General Monitors S216A User manual

Model S216A
Three Relay Smart Sensor
for Hydrogen Sulfide
Gas Applications
The information and technical data disclosed
in this document may be used and
disseminated only for the purposes and to the
extent specifically authorized in writing by
General Monitors.
Instruction Manual 05/97
General Monitors reserves the right to
change published specifications and designs
without prior notice.
Part No. MANS216A
Revision C/05-97
Model S216AGeneral Monitors

Warranty Statement
General Monitors warrants the Model S216A
to be free from defects in workmanship or
material under normal use and service within
two (2) years from the date of shipment.
General Monitors will repair or replace
without charge any such equipment found to
be defective during the warranty period. Full
determination of the nature of, and
responsibility for, defective or damaged
equipment will be made by General Monitors’
personnel. Defective or damaged equipment
must be shipped prepaid to General Monitors’
plant or the representative from which
shipment was made. In all cases this
warranty is limited to the cost of the
equipment supplied by General Monitors.
The customer will assume all liability for the
misuse of this equipment by its employees or
other personnel. All warranties 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 General Monitors’
approval or which have been subjected to
neglect, accident, improper installation or
application, or on which the original
identification marks have been removed or
altered. Except for the express warranty
stated above, General Monitors disclaims all
warranties with regard to the products sold,
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 General
Monitors for damages including, but not
limited to, consequential damages arising out
of/or in connection with the use or
performance of the product.
Warnings
lHYDROGEN SULFIDE GAS IS AN
EXTREMELY TOXIC GAS, AND
EXPOSURE MAY RESULT IN A LOSS
OF CONSCIOUSNESS OR DEATH.
lThe Model S216A contains components
which can be damaged by static electricity.
Special care must be taken when wiring
the system to ensure that only the
connection points are touched.
lIMPORTANT: Each H2S
sensor is shipped with a red
plastic cap fitted over the
sensor head. Inside the cap is
a desiccant. DO NOT remove
this cap until you are ready to
power the system. SAVE this
cap and RE-CAP the sensor
i
Warranty & Warning General Monitors

anytime the system power is off
for more than an hour.

Warranty
Warnings
Table of Figures
1.0 Introduction
1.1 General Description
1.2 Features and Benefits
1.3 Applications
2.0 Sensor Assembly
2.1 Sensor Signal Processing
2.2 Power Supply
2.3 Control Electronics
3.0 Installation
3.1 Receipt of Equipment
3.2 Sensor Location Considerations
3.3 Installation Instructions
3.4 Terminal Connections
3.5 Applying Power
3.6 Maintaining the X/P Integrity
4.0 Operation
4.1 Mode Types
4.2 Calibration Check Mode
4.3 Calibration Mode
4.4 Calibration Equipment
4.5 Program Review Mode
4.6 Relay Options Mode
4.7 Digital Display Codes
4.8 Fault Codes & Their Remedies
5.0 Appendix
5.1 Specifications
5.1.1 System Specifications
5.1.2 Mechanical Specifications
5.1.3 Electrical Specifications
5.1.4 Environmental Specifications
5.2 Engineering Documentation
5.2.1 Termination Outline Drawings
5.2.2 Termination Drawing - CE Mark Units
5.3 Ordering Information
5.4 FMRC Approval
5.5 Calibration Schedule for Problem Environments
Page Number
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Model S216A Table of Contents

Table of Figures
Figure 1 MOS Sensor Diagram
Figure 2 Input Signal Circuit Flow Diagram
Figure 3 H2S Adsorption Diagram
Figure 4 Converter Electronics Flow Diagram
Figure 5 Control Electronics Flow Diagram
Figure 6 Overall and Mounting Dimensions
Figure 7 Conduit, Drain Loop, and Seal Drawing
Figure 8 Terminal Connections, TB1 and TB2
Figure 9 Relay Protection Circuits for DC Loads
Figure 10 Relay Protection Circuits for AC Loads
Figure 11 Terminal Block Operation Drawing
Figure 12 Wire Strip Length Diagram
Figure 13 4-20mA Output Signal Connection
Figure 14 Input Power Connections
Figure 15 GMI Logo and Display Window Drawing
Figure 16 Display Diagram, Different Modes
Figure 17 Display Diagram, Calibration Sequence
Figure 18 CAL Bottle & Ampoule Diagram
Figure 19 Hydrogen Sulfide Portable Purge Calibrator
Figure 20 Display Diagram, Energized/De-Energized
Figure 21 Display Diagram, Latching/Non-Latching
Figure 22 Display Diagram, Set Points
Figure 23 Block Diagram, Relay Options Mode
Figure 24 Termination Drawing, S216A
Figure 25 Outline and Dimensional Drawing, S216A
Figure 26 Termination Drawing, S216A - CE Mark Units
Calibration Schedule for Problem Environments
Page
Number
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iii
Table of Contents General Monitors

