Sentry Sample Sentry II Low Pressure Instruction manual

Original Instructions
Installation, Operation
&Maintenance Manual
Sentry Sample Sentry II
Sample Conditioning Automation
S-SW-IOM-00269-20 05-21

2 Sentry Equipment Corp
Do not install, maintain, or operate this equipment without reading,
understanding, and following the appropriate Sentry Equipment Corp
instructions. Otherwise, injury, damage, or both may result.
Copyright
© 2019 by Sentry Equipment Corp. All rights reserved. All product and company names
are property of their respective owners. This document contains proprietary information.
No part of this document may be photocopied or reproduced without the prior written
consent of Sentry Equipment Corp.
Limit of Liability
Sentry Equipment Corp, its employees, agents, and the authors and contributors to this
document specically disclaim all liabilities and warranties, express or implied (including
warranties of merchantability and tness for a particular purpose), for the accuracy,
currency, completeness, and/or reliability of the information contained herein and/or
for the tness for any particular use and/or for the performance of any material and/or
equipment selected in whole or part with the user of/or in reliance upon information
contained herein. Selection of materials and/or equipment is at the sole risk of the user of
this publication.
Note
The information contained in this document is subject to change without notice.
Table of Contents
Safety Information ......................... 3
General Safety Precautions ................. 4
Specications .............................. 5
General Description ........................ 6
Operation.................................. 10
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Maintenance ............................... 27
Troubleshooting Guide ..................... 36
Spare Parts List............................. 37
Standard Warranty ......................... 39
Customer Support.......................... 40
Appendix A - MODBUS ..................... 41

Sentry Sample Sentry II 3
Safety Information
Please read the entire manual before attempting to unpack, set up, or operate this
product. Pay careful attention to all Warnings, Cautions, and Notes. Failure to do so could
result in serious personal injury and/or equipment damage.
Use of Hazard Information
If multiple hazards exist, the signal word corresponding to the greatest hazard shall be
used.
Denitions
DANGER indicates a hazardous situation
which, if not avoided, will result in death or
serious injury.
WARNING indicates a hazardous situation
which, if not avoided, could result in death or
serious injury.
CAUTION, used with the safety alert symbol,
indicates a hazardous situation which, if not
avoided, could result in minor or moderate
injury.
NOTICE is used to address practices not
related to personal injury.
ÂNOTE
Information that requires special emphasis.
ÂTIP
Alternate techniques or clarifying information.
SHALL:
This word is understood to be mandatory.
SHOULD:
This word is understood to be advisory.

4 Sentry Equipment Corp
General Safety Precautions
Product Selection, Installation, and Use
Improper selection, installation, or use can cause personal injury or property damage. It is solely
the responsibility of users, through their own analysis and testing, to select products suitable
for their specic application requirements, ensure they are properly maintained, and limit their
use to their intended purpose.
Follow proper local, state, and federal regulations for proper installation and operational
requirements.
Always use caution and common sense when working with any chemical. Read the product
label and Safety Data Sheets (SDS) carefully and follow the instructions exactly.
Potential Equipment Hazards
Hot surfaces! This equipment may have very hot surfaces. If an operator contacts a hot surface,
injury may occur. Use protective clothing to prevent injury. If other equipment comes in contact
with a hot surface, damage to the equipment may occur. Ensure the area around this equipment
is kept clear to prevent this damage from occurring.
High pressures! This equipment may contain uids at very high pressures. Prior to installing,
removing, or maintaining this equipment, ensure that the equipment is isolated from all
connecting piping, the equipment is depressurized, the contents have been drained, and the
equipment is cool.

