Dwyer RSM User Manual

Bulletin P-3-RSM

Series RSM Room Status Monitor

Specifications - Installation and Operating Instructions

The Series RSM Room Status Monitor is designed for critical low

differential pressure applications that require stringent pressure
monitoring and alarming. The Series RSM can be configured to monitor
positive or negative pressure in protected environments and hospital
isolation rooms per CDC guidelines. The RSM is a complete system that
includes a backlit RGB LCD display with a graphic user interface which
enables access to pressure, security, calibration, and alarm setup. The
touch-screen displays menus that guide the user through setup, as well
as setting up password protection. Red and green LED's and a local
audible alarm (with time delay feature) alert personnel to system status.
The RSM has a NEMA 1 (IP20) rated fire retardant plastic for indoor
applications. True differential pressure is displayed with a resolution of

0.001 in w.c. The very low pressure capacitance is dead ended and
avoids the potential for cross contamination of the room and reference
space as well as eliminating drift that results from fouling of flow based
sensors, which by nature have a flow path connecting the protected and
reference spaces. Additionally, there are two levels of password
protection available as well as optional BACnet MSTP communication.

1.0 INTRODUCTION

Congratulations, and thank you for purchasing Dwyer Instruments’
Room Status Monitor (Series RSM). Its ease of operation and durable
construction will provide years of reliable service. While the Series RSM
is easy to operate, it is advisable to read this guide carefully before use.
It is designed to help you take full advantage of the function and
performance of the Series RSM.

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8

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ROOM STATUS MONITOR

SPECIFICATIONS
Service: Air or nonconductive, nonexplosive gases.
Accuracy: ±0.5% FS, ±0.25% FS (optional).
Temperature Limits: 32 to 120°F (0 to 50°C).
Humidity Limits: 5 to 95% Relative humidity (non-condensing).
Altitude: 6561 ft (2000 meters) max.
Thermal Effects: ±0.03% FS / °F (± 0.05% FS / °C).
Pressure Limits: 15 in w.c. (±3.7 kPa).
Supply Voltage:

Order Code A (24 VAC): 18 to 32 VAC, 50 to 60 Hz.
Order Code B (120 VAC): 85 to 265 VAC, 50 to 60 Hz.
Main supply voltage fluctuations up to 10%.

Power Consumption (Voltage output): 5 W.
Output Signal: Selectable 4 to 20 mA (2-wire), 0 to 5 VDC (3-wire), or

0 to 10 VDC (3-wire).

Loop Resistance (4 to 20 mA output): 0 to 510 Ω.
Electrical Connection: Removable terminal block.
Process Connection: Barbed fittings for 3/16˝ I.D. tubing.
Enclosure Rating: NEMA 1 (IP20) rated for indoor app lications.
Housing: Fire retardant plastic.
Mounting: Mount to standard double gang metal electrical box using 4x4˝

plaster ring adapter.

Dimensions: 8˝ H x 5.4˝ W x 1.8˝ D (20.3 H x 13.7 W x 4.1 D cm).
Weight: 1.5 lbs (680 g).
Communications: BACnet MSTP ASC optional.
Agency Approvals: CE, CSA (RSM only).

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TUBING HEADER PORT

SPEAKER

ALARM

ACKNOWLEDGE

BUTTON

A-285 REMOTE
ANNUNCIATOR

LED
INDICATORS

1.1 INTENDED USE

The Series RSM is designed to monitor critical air environments,
providing room static pressure indication, alarming, and communication
functions. The applications include:

1. Hospitals - patient isolation and protection rooms, operating suites,
intensive care and emergency rooms.

2. Pharmaceutical, semiconductor, precision, manufacturing and clean
rooms.

3. Laboratories - medical research and BSLs (Bio-Safety Labs),
radiation, toxic metals and chemicals.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

1.2 RSM FUNCTION

The Series RSM senses very low differential pressure using high accuracy
capacitive sensor technology. The pressure difference for these
applications is the difference in static pressure between a critical
environment room and its surrounding reference area (usually a hallway or
another room). Maintaining and monitoring a static room pressure
difference ensures that the critical environment room is either protected or
isolated from a surrounding environment. Protection strategy requires a net
positive room static pressure difference, while isolation requires a net
negative static pressure difference. The RSM can be programmed to
monitor either positive or negative room static pressure. The RSM low
pressure sensing technology is coupled with multifunctional alarming and
simple touch-screen user interface with password security protection. The
BACnet communication option allows the device to communicate with
other BACnet devices to allow the supervisory system to change
configuration setups and monitor alarms in an open network.

