Bulletin B-31 Series DHII Digihelic® II Differential Pressure

Bulletin B-31
Series DHII Digihelic® II Differential Pressure Controller
Specifications - Installation and Operating Instructions
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A.
Fax: 219/872-9057
e-mail: info@dwyer-inst.com
DIMENSIONS
4-23/32
[120]
1-31/64
[37.62]
1-1/2
[38.35]
3-7/16
[87.12]
!
4-23/32
[120]
1-45/64
[43.18]
2-23/64
[59.94]
1-17/32
[38.61]
1-5/16
[33]
1-45/64
[43.18]
45/64
[17.78]
1-1/16
[26.97]
MOUNTING HOLE
PATTERN
4X Ø3/16 [4.76]
CLEARANCE HOLES FOR
MOUNTING
3-17/64
[83]
1-7/8
[47.5]
4-1/8
[105]
OPTIONAL A-438 BRACKET
MOUNTING DIAGRAM
4-9/64
[105.17]
WIRING TERMINAL ACCESS
8-36 FLAT HEAD SCREWS
!
5-7/32
[132.56]
#8 LOCK WASHER
DO NOT REMOVE
THESE SCREWS
TO GAIN ACCESS TO WIRING TERMINALS,
REMOVE THESE TWO SCREWS AND “FLIP” DISPLAY
90° DO NOT REMOVE THE SCREWS WITH]
POWER APPLIED TO INSTRUMENT
WIRING
TERMINALS
HINGED
STANDOFF
1
SPECIFICATIONS
Service: Air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Housing Material: Aluminum, glass.
Accuracy: ±0.5% at 77°F (25°C) including hysteresis and repeatability (after 1 hour
warm-up).
Stability: < ±1% per year.
Pressure Limits: Ranges ≤ 2.5 in. w.c. = 2 psi
5˝: 5 psi; 10˝: 5 psi; 25˝: 5 psi; 50˝: 5 psi; 100˝: 9 psi.
Temperature Limits: 32 to 140°F (0 to 60°C).
Compensated Temperature Limits: 32 to 140°F (0 to 60°C).
Thermal Effects: 0.020%/°F (0.036/°C) from 77°F (25°C).
Power Requirements:
High Voltage Power = 100 to 240 VAC, 50 to 400 Hz or 132 to 240 VDC.
Low Voltage Power = 24 VDC ±20%.
Power Consumption:
Low Voltage Power = 24 VDC - 130 mA max.
High Voltage Power = 100 to 240 VAC, 132 to 240 VDC - 7VA max.
Output Signal: 4-20 mA DC into 900 ohms max.
Zero & Span Adjustments: Accessible via menus.
Response Time: 250 ms (dampening set to 1).
Display: 4 digit backlit LCD 0.6˝ height. LED indicators for set point and alarm status.
Electrical Connections: Euro type removeable terminal blocks with watertight
conduit fittings for 1/2˝ watertight conduit.
Process Connections: 1/8 female NPT.
Enclosure Rating: Designed to meet NEMA 4 (IP66).
Mounting Orientation: Mount unit in horizontal plane.
Size: 4.73˝ x 4.73˝ x 3.43˝ (120 mm x 120 mm x 87.1 mm).
Weight: 2 lb 10 oz (1.19 kg).
Serial Communications: Modbus® RTU, RS485, 9600 Baud.
Agency Approvals: UL & CE.
SWITCH SPECIFICATIONS
Switch Type: 2 SPDT relays.
Electrical Rating: 8 Amps at 240 VAC resistive.
Set Point Adjustment: Adjustable via keypad on face.
Modbus® is a registered trademark of Schnieder Automation.