This chapter provides a general description,
some features & benefits and a partial
listing of applications for the Model S216A.
1.1 General Description
The Model S216A is a Three Relay Smart
Sensor assembly designed to detect the
presence of Hydrogen Sulfide gas. The
microprocessor-based electronics are
contained within an explosion-proof housing
and can process information at the sensor
site. A digital display provides gas
concentration levels and fault codes that can
be viewed through a window in the cover.
Relay contacts and an analog signal (4-
20mA) provide remote and/or discrete
indications of the sensor’s operation. The
Model S216A Hydrogen Sulfide Gas
Enhanced Smart Sensor Assembly is rated
explosion proof (NEMA 4x weather proof
rated enclosure) for use in Class I, Division
1, Group B, C, and D hazardous areas.
1.2 Features and Benefits
Microprocessor-Based Electronics:
monitors eight individual fault conditions,
processes input signals from the sensor and
provides outputs in the form of display code,
relay contact activation, and an analog
signal.
One Person, Single Point Calibration:
initiate the calibration sequence with a
magnet, apply the gas, and wait for the
display to indicate that the unit has
completed the calibration. No tools or
adjustments are required.
Digital Display: indicates gas
concentrations, fault codes, calibration cues,
and is used for selecting relay options.
4 to 20 mA Output: transmits fault, over
range, calibration, and gas concentration
levels to a remote display, computer or other
readout device.
Relay Contacts (3 SPDT): provides a
discrete connection for a Warn, Alarm and
Fault indication to activate hazard
prevention or safety control devices (such as
fans, vacuum pumps, ventilation equipment,
etc.).
Multiple Modes: Normal, Fault,
Warn/Alarm, Calibration Check,
Calibration, Program Review, Relay
Options. Each mode is discussed in more
detail in later sections of this manual.
1.3 Applications
This is a partial listing of applications for the
Model S216A:
lRefineries
lDrilling Platforms and Rigs
lGas and Oil Production Platforms
lMud-Logging Operations
lDesulfurization Facilities
lHeavy Water Nuclear Facilities
lWastewater Treatment Plants
lChemical and Petrochemical Plants
lWell Head Sites
lOil Recovery/Reinjection
1
Model S216A Introduction

2General Monitors

This chapter discusses signal processing, the
on board power supply and the control
electronics for the Model S216A.
2.1 Sensor Signal Processing
General Monitors uses a proprietary Metal
Oxide Semiconductor (MOS) film on the
sensor for detecting hydrogen sulfide (H2S)
gas. The MOS film is deposited onto a
substrate between two electrodes (figure 1).
With no gas present, the measured resistance
between these two electrodes is very high
(in the mega-ohms). As H2S adsorbs onto
the film, the resistance between the two
electrodes decreases (to kilo-ohms). This
decrease in resistance is logarithmically
proportional to the concentration of H2S that
is present.
figure 1
The change in resistance is converted to a
change in voltage and amplified by the input
circuit (figure 2). This amplified signal is
fed to an Analog to Digital (A/D) Converter,
converted to a digital signal and sent to the
microprocessor to be processed. The
process of H2S adsorbing onto the MOS film
is most effective at an elevated temperature.
On the outer edge of the substrate is a heater
ring. The temperature of this heater ring is
measured with a thermistor and kept
constant by a circuit located inside the body
of the sensor.
figure 2
As H2S adsorbs onto the film, electrons
move more freely from one electrode to the
other (figure 3). This is represented as a
decrease in resistance. The process of H2S
adsorbing onto the MOS film is completely
reversible. As the concentration of H2S
decreases (H2S desorbs), the resistance
between the electrodes will increase.
figure 3
2.2 Power Supply
The Model S216A operates from a +24VDC
(nominal) input. This unregulated source is
fed to a converter board that produces
regulated voltages (see figure 4). These
voltages are the source for operating all of
the circuitry on the control and the display
boards, and supplying the sensor with
power.
3
Model S216A Sensor Assembly