Sentry Sample Sentry II 5
Specications
Specications are subject to change without notice.
Applications: Sentry® Sample Sentry®II
is designed to meet requirements for
representative sampling by maintaining
a constant ow rate with varying inlet
conditions.
Models:
Low Pressure Models (LP)
100–500 psi (6.9–35 bar) at 450°F (232°C)
High Pressure Models (HP)
500–3000 psi (35–207 bar) at 1000°F (540°C)
Flow Control:
Range: 0–1500 cc/min
Accuracy: ± 50 cc/min
Measurements:
Final Sample Temperature
Cooling Water Outlet Temperature
Inlet Temperature to Secondary Cooler
Inlet Sample Pressure
Analyzer Sample Pressure
Sample Flow Rate
Pressure Measurements:
Range: 0–3000 psi (0–207 bar)
Accuracy: ± 0.5%
Temperature Measurements:
Range: 32–250°F (0–121°C)
Accuracy: ± 1°F
Alarm Relay Contact Rating:
Max. operating voltage: 250 VAC
220 VDC
Max. switching capacity: 30 W, 62.5 VA
inductive
60 W, 125 VA
resistive
Communications:
Protocol: MODBUS®
Network: RS-485
Display:
Graphical Vacuum Fluorescent Display
Power:
Input Voltage: 100–240 VAC
Frequency Range: 50/60 Hz
Input Current: 1.5 A / 115 V
0.9 A / 230 V
Compressed Air:
Consumption : < 0.2 scfm
Pressure: 80 psi minimum (5.5 bar)
120 psi maximum (8.3 bar)
Dimensions:
With sink
14 in x 43 in (356 mm x 1092 mm)
Without sink
14 in x 36 in (356 mm x 914 mm)
Mounting:
Wall mount using four 3/8" bolts
Ambient Temperature:
0–50°C (32–122°F) RH 95% max.
non-condensing at 40°C (104°F) max.
Approximate Shipping Weight:
65 lb max (29 kg)

6 Sentry Equipment Corp
General Description
Flow control of water and steam sampling is important to help assure the quality of
the samples and repeatability of the analytical results. Constant ow in the sample line
minimizes the chance of modifying the chemistry of the samples of high purity water
through entrapment and/or release of soluble species from deposits in the system.
Sample inlet temperature and ow are easily controlled under constant conditions.
However, since sample pressures typically uctuate, maintaining a representative sample
can be dicult and labor intensive. The traditional manual sample conditioning system
can require constant adjustment during startup or as plant conditions change.
Sample Sentry II is designed to meet requirements for representative sampling by
maintaining a constant ow rate with varying inlet conditions. Automated ow control is
achieved by continuously monitoring the sample ow rate and controlling a motorized
pressure reduction valve (PRV). An actuated ball valve and solenoid valve controls the
ow path, allowing for automatic startup and shutdown of the system. Flow control is also
available in a manual mode, allowing the operator to control the system with a keypad
on the controller. Sensors allow the controller to monitor temperature, pressure, and ow
and shutdown the system when an alarm occurs. Programmable options in the controller
allow Sample Sentry II to conform to a variety of sampling applications.