2
WIRING
CONNECTOR ON
LOWER BOARD
1
2
3
6
7
C
3/8 A 250vac
MEDIUM LAG
100-240 VAC or
132-240 VDC POWER
NOTE 1
5
4
N/O
CONNECTOR ON
UPPER BOARD
8
1 2 3 4 5 6 7 8
A- RS485 SERIAL
B+ COMMUNICATION
C
N/C
SP1
RELAY
N/O
+ 24 VDC POWER
- NOTE 1
N/C
REMOTE
SWITCH
SP2 OR
ALARM
RELAY
+
4-20mA
TRANSMITTER
OUTPUT

-
RESET
Device receiving 4-20mA
signal. Check specifications
of this device for input load
resistance. Typical 250 to
600 OHMS, 900 OHMS
maximum.
WARNING
If Digihelic® II Controller is powered by 24 VDC, the device receiving the 4-20 mA
transmitter output MUST NOT share a common ground with the 24 VDC supply or
damage to the Digihelic® II Controller will result.
NOTES:
1. The instrument may be powered from the AC line or 24 VDC. Do not wire AC
line terminals 1-2 on the lower board and 24 VDC terminals 4-5 on the upper
board at the same time or damage to the unit will result.
2. For supply connections, wire in accordance with an equivalent national standard
or code. Use copper conductors only rated for at least 75°C.
3. Terminals on upper board are rated CLASS 2.
4. ISOLATION:
Relays - 1500 VAC to all other inputs and outputs.
AC Line Power (terminals 4-5) - 1500 VAC to all other inputs and outputs.
RS485 output - 500 VAC to all other CLASS 2 wiring.
The 24 VDC Power, 4-20 mA transmitter, and Remote Reset Switch share
a common ground.
5. The Remote Reset Switch must be a dry contact switch.
6. Shielded cable is required for RS485 wiring.
3
꟣
When wiring the instrument, you must follow industry standard practice for control and protection against Electro-Static Discharge (ESD).
Failure to exercise good ESD practices may cause damage to the
control.
WIRING
1. Remove cover.
2. To gain access to the wiring terminal blocks, remove the upper and lower screws
toward the center of the display board, and then flip the display board up at a
90° angle.
3. Wire to the two terminals blocks as shown in the wiring diagram.
NOTE: Depending on the application, it may be only necessary to wire to the smaller terminal block on the upper board. In that case one of the liquid tight fittings may
be removed and replaced with the provided rubber plug.
4. For liquid tight applications, use only 1/2˝ liquid tight conduit.
5. When wiring is complete, reverse steps 2 and 1. Make sure the cover is
properly tightened to the housing.
DIGIHELIC® II CONTROLLER RS485 WIRING
DIGIHELIC - RS485 WIRING TO DAISY CHAIN INSTRUMENTS
UP TO 128 UNITS MAY BE DAISY CHAINED
ON THE RS485 BUSS
LAST UNIT ON RS485 BUSS
CONNECTOR ON
LOWER BOARD
1
2
3
4
5
6
CONNECTOR ON
LOWER BOARD
CONNECTOR ON
UPPER BOARD
7
8
1
1 2 3 4 5 6 7 8
2
3
4
5
6
CONNECTOR ON
LOWER BOARD
CONNECTOR ON
UPPER BOARD
7
8
1 2 3 4 5 6 7 8
SHIELD
SHIELD
WIRE NUT
1
2
3
4
5
6
CONNECTOR ON
UPPER BOARD
7
8
1 2 3 4 5 6 7 8
120 OHM
RESISTOR
TIE SHIELD TO EARTH GROUND
TO RS232 TO
RS485 CONVERTER
THE 120 OHM RESISTOR
IS USUALLY ONLY
NECESSARY
FOR LONG
WIRE RUNS.
INSTALLATION
Mount the instrument in a location that will not be subject to excessive temperature, shock or vibration.
Pressure Connections
Use 1/8 male NPT fittings. When tightening fittings, grasp the brass fitting on the
Digihelic® II Controller with a 1/2˝ wrench to prevent the fitting on the Digihelic® II
Controller from turning.
