Installation and Operation Manual

GG-EM
ENTRANCE MONITOR
Installation and Operation Manual
GG-EM
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Warning
Use this product only in the manner described in this manual.
If the equipment is used in a manner not specified by Calibration
Technologies, the protection provided by the equipment may be impaired.
This equipment should be installed by qualified personnel.
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Table of Contents
General description ......................................... 4
Installation........................................................ 4
Locating the entrance monitor .................... 4
Installation guidelines .................................. 4
Wiring ........................................................... 5
Operation .......................................................... 8
Sensor range label........................................ 8
Start-up......................................................... 8
Alarm setpoint.............................................. 8
Relay/Alarm test........................................... 8
Calibration mode.......................................... 9
Oxygen downscale-alarm mode................... 9
Status LEDs................................................... 9
Signal voltage testpoints............................... 9
Maintenance.................................................... 11
Specifications.................................................. 11
Gas/Range labels............................................. 12
Warranty.......................................................... 13
For technical support, contact:
Calibration Technologies
920 N Trade Winds Pkwy
Columbia, MO 65201
866-394-5861
Sales@ctiengineering.com
www.ctiengineering.com
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General Description
Powered by 24VDC, the Entrance Monitor GG-EM
terminates the gas sensor’s 4/20 mA signal, and retransmits the 4/20 mA signal to another analog input
device such as gas detection controller or plant PLC. If
no connection is made to the signal output terminal,
the unit will act as a stand-alone device. Multiple units
can be installed in series, providing flexible remote
viewing options.
The Entrance Monitor GG-EM is assembled into a
wall mounted enclosure designed for non-classified
locations. The gas sensor (not included) is installed at
the location where gas is to be detected, up to 1,500
feet from the readout via a three conductor cable.
The Entrance Monitor GG-EM provides continuous
real-time monitoring of the sensor. Gas concentrations
are indicated by the 10 segment LED bargraph display.
The status LED provides an at-a-glance status of
power, including an alarm or fault condition.
A calibration mode setting allows for sensor
maintenance and calibration without tripping the
relay. The onboard relay has a 10 second on/off time
delay to prevent unnecessary cycling during a fault or
alarm condition. The alarm setpoint is adjusted by a
ten position rotary switch on the display board.
Installation
Locating the Entrance Monitor GG-EM
The important consideration when installing the
Entrance Monitor GG-EM readout is that it must be
easily accessible for operating personnel.
Installation Guidelines:
• Mount on solid surface with minimal vibration
• Mount readout in a general-purpose location only.
Do not install in a hazardous environment.
• Mount readout away from electromagnetic
interference.
• Protect readout from physical damage.
• If mounting on a wall with studs, the mounting
screws should be screwed into the studs.
Figure 1:
Dimensions
GG-EM
Wiring
Electrical wiring must comply with all applicable codes.
Wiring Guidelines:
• Always use 3-conductor, insulated, stranded,
shielded copper cable for all sensor cables.
• Do not pull sensor wiring with AC power cables.
This can cause electrical interference.
• Be sure to land the shield conductors of the
sensor cables at the shield terminals of the sensor
connectors.
• Bonding between metallic conduit connections is
not automatic with the non-conductive enclosure.
Separate bonding must be provided.
• Use stranded, copper wire/cable with a minimum of
75°C rating (167°F).
• To maintain NEMA 4X / IP rating of the enclosure,
conduit fittings of the same rating or better must
be used.
DC Power:
Requires 24VDC, 125 mA (not including other
connected devices)
Sensor Wiring: 4/20 mA, 100 Ohm input impedance.
• Refer to sensor manual for cable recommendations
(typically 20/3 shielded cable (Belden #8772 or
equivalent)).
• Length of cable should not exceed 1,500 feet.
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Relay Wiring:
• AC wiring must be run in separate conduit from the
sensor cables.
• If a separate relay cable conduit hole is needed, do
not drill or punch hole on hinge side of enclosure
due to close proximity of cable connectors.
• The alarm relay has Form C dry contacts, and
is rated 10 A @ 240 VAC or 8 A @ 24 VDC. (dry
contacts require external power connection)
• The alarm relay is normally energized. It will deenergize to the alarm state upon sensor alarm, fault
or loss of power. (continuity between NC and C
upon sensor alarm, fault or loss of power)
• The alarm relay has a status LED to show the state
of the relay. During normal operation, the green
status LED is on, indicating the relay is energized.