Sentry Sample Sentry II 7
Figure 1. Typical P&ID of a Sample Sentry II System

8 Sentry Equipment Corp
Figure 2. P&ID of a Sample Sentry II system with Secondary Cooling

Sentry Sample Sentry II 9
Upon power being supplied to the Sample Sentry II, the unit enters its startup routine.
During Startup, always ensure that unit’s sample isolation valve is closed (located next
to customer connection 1 in Figure 1 and Figure 2). During this startup routine, the unit’s
revision date and a Sentry logo are displayed. See Figure 3. During the unit’s startup
routine, the fully open and fully closed position of the PRV is being located. After the PRV
positions are stored, the system returns the PRV to the home setting and enters Operation
screen in Manual mode. Refer to Figure 5. Any time that the Sample Sentry II power is
reset, the unit enters its startup routine.
Sample Sentry II has two modes of operation, Manual and Automatic. Automatic mode is
comprised of the following states: Start, Blowdown, Sample, and Stop.
Start is the rst state in Automatic mode. While in the Start state the valves V-1 and SV-2
are closed. The PRV should be in its home set point position. For older models, this home
set point is not customer adjustable and is set to zero. On new models, the PRV home
set point position can be customer adjustable between 0 and 100 percent (0 being fully
closed and 100 being fully open). The system continually monitors the inlet pressure at
PT-1 and compares it to a programmed Startup Pressure set point in the controller. When
the inlet pressure is greater than the Startup Pressure set point, the system advances to
the Blowdown state. If Blowdown is not enabled, the system goes to the Sample state.
When enabled, the Blowdown state initiates a controlled blowdown sequence by opening
V-1 and closing SV-2. Blowdown is designed to ush the sample line while preventing
ow to analyzers. The controller continually adjusts the PRV, maintaining a ow rate at
the programmed blowdown ow rate set point. By closing SV-2, sample ow to analyzers
is stopped and the entire sample ows to the grab sample. Sample Sentry II remains
in the Blowdown state until the blowdown timer expires. The blowdown timer is a
programmable set point in the controller.
ÂNOTE
Ensure sucient blowdown time and ow rate are obtained to remove debris from the sample
stream prior to sending sample to the analyzers.
After blowdown, Sample Sentry II advances to the Sample state. In the Sample state, SV-2
opens allowing ow to analyzers. The controller continually adjusts the PRV, maintaining
a ow rate at the programmed sample ow rate. The system remains in the Sample state
until one of the following conditions is met:
1. Low Flow
a. The PRV is full open.
b. The total ow rate falls below the shutdown ow rate set point.
2. Low Pressure
a. The pressure falls below the shutdown pressure set point.
When one of the above conditions is met, the system advances to the Stop state. In the
Stop state, the controller closes SV2, adjusts the PRV to its home set point, and then closes
V-1. After all three valves are in their respective positions, the system advances to the Start
state if automatic startup is enabled or Manual mode if disabled.

10 Sentry Equipment Corp
The position of the pressure reduction valve and state of the valves are graphically
displayed on the user interface. Temperature, pressure, and ow are also displayed. The
Modbus feature provides added advantages including remote monitoring and control
of the system. The capabilities of Modbus are further addressed in“Appendix A” on
page41.
Operation
To ensure the protection provided by this equipment is not impaired, this equipment must not
be installed or used in any manner other than that which is specied in this manual.
Description of Controls
Table 1 and Figure 3 describe controls on the Sample Sentry II controller.
Table 1. Control Descriptions
Description Function
MENU key From the operation screen when the unit is in Manual mode, pressing
the MENU key displays the password screen for the main menu. In
order to enter the menu screen you must enter the password 101
followed by the ENTER key. If a correct password is entered, the main
menu screen appears.
From an alarm screen, pressing the MENU key clears the alarm.
ENTER key From the operation screen, pressing the ENTER key toggles the
controller between the Automatic and Manual modes.
While navigating through the menu screens, pressing the ENTER key
selects the option indicated by the cursor (►).
ESC key From the operation screen, pressing the ESC key toggles the states
between Blowdown and Sample.
While in the menu screens, pressing the ESC key exits the current
screen. Any changes are automatically saved.
Arrow keys
▲
▼
While in Manual mode, pressing the arrow keys opens and closes the
PRV.
While navigating through the menu screens, use the arrow keys to
move the cursor to the option you want to choose.
While editing elds and timers, use the arrow keys to change the value
in the current eld.
Cursor
►
Indicates the cursor position on the menu screens.

Sentry Sample Sentry II 11
Figure 3. Controller Front Panel

12 Sentry Equipment Corp
Screen Descriptions
Figure 4 shows the screen structure in the Sample Sentry II controller.
Figure 4. Screen Navigation
Operaon Screen
Main Menu
Setu
pA
nalog Inputs Display
Flow Rates Blowdown Scale
Sample Auto Calibraon
Shutdown Manual Cal
Blowdown TimeComp.Error Offset
PressuresStartup Pressure Flow Meter Cal
Shutdown Pressure
PRV Sengs PRV Type
CleanPRV Start Posion
PRV Recalibrate
Alarms Outlet Temperature
Low Flow Alarm
Low Flow Hysteresis
Low Pressure Alarm
UnitsLow Pressure Hysteresis
Opons Inlet Pressure
Outlet Pressure
Modbus Inlet Temperature
Outlet Temperature
PIDCooling Temperature