4
MULTIPLIER DESCRIPTOR
VISIBLE WITH SOME VELOCITY
AND FLOW RANGES
FRONT PANEL
X1K
UNITS
99.99
SP1
DESCRIPTOR
SP2
DESCRIPTOR
SCFM
SP1
SP2
ALLO
ALHI
SP/AL
MENU
E
RST
PROCESS
VALUE
HIGH ALARM
DESCRIPTOR
LOW ALARM
DESCRIPTOR
KEY FUNCTIONS
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
MENU
MENU
MENU
MENU
MENU
MENU
HOME POSITION FUNCTION MAIN MENU FUNCTION
SUB MENU FUNCTION
Sequences the display
through SET POINT and
ALARM settings
Return to home
position
Return to home position
Allows access to the
menus
Return to home
position
Return to previous menu
Sequences through
menus
Increments a value
Sequences through
menus
Decrements a value
Enter into SUB MENU
Changes a value or
setting. Press ENTER
and display will blink.
Adjust with UP or DOWN
arrows. Press ENTER to
store. Display will stop
blinking.
MENU
UP
ARROW
E
E
E
E
E
ENTER
DOWN
ARROW
Displays full scale
range of unit
RST
RST
RST
RST
RST
RST
RESET
Clears or resets an Alarm
(alarm set for manual
reset)
Peak/Valley SUB
MENU resets display to
present value.
5
SETTING SET POINTS AND ALARMS
The SP/AL hot key provides direct access to the Set Point and Alarm MENU. The
Set Point and Alarm MENUS that are displayed are based upon the Control (CtrL)
SUB MENU.
CONTROL MODE
CONTROL MODE
CONTROL MODE
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
SP/AL
Visible when
mode =
Visible when
mode =
Visible when
mode =
SET POINT ADJUSTMENT
Adjusting the Digihelic® II Controller Set Points is quick and simple. Instead of setting a set point and deadband, simply adjust SP1H or SP2H for the desired relay
turn on point, and then adjust
SP1L or SP2L for the desired relay turn off point.
1.0
0.8
0.6
PRESSURE
(in. w.c.)
0.4
0.2
0
0
TIME
In the above graph, an instrument with a 1.0˝ range would have the SP1 relay turn
on at 0.8˝ and off at 0.4˝. SP1H sets the relay turn on point, and SP1L sets the relay
turn off point. The relays outputs normally function in the direct acting mode, which
means the relays turn on with an increase in pressure. SP1 may be configured to act
as a reverse acting relay (refer to the 1SP SUB MENU setting, page 15). When set
for reverse acting, SP1H sets the relay turn OFF point, and SP1Lsets the relay turn
ON point. SP2 is always direct acting.
6
MENU MAP
MAIN MENUS
SUB MENUS
SETTINGS
SP/AL
SP/AL
MENU
MENU
E
E
MENUS
UNAVAILABLE
FOR
BI-DIRECTIONAL
RANGES AND
RANGES ABOVE
25 IN. W.C.
RST
RST
SP/AL
MENU
SP/AL
CONTINUED
E
MENU
7
MAIN MENUS
SETTINGS
SUB MENUS
SP/AL
SP/AL
MENU
MENU
E
E
SP/AL
RST
RST
MENU
CONTINUEDSP/AL
E
MENU
8
SP/AL
MAIN MENUS
SETTINGS
SUB MENUS
SP/AL
Menus present only
in pressure operation
MENU
MENU
E
E
SP/AL
RST
MENU
RST
SP/AL
E
MENU
RST
E
9
Main Menu Selections (Upper Right Display Reads MENU )
SECr Security - Lock out access to Set Point and Alarm settings, or lock out
access to all settings.
OPEr Operation - Selection of Pressure, Velocity or Flow and corresponding
engineering units.
OUt
Output - Select a Single Set Point, 2 Set Points, or a Set Point and an
Alarm mode of operation.
d.S
Display - Monitor and adjust display related settings: Peak, Valley, display
resolution, % output and dampening.
