Left side
of the Sentry panel.
9. Remove 4 nuts at the Right side of the hinge panel. (use
5
/
16
nut driver)
10. Take the panel out of the enclosure.
11. Remove the hinge panel out of the enclosure.
12. Remove existing standoffs (x4), existing washers (x4), existing
screws (x4) at the Right side of the enclosure.
13. Insert screw 61150 SST (x4) on each hole from outside of the
enclosure, washer 62011(x4) from inside the enclosure, standoff
63088 (x4) from inside the enclosure. Make sure the screws are
tightened. (use screw driver and open wrench)
14. Remove the 2 Long Standoffs at the Left side panel. Retain these 2
Long Standoffs for later use. (use ½ socket wrench)
15. Put the Retrofit Rear Panel back to the enclosure and re-insert the
2 Long Standoffs on the left side.
16. Install screw zinc 61048 (x2) at the right side top and bottom of the
Right Rear panel.
17. Re-mount the black bracket 39229 with screw blo 61036 (x2) on top of the 2 Long Standoffs.
Step 6
Step 13
Sentry IT NEMA Retrofit
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18. Fasten the hinge of the new front panel to 4 bolts by using the nuts
previously removed from the original hinge.
19. Connect the 2 cable wires from the Front panel to the Rear panel:
a. Red wire – TB1-3
b. Black wire – TB1-6
20. The Small Blue shorter ribbon connector (Assembly Harness)
connects to the white connector on top of the Rear board at stack 1.
21. The long Blue ribbon connector (Assembly Harness) connects to the
white connector at stack 2 (IF APPLICABLE).
22. The Black ribbon connector is only used for 4-20mA output at the
top board.
23. Plug the connectors from step 6 back in to the terminal
block. (Make sure all connectors are hooked up with the
correct PSG (Power Signal Ground))
24. Re-connect the alarm reset switch wires on each side
and snap back to lock the switch to its original position.
25. Connect power cord:
a. Green color – Ground “G”
b. White color – Neutral “F3” (N)
c. Black color – “F2” (H)
26. Use Ty-Wrap to straighten all the wiring.
27. To close the Front panel, insert screw Blo 61036 (x4) at
the Left side panel (use screwdriver).
Turn ON power to activate.
Step 18
Step 27
Activated!
Sentry IT NEMA Retrofit
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4. APPENDICES
4.1 APPENDIX A: SPECIFICATIONS
Power:
AC Version: 120/240 VAC +/- 10%, 50/60 Hz
DC Version: 24VDC Nominal (18-30 VDC)
Power consumption: Controller 50W, Typical max system 200W
Battery Backup capability: External option
Environmental:
Operating Temperature: -14 to 131
o
F (-10 to 55
o
C) *
Check with factory for applications outside of 32 to 122
o
F
(0 to 50
o
C)
Storage Temperature: -4 to 140
o
F (-20 to 60
o
C)
Relative Humidity: 0-95% Non-condensing
Display:
Type: 5.7” color, backlit touch-screen
Environmental rating: NEMA 4
Views: Bar charts, text data screens, configuration screens
Other Indicators: Integral long-life, high-intensity LED lights for Safe, Warning, Alarm and
Trouble
Connectivity to external controls and systems:
Controller to Ethernet: Modbus TCP or AllenBradley Ethernet/IP (other protocols available)
Optional - Remote management: Web browser interface
Optional - Mass storage: Flash Drive via USB port
Connectivity to modules:
Channels: Up to 32 module addresses
Channel power: 24VDC
Communication:
Analog 4-20 mA: 2, 3, or 4-wire per ISA specifications
Modbus RTU (Sentry IT); RS-485 (half-duplex)
Baud: 38400 baud (adjustable 2400 – 38400)
Parity: None
Stop bit: 1
Data bits: 8
Flow control: None
SentryBus: Proprietary Power, Signal, Ground (PSG)
Binary Input: Supervised or Digital Input
Output:
4-20 mA: Variable retransmission 3-wire or 4-wire
Relay: Programmable, SPDT (multiples of 8)
Standard: 5 Amps
Optional: 8 Amps
Trouble: 5 Amps, Fail-safe
Enclosure:
Design: Wall-mount
Warranty:
Limited Warranty: 2 years
* Specifications subject to change without notice
Sentry IT NEMA Retrofit
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4.2 APPENDIX B: MODEL NUMBERS
How to order (note that the Sentry NEMA Retrofit kit can only have two stacks)
Model
Points/
Series
Enclosure Stacks Power HMI
5000 - XX - IT - X - W, X, Y, O -
X
XX - X
5000 Series - 08 - IT - 1 = STD NEMA 1 - 0 = None - A32 = AC 100/220 32/16/8ch - 0 = Modbus RTU
- 16 - IT - 2 = NEMA4 SS - 1 = Analog (16) - D00 = DC 24V - 1 = Sentry View (WebServer)
- 32 - IT - 3 = NEMA4X GRP - 2 = PSG (16) - D08 = DC 24V w/ 8Hr BBU - 3 = ModbusTCP/EtherNetIP/
- 4 = RACK Chassis - 3 = Modbus RTU (32) - D24 = DC 24V w/ 24Hr BBU BACnetIP
- 5 = 5383-00 Retrofit - 4 = RELAY (8A) (8) - 9 = Integrated Bridge (Custom)
- 6 = 5383-01 Retrofit - 5 = Analog Output (16)
- 9 = CUSTOM - 6 = Digital Input (8)
- 7 = Carrier Only (8)
Sentry IT NEMA Retrofit
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4.3 APPENDIX C: INSTALLATION DRAWINGS
Sentry IT Retrofit Installation
Sentry IT NEMA Retrofit
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Sentry IT Retrofit Installation (continued)
Sentry IT NEMA Retrofit
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4.4 APPENDIX C: LIMITED WARRANTY
SIERRA MONITOR CORPORATION warrants its products to be free from defects in workmanship or material
under normal use and service for two years after date of shipment. SMC will repair or replace without charge
any equipment found to be defective during the warranty period. Final determination of the nature and
responsibility for defective or damaged equipment will be made by SMC personnel.
All warranties hereunder are contingent upon proper use in the application for which the product was intended
and do not cover products which have been modified or repaired without SMC approval or which have been
subjected to accident, improper maintenance, installation or application, or on which original identification
marks have been removed or altered. This Limited Warranty also will not apply to interconnecting cables or
wires, consumables (i.e. calibration gases, batteries, sensors), nor to any damage resulting from battery
leakage.
In all cases SMC’s responsibility and liability under this warranty shall be limited to the cost of the equipment.
The purchaser must obtain shipping instructions for the prepaid return of any item under this warranty
provision and compliance with such instruction shall be a condition of this warranty.
Except for the express warranty stated above, SMC disclaims all warranties with regard to the products sold
hereunder including all implied warranties of merchantability and fitness and the express warranties stated
herein are in lieu of all obligations or liabilities on the part of SMC for damages including, but not limited to,
consequential damages arising out of/or in connection with the use or performance of the product.
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