Sentry Sample Sentry II 13
Operation Screen
The operation screen is the main screen on the Sample Sentry II. This screen contains
information indicating the status of the system. While in Manual mode, the system is
controlled from the operation screen.
Figure 5. Operation Screen
In let1500PSI
Bl owdown 1407
cc
0:27 :3
7min
SV 1SV2 PRV
Figure 5 shows a typical operation screen for the Sample Sentry II. The top line displays
temperature and pressure data. The screen periodically refreshes to show a dierent
measurement. Only measurements that are enabled are displayed.
Line 4 displays the state of the three valves. Figure 5 currently shows valve SV1 open, SV2
closed, and the PRV partially open. If the PRV display was completely lled in, it would
indicate that the PRV was fully closed.
Line 2 displays the state of the system, including the total ow rate. The 7 possible states
are Manual, Start, Blowdown, Sample, Stop, Remote, and Clean.
Manual: While in manual mode, the system can be controlled with the keypad on the
front of the controller. Pressing the MENU key displays the Main Menu password screen.
To place the system in Automatic mode, press the ENTER key. Pressing the ESC key toggles
valves V1 and SV2 between open and closed. Holding the ▲key opens the PRV, while
holding the ▼key closes the PRV.
Start: The controller waits in the Start state until the inlet pressure is greater than the
programmed startup pressure. The only key that is functional while in the Start state is the
ENTER key. Pressing the ENTER key returns the system to Manual mode.
Blowdown: Flow to analyzers is stopped by closing SV2, forcing the entire sample to ow
to the grab sample. When the system is in Blowdown, the time remaining in Blowdown is
displayed on line 3. Pressing the ENTER key returns the system to Manual mode. Pressing
the ESC key advances the system to Sample.
Sample: The controller opens SV2, allowing ow to analyzers. Pressing the ENTER key
returns the system to Manual mode. Pressing the ESC key returns the system to Blowdown.
Stop: The Stop state occurs when the total ow falls below a shutdown set point and the
PRV is full open or if the pressure is lower than the shutdown pressure set point. During
the Stop state V1 is closed, the PRV is adjusted to its set point, and SV2 is closed. After
these valves are adjusted, the controller advances to Start if automatic startup is enabled
or Manual if disabled.
Remote: Remote indicates the system is being controlled remotely with the MODBUS
communications port. While in the Remote mode, the controller enters the Blowdown and
Sample states as determined from remote commands. Pressing the ENTER key returns the
system to Manual mode.

14 Sentry Equipment Corp
Clean: When the self-clean feature is enabled, the controller periodically actuates the
Sentry VREL® valve in an attempt to free potential blockages. The cleaning cycle closes
the sample valve SV-2, opens the VREL valve 5 turns, closes the VREL valve 10 turns, opens
the VREL valve 10 turns, then closes the VREL valve 10 turns, SV-2 opens and the system
returns to automatic operation. This process takes approximately 50 seconds during which
your analysis will be o line. Either the MODBUS or alarm relays can be used to monitor
when the system is in a cleaning cycle.
Alarm Screen
Figure 6. Alarm Screen
Alarm
High Temperature
Tout =125 F
Figure 6 shows a typical alarm screen. Anytime an alarm condition occurs, the alarm
screen takes priority over the existing screen. The alarm screen ashs twice per second,
alerting the operator of the problem. After the alarm condition has cleared, pressing the
MENU button resets the alarm.
Resetting Alarms
High Temperature Alarm
A high temperature alarm occurs when the outlet temperature is greater then the high
temperature alarm setpoint. When this alarm occurs, valves SV1, SV2 and the VREL valve
close. The alarm condition cannot be reset until the outlet temperature falls below the
high temperature alarm setpoint. Pressing the Menu (Reset) button resets the alarm and
allows normal operation.
On newer models (11/16/11 and later) a couple of options have been added.
1. When in a high temperature alarm, the user can cool the Sample Sentry II down by
opening SV1 and opening the PRV. Press and hold the ESC button to open SV1. Release
the ESC button to close SV1.
2. To open the PRV while in high temperature alarm, hold the ESC button down and
press the Up and Down arrows to adjust the PRV. This allows ow to cool the Sample
Sentry II.
3. In the event that the high temperature setpoint was inadvertently set below your
desired high temperature setpoint and you are unable to clear the alarm, holding
the ESC button and pressing Enter adjusts the high temperature alarm setpoint to 5
degrees above the current outlet temperature. This allows you to reset the alarm and
use the menu screens to set the correct high temperature alarm setpoint.
Options 1 and 2 above should only be used once you have corrected the event that casued the
high temperature condition on the sample outlet. Failure to ensure proper cooling can result in
a situation where steam is being sent through the Sample Sentry II.