Power Supply (continued)
Terminal connections inside of the housing
have been provided for accepting the input
power.
figure 4
2.3 Control Electronics
The control electronics are centered around an
eight bit microprocessor (figure 5). The
Sensor Signal, the CAL Switch, the Memory
(EEPROM), and certain Fault conditions are
monitored as inputs. By processing these
inputs, the following outputs are generated:
4-20mA Output Signal, Relay Contact States,
Digital Display Indications, and Calibration
Values (EEPROM).
As the microprocessor (MPU) receives and
processes the inputs, it determines what value
is output to the display, the 4-20mA current
generator, and the state of the relay contacts.
When the CAL Switch is activated, the MPU
allows the user to choose between the
Calibration, Test Gas, or the Alarm & Warn
Set Points and Relay Option Selection Modes.
While the unit is in the Test Gas Mode, the
MPU will fix the 4-20mA output signal to
1.5mA. The optional 0mA output signal is
for the calibration mode only.
Calibration Mode: When the unit is placed
in this mode, the MPU will look at the signal
from the sensor and determine when to accept
the calibration value. This value is stored in
the EEPROM and is used to adjust the digital
potentiometer associated with the Input Amp-
lifier. During calibration the
microprocessor will output a 1.5mA analog
signal (0mA is optional).
Calibration Check Mode: In this mode,
the MPU will output the gas concentration
to the display. When the gas concentration
drops below 5% of full scale, the unit will
return to normal operation. The purpose of
this mode is to check the response of the
unit to a known level of gas and determine
if calibration is necessary, while the output
current remains at 1.5mA (0.0mA is
optional).
figure 5
4Sensor Assembly General Monitors

Control Electronics (continued)
Alarm & Warn Relay Option Selection
Mode: The discrete relay options that are
available for the Warn and Alarm relays are:
¤Energized or De-Energized
¤Latching or Non-Latching
¤Set Point
The Alarm & Warn Set Points can be
selected in increments of 5 parts per million
for 0 to 100ppm and 0 to 50ppm ranged
sensors and in increments of 2 parts per
million for 0 to 20ppm ranged sensors.
NOTE: Once the Warn & Alarm Set
Points and Relay Options have been
selected, the unit will revert to the
calibration sequence, and must be
calibrated.
Model S216A Sensor Assembly
5

6General Monitors

This chapter explains what to do upon
receipt of equipment, what sensor location
considerations need to be made, installation
instructions, terminal connections, initial
application of power and how to maintain
the explosion-proof integrity of the Model
S216A.
3.1 Receipt of Equipment
All equipment shipped by General Monitors
is packed in shock absorbing containers
which provide considerable protection
against physical damage. The contents
should be carefully removed and checked
against the packing slip. If any damage has
occurred or if there is any discrepancy in the
order, notify General Monitors as soon as
possible. All subsequent correspondence
with General Monitors must specify the
equipment part and serial numbers. Each
Model S216A is completely checked by the
factory. However, a complete check-out is
necessary upon initial installation and start
up to ensure system integrity.
3.2 Sensor Location Considera-
tions
There are no standard rules for sensor
placement since the optimum sensor
location is different for each application.
The customer must evaluate conditions at
the facility to make this determination.
Generally, the Model S216A Smart Sensor
should be easily accessible for calibration
checks. The sensor assembly should be
mounted pointing down to prevent water
build-up on the sensor head. The sensor
assembly should not be placed where it may
be coated by contaminating substances.
Although the Model S216A is RFI resistant,
it should not be mounted in close proximity
to radio transmitters or similar equipment.
Other considerations when placing sensors
should include:
lLocate the Model S216A where
prevailing air currents contain the
maximum concentration of gas.
lLocate the Model S216A near possible
sources of gas leaks.
lObserve the Model S216A’s temperature
specification and locate the unit away
from concentrated sources of heat.
lSensor Assemblies should be mounted in
an area that is as free from wind, dust,
water, shock, and vibration as possible.
See Appendix, section 5.1.4 for the
environmental specifications of the unit.
Sensors may be adversely affected by
prolonged exposure to certain materials.
Loss of sensitivity or corrosion may be
gradual if such materials are present in low
concentrations, or it may be rapid at high
concentrations. The more important
materials adversely affecting sensors are:
lSilicones (often contained in greases and
aerosols). Silicones do not chemically
attack the sensor, they coat it and reduce
or inhibit its response to H2S gas.
lHalides . . . compounds containing
fluorine, chlorine, bromine, or iodine.
lCaustic and acidic liquids and vapors.
The presence of poisons and contaminants in
an area does not necessarily preclude the use
of a Model S216A Enhanced Smart Sensor.
The feasibility of using a sensor in such
areas must be determined by an analysis of
the specific factors in each application and
General Monitors should be consulted
before attempting any such installation.
7
Model S216A Installation