3.3 MOUNTING

CAUTION

(For 120/240 VAC Version Only): Do not open or remove RSM cover

(flathead screwdriver required) with input power applied unless performed
by a licensed electrician. “Hazardous Live” voltage is present at connector
J3 when power is applied. Please observe the warning symbol ( ) near
the J3 power connector.

The RSM is designed to be mounted on a standard double gang metal
electrical box using a 4˝ x 4˝ plaster ring adaptor. Remove the RSM cover
and mount the baseplate to the plaster ring adaptor using four 6-32, 1/2˝
long mounting screws. Note: The plaster ring external mounting face needs
to be positioned flush to recessed, relative to the surface of the wall. Also
note the orientation of the 4 mounting screws in the plaster ring, as the
plaster ring is rotated 90° from conventional mounting.

User Interface: LCD display 128 x 128 COG module, with custom RGB
LED backlight and custom 4-wire resistive touch screen.

RGB Backlight: The SRPM indicates the status of the room being
monitored using visual backlight color.

Color status:
Green — Room pressure is within alarm limits.
Yellow — Door is open (door input must be enabled).
Red — Room pressure is outside alarm limits and alarm delay period has
been exceeded.

Visual Feedback: LEDs, green for normal, red for alarm.

Audible Feedback: Buzzer will sound when pressure is out of range and

alarm delay has timed out. Volume can be adjusted between 1 to 4 in
relative sound levels up to the max level spec of the buzzer of 85 dB at 4˝.
Audible alarm can also be disabled.

Quick Room Mode Change: Sometimes the room needs to be changed
quickly from in use (Occupied) to out of use (No Isolation). This is
accomplished by using two levels of password protection. The Operator
level allows access to change room modes but no other changes. The
Supervisor Level allows full access to all menus. In No Isolation mode no
alarms are generated even if the pressure is outside limits. To change
modes press the Menu key, press Setup Room key and press No Isolation.

2.0 PARTS LIST

2.1 RSM INCLUDED PARTS

Quantity
1 RSM assembly
2 Barbed Coupling, Brass
2 1/4˝ Tube, Silicone, Inter-Connect
4 6-32 x 1/2” Mounting Screws for RSM Base

3.4 WIRING ELECTRICAL BOX (ROUGH IN)

Layout the system in terms of wiring: power, annunciator, analog output,
BACnet, relay output and plumbing to connect to the monitored spaces
(pressure taps). Bring all power, earth ground, signal communications and
analog output wiring into the 4˝ x 4˝ electrical box. In order to conform to
the CSA safety standard the electrical installer must comply with the
following ground earth instructions. Pre-wire electrical box with power (24
VAC or 120/240 VAC depending on RSM model), and provide grounding to
the electrical box and plaster ring adaptor. The safety ground path consists
of the four 6-32 x 1/2˝ metal screws that connect the RSM metal base to
the 4˝ x 4˝ metal plaster ring. The plaster ring is grounded to the 4˝ x 4˝
electrical box by 2 mounting screws. The 4˝ x 4˝ electrical box is grounded
to the building earth ground. It is also highly recommended to use armored
cable (Type AC) for all the wiring in applications where high levels of radio
interference may be present.