AdU
Advanced functions - Modify advanced function parameters, transmitter
output scaling, Modbus® communication settings, Maintenance Set Point
settings and calibration.
10
MAIN MENUS and SUB MENUS
SECr (Security) MAIN MENU
SECr is the only SUB MENU in the security MENU. When the security
SUB MENU is selected, the present security level is displayed in the
upper right hand display. To change the security level, adjust the
number displayed to the number shown in the following table for the
desired security level.
Security Level
Displayed
Access
Password
Value to Enter
1
All menus access
10
2
Menu Access
SP/AL Locked
70
3
SP/AL Access
Menus Locked
90
4
All settings locked
111
The password values shown in the table cannot be altered, so retain a copy
of these pages for future reference.
OPEr (Operation) MAIN MENU
The OPEr MENU selects the measurement type of the instrument.
The SUB MENUS are:
PrES - Pressure
KFAC - K Factor
XDIM - X Dimension
UEL - Velocity
ArEA - Area
YDIM - Y Dimension
FLO - Flow
DIA - Diameter
OPEr MENU will have an additional KFAC
SUB MENU. If the instrument is set for Flow, the OPEr MENU will have additional
KFAC and ArEA SUB MENUS. These will be discussed under Velocity and Flow.
When scrolling through the OPEr SUB MENUS, the measurement type the unit is
If the instrument is set for Velocity, the
currently set for will show the units in the upper right display. The other measurement types will have a blank upper right display.
Units visible, so unit
is presently set to
measure pressure
Units not visible
11
Units not visible
PrES (Pressure) SUB MENU
For pressure measurement, the following units are available:
INWC - Inches of water column
FTWC - Feet of water column
MMWC - Millimeters of water column
CMWC - Centimeters of water column
PSI - Pounds per square inch
INHG - Inches of mercury
MMHG - Millimeters of mercury
MBAR - Millibar
PA - Pascal
KPA - Kilopascals
HPA - Hectopascals
OZIN - Ounce inches
Table 1 Pressure Range vs. Available Units
INWC FTWC MMWC CMWC
.1000
.2500
.5000
1.000
2.500
5.000
10.00
25.00
50.00
100.0
.2083
.4167
.8333
2.083
4.167
8.333
2.540
6.350
12.70
25.40
63.50
127.0
254.0
635.0
1270
2540
.2540
.6350
1.270
2.540
6.350
12.70
25.40
63.50
127.0
254.0
PSI
INHG MMHG MBAR
.1806
.3613
.9032
1.806
3.613
.1868
.4671
.9342
1.868
4.671
9.342
18.68
46.71
93.42
186.8
.1839
.3678
.7356
1.839
3.678
7.356
.2491
.6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
PA
24.91
62.27
124.5
249.1
622.7
1245
2491
6227
KPA
HPA OZIN
.1245
.2491
.6227
1.245
2.491
6.227
12.45
24.91
.2491
.6227
1.245
2.491
6.227
12.45
24.91
62.27
124.5
249.1
.1445
.2890
.5780
1.445
2.890
5.780
14.45
28.90
57.80
NOTE: OVFL(over flow) or UnFL(under flow) will appear when the ranges have been
exceeded above or below full scale by 2%.
UEL (Velocity) SUB MENU
For velocity measurement, the following units are available:
SFPM - Standard feet per minute
M/S - Meters per second
Table 2 Available Velocity Ranges
INPUT RANGE INWC SFPM RANGE
0 - 0.1
0 - 0.25
0 - 0.5
0-1
0 - 2.5
0-5
0 - 10
0 - 25
0 - 1266
0 - 2002
0 - 2832
0 - 4004
0 - 6332
0 - 8954
0 - 12.66 x IK
0 - 20.02 x IK
M/S RANGE
0 - 6.431
0 - 10.17
0 - 14.39
0 - 20.35
0 - 32.17
0 - 45.48
0 - 64.33
0 - 101.7
NOTE: Air velocity and flow readings are based upon standard dry air conditions with an
ambient temperature of 70°F and a barometric pressure of 29.92 INHG.