Sensor Location Considerations (continued)
Sensors used in these areas usually require
more frequent calibration checks than normal,
and typically have a shorter life. In many
such applications the normal two year
warranty would not apply.
IMPORTANT: Each H2S sensor is shipped
with a red plastic cap fitted over the sensor
head. Inside the cap is a desiccant. DO NOT
remove this cap until you are ready to power
the system. SAVE the cap and RE-CAP the
sensor anytime the system power is off for
more than an hour.
CAUTION: General Monitors discourages
the painting of sensor assemblies. If the
sensor head is painted over, the gas will not
be able to diffuse into the sensor. If the
assembly cover is painted over, the digital
display cannot be read.
3.3 Installation Instructions
The overall and mounting dimensions for the
Model S216A (figure 6 & 25) should be used
when making installation determinations. A
complete list of the mechanical specifications
can be found in section 5.1.2.
figure 6
To prevent possible corrosion due to
moisture or condensation, it is
recommended that the conduit connected
to the Model S216A housing, be sealed or
contain a drain loop (figure 7).
figure 7
Each conduit run from a hazardous
location to a non-hazardous location
should be sealed so that gases, vapors,
and/or flames cannot pass beyond the seal.
The purpose of seals in a Class I hazardous
location is to prevent the passage of gases,
vapors, or flames from one electrical
installation to another through the conduit
system. It is not necessary to seal the
Model S216A housing to maintain its
explosion proof integrity, however, conduit
runs containing wires
attached to the Model
S216A’s relay contacts
must be sealed (see
section 5.4). Information
on Class I location seals
can be found in the NEC
handbook, Article 501-5.
Installation Instructions (continued)
8Installation General Monitors

NOTE: Acetic acid will cause damage to
metal components, metal hardware,
ceramic IC’s, etc. If damage results from
the use of a sealant that outgases acetic
acid (RTV silicone), the warranty will be
void.
Once correctly installed, the Model S216A
requires little or no maintenance other than
periodic calibration checks to ensure system
integrity. General Monitors recommends
that a schedule be established.
NOTE: The system’s full two year
warranty will be voided if customer
personnel or third parties damage the
system during repair attempts.
Sensor heads exposed to the elements may
require the accessory mounting threads to be
lubricated. Grease must not be used. As an
alternate, PTFE (teflon) tape may be used on
threads.
NOTE: Do not use any material or
substance on threads that contact the
sensor housing.
The removal of particulate matter from
sensor accessories may be done through the
use of an appropriate halogen-free solvent.
Water or ethanol are examples of suitable
solvents. The accessories should be
thoroughly dried, with compressed air if
necessary, before refitting to the sensor
body.
General Monitors recommends that the
complete system, including all alarm
circuitry, be tested at least annually.
Some typical items to check during
maintenance examinations are:
lThe sensor mounting, to see it is secure.
lThe cable connections for tightness and
possible damage.
lThe sensor screen, to see it is clear of oil,
water, dust or paint.
lAll sensor placements are up to date with
the layout of the plant (e.g.
modifications to the plant).
lThe complete system, to see it has a back
up supply for the full prescribed time.
3.4 Terminal Connections
The terminal blocks (TB) are located inside
of the housing and can by accessed by
removing the cover (figure 8 - CE Mark
units see figure 26 on page 31). TB1
contains the connections for Power, Reset,
and Output Signal. TB2 contains the
connections for the relay contacts. TB3
contains the four sensor connections, White
(W), Green (G), Black (B), and Red (R).
figure 8
TB1
position
Functio
n
14-20mA Output
2Reset Common
3Reset Switch
4Common (Ground)
5+24VDC Power
Model S216A Installation 9