Power leads and wiring should be 14 to 22 AWG braided wire. 18 AWG
braided wire is recommended for wiring J3 power connector to RSM. For
120/240 VAC the hot wire connects to L and neutral to N (See Section

13.0). BACnet suggested wiring is 22 AWG stranded wire in a shielded
cable, a +, -, Gnd (S) and shield should be run. This can be two twisted
pairs with a separate cable shield. One twisted pair is used for
communications, the second twisted pair can be used for communications
ground and the shield wire can be connected to the other device shield
wires.

2.2 OPTIONAL A-285 INCLUDED PARTS

Quantity
1 Annunciator Assembly

3.0 MOUNTING AND WIRING

To mount and install properly, the following components are required:

3.1 NOT INCLUDED RSM PARTS

Quantity
1 Double Gang Metal Electrical Box with Grounding Stud
1 4˝ x 4˝ Metal Plaster Ring
1 Door Switch SPDT or SPST, N.O., as needed

3.2 NOT INCLUDED A-285 PARTS

Quantity
1 Single Gang Electrical Box

Note: In the following wiring sections, abbreviations are used (e.g. J1, P3).
Please see section 13.0 for complete wiring diagrams with abbreviations.

Mounting Screws [x 4]

3.5 ATTACHING PRESSURE TUBING

Typically a Room Pressure Snubber (RPS) is installed in the monitored
room.

NOTICE

overpressure from crimped or collapsed tubes.

Use the following procedure for all room types positive, negative or neutral:
Typically a Room Pressure Snubber (RPS) is installed in the monitored
room. Often stiff nylon 3/4˝ tubing is used for running pressure signals from
the SRPM to the monitored spaces. To prevent buckling and collapse of
this stiff tubing inside the electrical box, use the supplied soft silicone
tubing and tubing adapters to transition from the field tubing to the pressure
fittings on the RSM. Attach pressure tubing as follows:

1. Connect the 1/4˝ O. D. tubing from the RPS to the 4˝ x 4˝ electrical box

for the RSM by pushing the 1/4˝ tube onto one end of the barbed, male to
male, tube adaptor, then push the silicone tube (supplied) onto the other
end. Thread the tubes, with installed adaptor, through the conduit opening
at the bottom of the electrical box.

Always attach tubing to the RSM header and then
place Header onto RSM. This will prevent

4.2 AUDIBLE ALARM

Alarm potentiometer can adjust from 0 to 85 dB. Using a screwdriver, rotate
potentiometer (on A-285 remote annunciator PC board) clockwise to
increase volume and counterclockwise to decrease volume.

Audible Alarm
Potentiometer

2. Next push the open end of the silicone tubing onto the RSM pressure

tube header (H1) port labeled “+”. Note: The header is an Electro­Pneumatic (EP) assembly. “+” indicates (Positive) pressure, and “-”
indicates negative or reference pressure.

3. For the most pressure stable operation, an RPS installed in the

reference pressure area is also recommended. In this case, install the RPS
in a hallway or anteroom. Attach the tube to the RSM in the same way as
in step 2, except attach the tube to the “-” port on the pressure tube header.
Tighten swivel fittings on the assembly if they become loose.

4.0 ALARM RELAY OUTPUT

The Single Pole Double Throw (SPDT) relay output can be used for remote
signaling of alarm condition. A form “C” contact rated at 1A is available.
Connect to J4, P1 and P4 (See Section 13.0).

4.1 OPTIONAL REMOTE ANNUNCIATOR WIRING

Dwyer offers an optional Remote Annunciator (Model A-285). In the figure

below, the remote annunciator connector is at left, and the RSM connector
is at right: Connect P1 to P2, then connect P2 to A1 (Located on Remote
Annunciator), finally connect P3 to A2 and P4 to A3.

5.0 DOOR STATUS SWITCH WIRING

5.1 WIRING

Install the door switch into the door jamb. Wire to the normally open (N.O.)
side of the door jamb contact switch. The SRPM will indicate the status of
door position. A contact closure indicates that the door is closed. This is a
low voltage circuit (5 VDC). Run two wires from the door switch to
connector J6 on the SRPM. The door input status function is enabled in the
ALARM SETUP SCREEN, section 7.5.