Stand-Alone and Feed-Through Applications
The Entrance Monitor GG-EM terminates the gas
sensor’s 4/20 mA signal, and re-transmits the 4/20
mA signal to another analog input device such as gas
detection controller or plant PLC. If no connection is
made to the signal output terminal, the unit will act as
a stand-alone device.
Feed-through application wiring specifications:
• Maximum input impedance: 700 Ohms
• Cable recommendations: 20/3 shielded cable
(Belden #8772 or equivalent).
• Length of cable should not exceed 1,500 feet.
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To case (earth) ground of monitoring equipment
To ground terminal of power supply
To +24V terminal of power supply
To signal input of monitoring equipment
Figure 2: Wiring Diagram (Stand-Alone application)
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Figure 3: Wiring Diagram (Feed-Through application)
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Operation
Sensor Range Label
The Entrance Monitor GG-EM is shipped with various
range labels. If the range of the sensor is not the
default range of 0/100 ppm, select the proper range
label and affix it over the default label.
Start-up
Before applying power, make a final check of all wiring
for continuity, shorts, grounds, etc. It is usually best to
disconnect external alarms and other equipment from
the Entrance Monitor GG-EM until the initial start-up
procedures are completed.
Refer to sensor manual for proper warm-up time of
sensor prior to any sensor test.
Because sensors are normally located at a distance
from the main unit, the test time required and
accuracy of the response checks will be improved if
two people perform the start-up procedures and use
radio contact.
Start-Up Test:
1) One person exposes the sensor to calibration or
test gas.
2) The second person stays at the control unit to
determine that the sensor, when exposed to the gas,
causes appropriate alarm functions.
Alarm Setpoint
The Entrance Monitor GG-EM is has one adjustable
alarm setpoint. The 10-position rotary switch allows
for alarm setpoint adjustments in 10% increments.
Once the sensor signal has exceeded the alarm
setpoint, the alarm LED will light immediately, and
the alarm relay will set after a 10 second time delay.
Once the signal has decreased lower than the alarm
setpoint, the relay will clear after a 10 second time
delay. For oxygen alarm setpoint instructions, see
oxygen downscale-alarm mode section on following
page.
Relay/Alarm Test
The relay test function allows for testing of the relay
output function without gassing the sensor. To test the
relay, put unit into “calibration mode” (see below), and
turn the 10-position rotary switch to the “0” setting.
After the short time delay, the relay will “set” into
the alarm condition. To “clear” the relay, adjust the
setpoint to the intended alarm position.
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Calibration Mode
Status LED’s
Calibration mode allows for sensor calibration
and maintenance without causing external alarm
conditions. To activate calibration mode, slide the Cal
switch to the on position. To deactivate, slide switch
to off position. In calibration mode, the following
conditions apply:
The Entrance Monitor GG-EM is equipped with the
following status LEDs:
Gas Concentration Bargraph: The 10-segment yellow
LED bargraph will display the gas concentration in
10% increments. Use the tick-marks on the full-scale
range label to the left of the display to determine the
concentration.
Power: The green power LED will remain on solid to
indicate power
Alarm: The red alarm LED will flash once per second
during an alarm condition.
Fault: The red fault will light and remain on solid
in the event of a sensor fault condition. Since the
Entrance Monitor GG-EM is constantly monitoring
the sensor signal, any signal below 1 mA will be
considered a sensor fault.
Relay Status: (see page 10 for LED location) The green
relay LED will remain on solid, in the “clear” position,
during normal operation.
1. The green power LED will flash twice per second
2. The relay will remain locked in the clear, non-alarm
condition.
3. The analog output will remain locked at 4 mA.
Oxygen Downscale-Alarm Mode
The oxygen downscale mode provides downscale
alarming for oxygen level monitoring. To activate
downscale alarm mode, slide the O2 switch to the on
position.
When the unit is set to “downscale” alarm mode, there
are two custom settings. For 15-25% range: If the
rotary switch is set to position 1, then the setpoint is
11.2 mA (19.5%). For 0-25% range: If the rotary switch
is set to position 9, then setpoint is 16.48 mA (19.5%).