Sentry Sample Sentry II 15
Motor Diagnostics
The Motor Diagnostics routine is performed by Sample Sentry II controller if a motor
movement signal is sent to the motor and no motor movement is detected. The“no motor
movement”condition can be caused by:
Locked PRV
Faulty motor encoder or motor
Faulty output board inside Sample Sentry II controller
Faulty power or signal wiring between Sample Sentry II controller and motor
If no motor movement is detected the Sample Sentry II displays a“Motor Diagnostics”
Message on the display and performs a motor diagnostics routine which is described
below:
1. SV-1 and SV-2 valves close.
2. Sample Sentry II pulses the motor in the opposite direction of the previous motor
direction movement. It performs this part of sequence for 15 seconds. If the motor
movement is detected Sample Sentry II displays“PRV Calibration” on the display and
performs PRV calibration where Sample Sentry II determines the number of turns in
the PRV. After PRV calibration has been performed, Sample Sentry II returns to sample
mode or manual mode depending on the state Sample Sentry II was in before Motor
Diagnostics routine.
3. If 15 seconds have elapsed and no motor movement has been detected, the Sample
Sentry II pulses the motor in the opposite direction for 15 seconds. If motor movement
is detected Sample Sentry II performs PRV calibration routine.
4. If 30 seconds has elapsed since motor diagnostics have started, Sample Sentry II
displays a“MOTOR ALARM” on the display. Pressing MENU key on the keypad clears
motor alarm and Sample Sentry II runs PRV Calibration routine.
If Sample Sentry II detects Motor Diagnostics routine 5 times within an hour it displays
a“PRV MAINTENANCE REQUIRED” warning in the display, which suggests that PRV is
getting locked and requires a check or maintenance.
Motor Alarm
A Motor Alarm occurs when Motor Diagnostics time has exceeded 30 seconds without
receiving conrmation that the PRV is moving. Typically, a motor alarms occurs because
debris becomes lodged in the PRV, or the PRV’s home position was set incorrectly. Follow
the below procedure to dislodge or clean any debris from the VREL valve.
Applying excessive torque on the PRV Shaft or PRV coupling will result in damage to the unit.
Follow the appropriate procedure when dislodging PRV.
1. Close the sample inlet isolation valve on the Sample Sentry II.
2. Remove power from the Sample Sentry II.