6.0 ELECTRICAL INSTALLATION

6.1 ANALOG OUTPUT

The RSM can be configured to have current (4 to 20 mA) or voltage (0 to
5 or 0 to 10 VDC) outputs. Voltage output--pin 1, Current output--pin 2,
Common--pin 3. Note: No external excitation is required.

Current Output

Voltage Output

6.2 BACnet Communication

BACnet hardware is implemented as isolated RS485. Wire to Connector
J2, labeled RS-485. Connect tx line to +(A), rx to -(B) and ground wires to
S. Connect Shields together with wire nut. Hardware configuration is done
using a 5 position dip switch located in the upper right hand section of the
PCBA as well as through the touch screen interface.

Position Function

1

MAC address enable

2

N/C Not Connected

3

Pull Up Resistor

4

Termination Resistor

5

Pull Down Resistor

Use a small flat blade screwdriver or pen to push the switch to the right to
turn that function on, otherwise it is off. There is a BACnet setup screen
that is enabled by pushing position 1 switch to the on position. After
configuration the switch must be moved to the off position.

7.0 STARTUP AND OPERATION

The RSM is designed with an easy to use touch screen interface. In its
normal state the Monitoring Screen displays the actual room static
pressure. The buttons at the bottom of the screen give you access to the
functions that can be performed.

7.0.1. MENU TREE

See section 14.0.

7.1 POWER-UP

Apply power to the RSM and observe the welcome screen and subsequent
transition to the pressure monitor screen. The actual room static pressure
is shown as a number on the LCD and visually as a moving bar indicator
operating between the preset alarm units. The vertical bar is an indicator of
the pressure.

Description

Button

Shuts off Alarm

Silence

Access to Setup Functions

Menu

Resets the unit in “Latched” mode.

Reset

7.3.1 SETUP UNIT OPERATION

Press (or tap) button to select an output or engineering unit. Selected
button background will change from clear to black.

7.3.2 ENTERING DATA

Press (or tap) button to select an output or engineering unit. Selected
button background will change from clear to black.

7.3.2.1 PASSWORD PROTECTION

Lightly pressing (or tapping) the “Yes” button activates the “Data Entry
Screen” (see 7.3.3 to enter your password). Enter password, then press
“Enter”. “Password Setting Screen” will pop-up. Enter a new password, and
enter the new password again to confirm, then press “Save”.

7.3.2.2 DISPLAY AVERAGING

Lightly pressing (or tapping) the “Display Averaging” box activates the
“Data Entry Screen” (see 7.3.3). Enter from 0 to 60 seconds. Display
averaging affects the analog output. Increase the display averaging time to
smooth out the pressure readings.

7.3.3 DATA ENTRY SCREEN

Enter numbers by pressing each key in sequence until the desired
character is displayed in the data entry box above the keypad. (Note: The
cursor will blink for one to two seconds then stop and display the
character.) Erase any mistakes by using the “Back Space” key. When
finished entering data, press the “Enter” key to return to SETUP UNIT
screen.

Example:
Enter number 3, press (or tap) 3/DEF key once.
Enter the letter T, press (or tap) the 8/STU key three times in succession.

7.2 MAIN MENU SCREEN

7.3 SETUP UNIT SCREEN

Monitoring Screen

Note: Use the eraser end of a pencil or back-end of a pen to press (or
tap) box on screen to increase accuracy of inputs.

7.4 SETUP ROOM SCREEN

7.4.1 SETUP ROOM OPERATION

Setup alarm limits for “protective” positive room static pressure, “isolating”
negative room static pressure or neutral (where the limits can be - to +).

7.4.2 ENTERING DATA

Press lightly or tap in the lower limit data entry box. Enter the lower limit
pressure. Enter the Upper Limit pressure. The Room type box will change
depending on the lower and upper limits. If both entries are positive, the
room will be a Positive Room. If both are negative, the room will be a
Negative Room and if the lower limit is negative and the Upper Limit is
positive the room will be a Neutral Room.