Signal Voltage Testpoints
There are two sets of signal testpoints for signal
verification and troubleshooting purposes. These
signals are measured in mVDC, and range from 40 to
200 mV. The SIG IN testpoints indicate the 4/20 mA
signal coming from the sensor. The SIG OUT testpoints
indicate the 4/20 mA signal being re-transmitted to
another control panel or PLC if used as a feed-through
device.
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Figure 4: Components and Operation
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Maintenance
Specifications
All gas detection systems should be calibrated with
certified calibration gas once every six months. At this
interval, all alarm functions and outputs should be
tested, verified and documented.
Power Requirements: 24 VDC, 125 mA (not including
other connected devices).
Dimensions: 6.4” high x 4.5” wide x 3” deep
Weight: 1 lb
Enclosure: Injection-molded NEMA 4X (IP66)
polycarbonate gasketed housing. Hinged lid with
(2) latching clasps. For non-classified areas. Rated
for outdoors and washdown locations. Anodized
aluminum mounting plate.
Temperature Range: -40°F to +122°F
Humidity Range: 0% to 100% condensing
Sensor Inputs: (1) 4/20 mA, 100 Ohm input impedance
Analog Output: 4/20 mA (max input impedance: 700
Ohms)
Relay Outputs: (1) SPDT relay, Form C dry contacts.
8 A @ 24 VDC or 10 A @ 240 VAC.
Wiring Connections: 3 conductor, shielded, stranded,
20 AWG cable (Belden 8772 or equivalent) up to 1500 ft
(for sensor and analog output wiring).
Terminal Block Plugs (Field Wiring):
26-16 AWG, torque 4.5 lbs-in.
Visual Status Indications: (1) Yellow 10-segment LED
bargraph gas concentration display. (1) Green power
LED. (1) Red alarm LED. (1) Red fault LED. (1) Green
relay status LED.
Certification:
ETL Listed: Confirms to UL 61010-1
Certified to CSA C22.2 No. 61010-1
If sensor span or zero cannot be adjusted, refer to
the sensor manual. The sensor may be approaching
its end of life and may need to be replaced. Keep an
operation log of all maintenance, calibrations and
alarm events.
To clean the controller, use a mild cleaning solution
and soft cloth.
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Gas/Range Labels included with unit
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Limited Warranty & Limitation of Liability
Calibration Technologies, Inc. (CTI) warrants this product to be free from defects in material and workmanship
under normal use and service for a period of two years, beginning on the date of shipment to the buyer. This
warranty extends only to the sale of new and unused products to the original buyer. CTI's warranty obligation
is limited, at CTI's option, to refund of the purchase price, repair, or replacement of a defective product that is
returned to a CTI authorized service center within the warranty period. In no event shall CTI's liability hereunder
exceed the purchase price actually paid by the buyer for the product.
This warranty does not include:
a) routine replacement of parts due to the normal wear and tear of the product arising from use;
b) any product which in CTI's opinion, has been misused, altered, neglected or damaged by accident or
abnormal conditions of operation, handling or use;
c) any damage or defects attributable to repair of the product by and person other than an authorized dealer or
contractor, or the installation of unapproved parts on the product
The obligations set forth in this warranty are conditional on:
a) proper storage, installation, calibration, use, maintenance and compliance with the product manual
instructions and any other applicable recommendations of CTI;
b) the buyer promptly notifying CTI of any defect and, if required, promptly making the product available for
correction. No goods shall be returned to CTI until receipt by the buyer of shipping instructions from CTI; and
c) the right of CTI to require that the buyer provide proof of purchase such as the original invoice, bill of sale or
packing slip to establish that the product is within the warranty period.
THE BUYER AGREES THAT THIS WARRANTY IS THE BUYER'S SOLE AND EXCLUSIVE REMEDY AND IS IN LIEU OF
ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTY
OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. CTI SHALL NOT BE LIABLE FOR ANY SPECIAL,
INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES OR LOSSES, INCLUDING LOSS OF DATA, WHETHER
ARISING FROM BREACH OF WARRANTY OR BASED ON CONTRACT, TORT OR RELIANCE OR ANY OTHER THEORY.
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GG-EM
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GG-EM-DOC1-0
20171107
ctiengineering.com
|
866-394-5861
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