16 Sentry Equipment Corp
3. Remove and clean debris from VREL valve.
4. Verify VREL valve shaft opens and closes freely with little resistance.
5. Replace VREL valve (replacing VREL valve near the fully open position reduces startup
time).
6. Apply power to the Sample Sentry II.
7. Wait for Sample Sentry II unit to nish its startup routine (date screen will no longer be
shown).
Main Menu
Figure 7. Main Menu
Ma in Me nu
►Se tup
Analog Inpu ts
Disp lay
Figure 7 shows the main menu screen. The main menu is reached by pressing the MENU
key from the operation screen with the system in Manual. The cursor indicates the option
you wish to choose. Move the cursor by using the ▲and ▼keys. Select the option by
using the ENTER key. To exit this screen and return to the operation screen, press the ESC
key. The Main Menu password is 101.
Display Intensity
Figure 8. Display Intensity
Disp layIntensi ty
Leve l1-8
6
Figure 8 shows the Display Intensity screen. This screen allows the intensity of the
graphical display to be adjusted. To increase the intensity, use the ▲key. To decrease the
intensity, use the ▼key. The display setting is represented by a number between 1 and 8,
with 8 representing the brightest setting. Press the ESC key to save changes and return to
the main menu.
Setup
Figure 9. Setup Screen
Se tup
►Flow Ra tes
Blowdown Time
Mo re
Figure 9 shows the setup screen. The cursor indicates the option you wish to choose. Move
the cursor using the ▲and ▼keys. Select the option using the ENTER key. To exit this
screen and return to the main menu, press the ESC key.

Sentry Sample Sentry II 17
Flow Rates
Figure 10. Flow Rates
Flow Ra tes
Blowdown
1500 cc /min
Figure 10 shows the ow rates setup screen. The rst set point displayed is the blowdown
ow rate. To adjust the set point, use the ▲and ▼keys. To change the set point in counts
of 100, hold the MENU key while using the ▲and ▼keys. When nished changing the
displayed set point, press the ENTER key to display the next set point. After setting the last
ow rate, pressing ENTER returns the unit to the setup screen. The following ow rates can
be programmed:
Blowdown: This ow rate is used during the Blowdown state. During this time, the entire
sample ows to the grab sample, preventing ow to analyzers. This mode is designed to
ush the sample at a slightly higher ow rate than the sample state.
ÂNOTE
EPRI recommends a blowdown velocity no greater than 125% the normal sampling velocity.
Sample: This ow rate is used during the Sample state. During this time, sample is allowed
to ow to analyzers.
Shutdown: This ow rate setting is used to determine when the system should shut
down. When the total ow is less than this set point and the PRV is full open, the system
shuts down.
ÂNOTE
If the desire is for the system to never shut down, set the Shutdown ow rate to 0 cc/min, and
disable the Shutdown pressure setpoint.
Blowdown Time
Figure 11. Blowdown Time
Blowdown Time
hh :mm: ss
0:45 :00
Figure 11 shows the blowdown time setup screen. This setting controls the duration the
system stays in blowdown after startup. To change the seconds eld, use the ▲and ▼
keys. To change the minutes eld, hold the ENTER key while using the ▲and ▼keys. To
change the hours eld, hold the MENU key while using the ▲and ▼keys. To return to the
setup screen, press the ESC key.
ÂNOTE
To disable blowdown, set the blowdown time to 0:00:00.

18 Sentry Equipment Corp
Continued Setup
Figure 12. Continued Setup
Se tupCon tinued
►Star tupPressure
PRVSet tings
CleanMore
Figure 12 shows the continued setup screen. The cursor indicates the option you wish to
choose. Move the cursor using the ▲and ▼keys. Select the option using the ENTER key.
To exit this screen and return to the setup screen, press the ESC key.
Pressures
Figure 13. Startup Pressure
Star tupPressure
900 PS I
Figure 13 shows the pressures screen. To adjust the set-point, use the ▲and ▼keys.
Holding the MENU key while using the ▲and ▼keys changes the set-point in increments
of 100. When nished changing the displayed set point, press the ENTER key to display the
next set point. After setting the last pressure, pressing ENTER returns the unit to the setup
screen. The following pressures can be programmed:
Startup: The rst set point displayed is the startup pressure. This inlet pressure set point is
used to determine when Sample Sentry II should startup.
Shutdown: This pressure setting is used to determine when the system should shut down.
When the pressure is less than this set point, the system shuts down. To disable automatic
shutdown on low pressure, reduce the shutdown pressure until it reads“Disabled.”
ÂNOTE
Ensure that there is sucient pressure dierential between the startup pressure set point and
shutdown pressure setpoint so that the Sample Sentry II does not enter a continuous loop
senario. (ie. Startup pressure must always be sueciently higher than Shutdown pressure to
account for pressure drops during startups. )