Lightly pressing (or tapping) the “Yes” button activates Operator password
protection. With Operator password protection enabled, room Occupied/No
Isolation status can not be changed without entering a valid Operator
password. Pressing “No” disables password protection. Pressing “Change”
will open “Password Setting Screen”. To change the password, enter the
present password, followed by the new password in the “New Password”
and “Confirm New Password” entry boxes, then press save.

7.4.3 ROOM MODE SCREEN

OCCUPIED/NO ISOLATION

Use these buttons to quickly change the room to standby or no isolation
status. If No Isolation is used there will be no alarms generated if the room
is outside pressure limits.

Press Save and Exit.

OPERATOR PASSWORD

The operator can only change the room from occupied to No Isolating and
vice versa.

7.5 ALARM SETUP SCREEN

7.5.1 ALARM SETUP OPERATION

Lightly press (or tap) button to select “Yes” or “No” for Latch Alarm, Audible
Alarm, or Door Alarm Inputs. Selected box background will change from
clear to black when selected.

7.5.2 MUTE TIME OUT/ALARM DELAY

Pressing (or tapping) the “Mute Time Out” or “Alarm Delay” box activates
the Data Entry screen to set the time.

7.6 SELF TEST SCREEN

7.6.1 Self Test Operation

This screen identifies the Product Model Part Number and Software
Version. User can also perform a Self Test of the unit to verify that the data
in protected area of the EEPROM memory hasn’t been corrupted and also
test the alarm to verify the sound level and alarm setup.

Press “Self Test” button to initiate EEPROM memory checksum test
sequence.

From this screen the user can access the following:

a. Latched Alarm requires the pressure to return to normal and the alarm
to be acknowledged before the alarm can be silenced and reset.

b. Enable the audible alarm by selecting “Yes” or use visual only alarm by
selecting “No”.

c. Provide a door “open” pre-alarm visual indication. When activated, the
door status “open” condition is indicated by the touch screen display
turning from green to yellow, and door open indicated on the monitoring
screen.

d. Set the time (in seconds) that the alarm can be silenced in the latched
alarm mode before the alarm resumes. This assumes that the room static
pressure is still outside the normal or set operating limits. The Mute Time
Out can be set from 0 to 60 seconds.

e. Set the Alarm Delay (in seconds) from the time that the room pressure
goes out of the preset limits until the alarm activates. The alarm delay may
be set from 0 to 60 seconds.

f. Set the alarm volume or sound level. Using the Up and Down keys, the
volume can be set at level 1-4. Level 4 alarm volume is the loudest and
corresponds to a sound level of 85 dB at a distance of 4 inches.

Press “Alarm Test” to test buzzer, visual Red LED Alarm, and relay output.
This can be used to verify the system in alarm mode.

Press “Cancel Test” to stop the alarm test.

Press “Exit” to return to Main Menu.

7.7 CALIBRATION SCREEN

7.7.1 CALIBRATION

To re-zero the device, disconnect the “room pressure” tube and lightly
press (or tap) the “Zero” button. Then apply a steady full-scale pressure
signal to the “+” or “room pressure” tube or fitting and press (or tap) the
“Span” button. Reconnect the room pressure tube and calibration is
complete. Calibration must be within ±5% of original calibration. The
original factory pressure calibration can be restored, if desired, by pushing
the “Restore Factory Setting” button.

BACnet Setup Screen

9.0 REMOTE ANNUNCIATOR (A-285)

The Remote Annunciator provides remote indication of room status.

To set up BACnet communications the MAC address enable switch (S1) on
the dip switch must be enabled by pushing it to the right.

Set MAC address, input the address of the device.

Select Device Instance by inputting the device instance into the data entry
box.

Select baud rate by press on the correct baud button, 9600 to 76800.

Save and Exit to save settings or cancel to cancel setting changes. Once
complete disable the BACnet setup by moving the dip switch position 1 to
off (left) position.

If the unit will be at the end of the line the pull up resistor can be enabled
by pushing position 3 to on.