Terminal Connections (continued)
The Alarm & Warn relay connections vary
according to their normal state. The tables
below indicate the correct normally open
(NO) and normally closed (NC) contacts:
Alarm Relay - Normally Energized:
TB2 position Relay Contact
1Normally Open
2Common
3Normally Closed
Alarm Relay - Normally De-Energized:
TB2 position Relay Contact
1Normally Closed
2Common
3Normally Open
Warn Relay - Normally Energized:
TB2 position Relay Contact
4Normally Open
5Common
6Normally Closed
Warn Relay - Normally De-Energized:
TB2 position Relay Contact
4Normally Closed
5Common
6Normally Open
Fault Relay - Normally Energized:
TB2 position Relay Contact
7Normally Open
8Common
9Normally Closed
The Fault Relay is always Normally
Energized and Non-Latching.
Inductive loads (bells, buzzers, relays, etc.) on
dry relay contacts must be clamped down
(figures 9 and 10). Unclamped inductive
loads can generate voltage spikes in excess of
1000 volts. Spikes of this magnitude may
cause false alarms and contact damage.
figure 9
figure 10
NOTE: Contact with PCB components
should be avoided to prevent damage by
static electricity. All wire connections
are made to the Terminal Blocks.
It is recommended that a three wire (red,
black, white) shielded cable be used for
making power and signal connections on
the Model S216A. See Appendix, section
5.4. The terminal block accepts 16 AWG
to 22 AWG stranded or solid wire. Each
wire should be stripped before wiring the
Model S216A Enhanced Smart Sensor.
Installation General Monitors
10

Terminal Connections (continued)
To connect wiring to the terminal block,
insert a screw driver into the orange tab and
press down (figure 11), opening the
terminal. Insert the wire into the terminal
and release the orange tab, clamping the
wire in the terminal.
figure 11
Check the connection by GENTLY tugging
the wire to ensure it is locked in. NOTE: 14
AWG wire can be used if it is carefully
stripped (see figure 12).
figure 12
A 4 to 20mA output signal is provided by
the Model S216A Hydrogen Sulfide Gas
Enhanced Smart Sensor and can be sent up
to 9000 feet (2740 meters) to a General
Monitors readout/relay display module,
industrial analog to digital converter,
computer based monitor, PLC, DCS, etc.
See the Appendix (section 5.1.3) for cable
length specifications. The 4 to 20mA signal
provides for a control room or other location
remote to the Model S216A to display
operation and alarm conditions. To connect
the 4 to 20mA output signal with another
unit, connect the white wire to TB1, position
1 (CE Mark units - TB4, position 1), labeled
4-20 mA OUT. For making output signal
connections to display devices, refer to the
specific manual for that device (figure 13).
figure 13
If a device other than a General Monitors
readout/relay display module is being used,
the commons, COM, of both systems must
be connected together. The Model S216A
Hydrogen Sulfide Gas Enhanced Smart
Sensor operates from a nominal supply of
+24 VDC. Primary DC power must be
provided by the customer unless one of the
following General Monitors Modules is
being used with the Model S216A:
lDT200 Readout/Relay Display Module
lDT210 Readout/Relay Display Module
with Power Supply & Relay Module
lDT230 Readout/Relay Display Module
lTA202A Trip Amplifier Module with a
PS002
Model S216A Installation
11

Terminal Connections (continued)
The following General Monitors Modules
provide power connections for the Model
S216A, but need a customer supplied DC
source:
lDT210 Readout/Relay Display Module
without Power Supply & Relay Module
lTA202A Trip Amplifier Module without a
PS002
Since the Model S216A is designed to operate
continuously, a power switch is not included,
in order to prevent accidental system shut-
down.
NOTE: Power must remain disconnected
until all other wiring connections have
been made.
The maximum distance between the Model
S216A and the power supply is 4500 feet
(1372 meters). See the Appendix (section
5.1.3) for cable length specifications. The
cable run should be as short as possible. To
connect +24VDC to the Model S216A,
connect the red wire to TB1, position 5 (CE
Mark units - TB4, position 2), labeled
+24VDC. Connect the black wire to TB1,
position 4 (CE Mark units - TB4, position 3),
labeled COM (figure 14).
3.5 Applying Power
Before applying power to the system for
the first time, all wiring connections should
be checked for correctness and the housing
cover replaced.
At the initial application of power, or after
a fault condition has been corrected, the
unit will indicate “SU” (Start-Up) before
entering the normal mode of operation.
General Monitors recommends that the
Model S216A be calibrated within the first
hour of operation after the initial
application of power and that a second
calibration be performed 24 hours after this
initial calibration. These two calibration
sequences should be performed with new
units and units that have been off of power
for more than a week. See Calibration
Mode, section 4.3 for more details.
figure 14
Installation General Monitors
12