Sentry Sample Sentry II 19
PRV Settings
Figure 14. PRV Setting
PRVSet tings
►PRVType
PRVStart Pos
PRVRecal ibrate
Figure 14 shows the PRV Settings screen. The cursor indicates the option you wish to
choose. Move the cursor using the ▲and ▼keys. Select the option using the ENTER key.
To exit this screen and return to the previous screen, press the ESC key.
Type: PRV type can be changed between VREL valve and Needle valve, depending on
the type of Sample Sentry II. Typically, this is factory set and should not be changed. The
access this setting, a password of 856 must be entered.
Figure 15. PRV Type
PRVType
VREL
Start Position: PRV start position is used as the position the PRV returns to when entering
and leaving automatic mode. It is also referred to as the home position or home setpoint.
The value can be changed between 0 and 100 percent, with 0 setting the position fully
closed. This can be set to higher if the sample line tends to have initial debris in the line
that can clog the VREL valve, or to reduce the time it takes for the sample to reach its
setpoint owrate. This is factory set to 10 percent and is typically not adjusted by the
customer. For older models, this setting is referred to as the home set point and is not
customer adjustable and set to zero.
Figure 16. PRV Start Position
PRVStart Pos.
10 Pe rcen t
Recalibrate: PRV recalibrate is used to reset the PRV limits. This should be done if there
are any manual (hand) adjustments done to the PRV, if there is a PRV replacement, or if
there is ever a motor alarm on the unit. For example, Recalibrate should be done if a VREL
valve is replaced after it has been taken o the Sample Sentry II for cleaning. Also, if the
coupling slips on the shaft of the PRV, a recalibration is required. For older models, this
setting is not available and resetting the PRV must be done by a reboot of the unit.
Figure 17. PRV Recalibrate
PRVRecal ibrate
En tertoRecal ibra
te

20 Sentry Equipment Corp
Clean
Figure 18. VREL Cleaning Frequency
Au to CleanFrequen
cy
dd :hh:mm
0:00 :00
Figure 18 shows the Auto Cleaning Frequency screen. This screen sets the frequency
between auto cleaning cycles for the VREL valve. When auto clean is enabled the
controller periodically actuates the VREL valve to prevent plugging. To change the minutes
eld, use the ▲ and ▼keys. To change the hours eld, hold the ENTER key while using
the ▲and ▼keys. To change the days eld, hold the MENU key while using the ▲and ▼
keys. To return to the continued setup screen, use the ESC key.
ÂNOTE
To disable auto cleaning, set the frequency to 0:00:00.
Continued Setup (Screen 2)
Figure 19. Continued Setup (Screen 2)
Se tupCon tinued
►Alarms MODBUS
Un itsPID
Op tions
Figure 19 shows the second continued setup screen. The cursor indicates the option you
wish to choose. Move the cursor using the ▲and ▼keys. Select the option using the
ENTER key. To exit this screen and return to the previous screen, press the ESC key.
Alarm Setup
Figure 20. Alarm Setup
AlarmSetup
Ou tlet Temp erature
120 F
Figure 20 shows the alarm setup screen. Use the ▲and ▼keys to change the alarm
threshold. Use the ENTER key to advance to the next alarm point. After all alarm levels
are set, the screen automatically returns to the continued setup screen (screen 2). The
following alarm conditions can be set:
Outlet Temperature: High temperature alarm for the sample temperature to analyzers.
A high outlet temperature triggers a shutdown and sets the common alarm relay. On
later model units (11/16/11 or later) the high temperature setpoint can be changed when
in a high temperature alarm by holding the ESC button down and pressing the Enter
button. This sets the high temperature setpoint to 5 degrees above the current outlet