The termination resistor can be inserted by pushing position 4 switch on.
The pull down resistor can be enabled by turning position 5 to on.

Save and Exit. After the unit returns to the main menu screen disconnect
the power to the unit and re-connect in order to boot up with the proper
MAC address and Device Instance.

Position Function

1

MAC address enable

2

N/C Not Connected

3

Pull Up Resistor

4

Termination Resistor

5

Pull Down Resistor

8.0 PRESSURE MONITORING SCREENS

The actual room static pressure is shown as a number on the LCD as well
as a “Moving Bar” indicator operating between the preset pressure limits.
Normal room pressure conditions within the preset pressure limits are
verified by a green colored screen. When the door is opened under
conditions within the preset pressure limits, the screen turns to yellow.
Room static pressure outside of the preset limits is indicated by a Red
screen after the alarm’s time delay expires.

Audible

Alarm

(A-285)

Green LED
Red LED

Audible Alarm

Acknowledge Switch

9.1 OPERATION

Under normal conditions, the green LED remains on. When an alarmed
condition occurs (i.e., room pressure falls outside preset range), a signal is
triggered by the RSM, the green LED shuts off, the red LED flashes, and
the audible alarm sounds. The acknowledge button can be pressed to
momentarily turn-off the audible alarm and the red LED will continue to
flash until the alarmed condition is corrected. When the alarmed condition
is corrected the annunciator will reset itself. The green LED will turn on,
and the red LED and audible alarm will shut-off.

10.0 CLEANING
Important

Do not blow into the pressure tubing or fittings with mouth, compressed air,
or canned air. Such actions may permanently damage the pressure sensor.

CLEANING YOUR RSM

Do not clean or wash-down the RSM with industrial cleaners or solvents.
The housing may be wiped down with soap and water or isopropyl alcohol.
The LCD may only be cleaned with isopropyl alcohol. Do not immerse unit.

Visual indication of normal room condition.
Visual indication of a breach in room pressure
protection.
Buzzer sounds to indicate breach in room
pressure protection.
Press to silence buzzer.

Green LED

Red LED

Acknowledge
Switch

CAUTION

(For 120/240 VAC Version Only): Do not open or remove RSM cover

(flathead screwdriver required) with input power applied unless performed
by a licensed electrician. “Hazardous Live” voltage is present at connector
J3 when power is applied. Please observe the warning symbol ( ) near
the J3 power connector.

11.0 AGENCY ELECTRICAL STANDARDS

This device falls into CSA “Pollution Degree 2” for PCB insulation and CSA
˝Installation Category 2˝.

The RSM meets the following requirements:

CSA Standard C22.2 No 0-M 91: General Requirements - Canadian
electrical code, Part 1

CAN/CSA C22.2 No. 0.4-04: Bonding of Electrical Equipment

CAN/CSA-C22.2 No. 61010-1-04: Safety requirements for electrical

equipment for measurement, control and laboratory Use Part-1: General
Requirements

ANSI/UL61010-1 (Second Edition): Safety requirements for electrical
equipment for measurement, control and laboratory use Part 1: General
Requirements.

12.0 MAINTENANCE

The RSM is designed to operate in an indoor environment, monitoring
clean, dry air. Upon final installation of the RSM Room Status Monitor, no
routine maintenance is required. A periodic check of system calibration is
recommended. The RSM is not field serviceable and should be returned if
repair is needed (field repair should not be attempted and may void
warranty). Be sure to include a brief description of the problem plus any
relevant application notes. Contact customer service to receive a return
goods authorization number before shipping.

13.0 LOCATION OF COMPONENTS AND ACCESSORIES

14.0 MENU TREE

MENU SETUP UNIT

SETUP ROOM

SETUP ALARM

BACK

YES

/

CHANGE

SAVE & EXIT

SELF TEST

CALIBRATION

©Copyright 2011 Dwyer Instruments, Inc. Printed in U.S.A. 2/11 FR# R1-443663-10

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]