3.6 Maintaining the X/P Integ-
rity
The Model S216A is rated explosion proof
for Class I, Division 1, Group B, C & D
hazardous locations. Some of the factors
that influence the explosion proof integrity
of the Model S216A housing are:
lStrength of the enclosure material
lThickness of the enclosure walls
lFlame path between housing and cover
lFlame path of threaded joints
The acceptable limits for explosion proof
housings being used in Class I hazardous
locations are defined in CSA Standard
C22.2 No.30-M1986.
Anytime the cover of the smart sensor
housing is removed or the cover bolts are
loosened, the flame path between the lid and
the housing is affected. If power is left on
while removing or loosening the cover bolts
on the Model S216A it will be necessary to
de-classify the area first.
When replacing the cover, the gap between
the lid and the housing should be less than
.0015 inch (.038mm). Make sure that the
flame path is clear of dirt and debris before
replacing the cover. This can be verified by
tightening the cover bolts to a torque setting
of 50 inch-pounds or by using a feeler gauge
to ensure the gap between the cover and the
housing is less than .0015 inch (.038mm).
There are four entry holes, one each on the
left and right sides and two on the bottom of
the Model S216A housing. Three of these
holes are dedicated for the sensor, the reset
switch and conduit. Each hole is tapped for
3/4 NPT threads. If a particular entry hole is
not used, it must be plugged during
operation in the field. The factory installs
aluminum housing plugs in the unused entry
holes, except one. A plastic cap plug is
placed into this hole and must be removed
before conduit can be attached to the
housing.
Each Model S216A will have the following
items placed in the remaining entry holes:
lA sensor, if present (if not, a red
plastic cap plug)
lA reset switch, if present (if not, an
aluminum housing plug)
lAn aluminum housing plug
The sensor, reset switch and aluminum
housing plug have seven threads. Each of
these components is screwed into the
housing using five to seven turns. If it
becomes necessary to replace one of these
components, the user must use five to seven
turns to ensure the explosion proof integrity
of the housing is maintained.
Model S216A Installation
13

General Monitors
14

This chapter discusses the following modes;
Calibration Check mode, Calibration mode,
Calibration equipment, Program review
mode, Relay Options, digital display codes,
fault codes and their remedies.
4.1 Mode Types
The Model S216A has three (3) operational
modes and four (4) user initiated modes.
The operational modes are entered
automatically when certain conditions are
met. The user initiated modes are entered
by activating a magnetic switch.
lNormal Mode: This operational mode
indicates little or no gas present at the
sensor site.
lFault Mode: This operational mode
indicates a malfunction or an incorrect
operation.
lWarn/Alarm Mode: This operational
mode indicates the gas concentration at
the sensor site exceeds the Warn and/or
Alarm set points.
lCalibration Check Mode: This user
initiated mode verifies the display
reading with a known concentration of
gas applied to the sensor.
lCalibration Mode: This user initiated
mode allows the Model S216A to be
field calibrated.
lProgram Review Mode: This user
initiated mode allows the selected relay
options to be viewed on the display.
lRelay Options Mode: This user
initiated mode allows the relay options to
be selected.
To activate the magnetic switch, place the
magnet over the GMI Logo on the cover of
the Model S216A and view the display
(figure 15).
figure 15
The display will sequence through the user
initiated modes (figure 16) while the magnet
is applied to the GMI Logo on the cover.
The Model S216A will enter the mode that
is displayed when the magnet is removed.
To enter the Calibration Check Mode,
remove the magnet when the
display indicates a flashing
pair of bars, - -.
To enter the Calibration
Mode, remove the magnet
when the display indicates a
flashing AC.
To enter the Program Review
Mode, remove the magnet
when the display indicates a
flashing Pr.
To enter the Relay Options
Mode, remove the magnet
when the display indicates a
flashing AL.
15
figure 16
Model S216A Operation