12
FLO (Flow) SUB MENU
For flow measurements the following units are available:
SCFM - Standard cubic feet per minute
M^3H - Cubic meters per hour
FLO r (Flow Range) SUB MENU
LO - 99.99 x 1K flow range
HI - 999.9 x 1K flow range
Tables 3 -6 show the flow ranges available, and the maximum duct size that can
be set for each input range.
Table 3
Table 4
FLOr = LO Maximum Duct Size (English)
FLOr = HI Maximum Duct Size (English)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
SCFM
RANGE
99.99
99.99
99.99
99.99
99.99
99.99
99.99
99.99
x
x
x
x
x
x
x
x
1K
1K
1K
1K
1K
1K
1K
1K
MAX. DUCT
SIZE, SQ. FT.
RANGE
IN WC
78.9
49.9
35.3
24.9
15.7
11.1
7.8
4.9
0.1
0.25
0.5
1
2.5
5
10
25
SCFM
RANGE
999.9
999.9
999.9
999.9
999.9
999.9
999.9
999.9
x
x
x
x
x
x
x
x
1K
1K
1K
1K
1K
1K
1K
1K
MAX. DUCT
SIZE, SQ. FT.
789.8
499.5
353.1
249.7
157.9
111.7
78.9
49.9
Table 5
Table 6
FLOr = LO Maximum Duct Size (Metric)
FLOr = HI Maximum Duct Size (Metric)
RANGE
IN WC
0.1
0.25
0.5
1
2.5
5
10
25
Mˆ3/Hr
RANGE
99.99
99.99
99.99
99.99
99.99
99.99
99.99
99.99
x
x
x
x
x
x
x
x
1K
1K
1K
1K
1K
1K
1K
1K
MAX. DUCT
SIZE Mˆ2
RANGE
IN WC
4.32
2.73
1.93
1.37
0.86
0.61
0.43
0.27
0.1
0.25
0.5
1
2.5
5
10
25
Mˆ3/Hr
Range
999.9
999.9
999.9
999.9
999.9
999.9
999.9
999.9
x
x
x
x
x
x
x
x
1K
1K
1K
1K
1K
1K
1K
1K
MAX. DUCT
SIZE, Mˆ2
43.19
27.31
19.3
13.64
8.63
6.10
4.31
2.73
KFAC SUB MENU
KFAC K Factor - becomes accessible if the instrument is set for Velocity or Flow.
When the Digihelic® II Controller is used with a pitot tube, the manufacturer
may specific a K Factor. The adjustment range is 0.01 to 2.00. The factory
setting is 1.
13
ArEA, DIA, XDIM and YDIM SUB MENUS
These SUB MENUS become accessible if the instrument is set for flow. When measuring flow, the area of the duct must be specified. Tables 3 and 4 show the input
range vs maximum flow and duct size. For a rectangular duct the maximum size is
specified in square feet or meters. For a circular duct the maximum size is specified
as the diameter. X, Y and circular dimensions are entered in feet with 0.01 foot resolution for FLOr = LO and 0.1 foot resolution for FLOr = HI, or entered in millimeters
with 1 millimeter resolution.
ArEA - Area, select CIR for a circular duct or RECT for a rectangular
duct. If a circular duct is selected, the DIA SUB MENU will be activated. If a
rectangular duct is selected, the XDIM and YDIM SUB MENUS will be activated.
DIA - Diameter, enter the diameter of a duct
XDIM - Enter the “X” dimension of a duct
YDIM - Enter the “Y” dimension of a duct
Y
X
OUt (Output) MAIN MENU
The OUt MENU selects the output type of the instrument. The SUB
MENUS are:
CtrL- Control type
ISP - SP1 reverse or direct acting
AL - Alarm type
ALrE - Alarm reset, manual or auto
AL.H - Alarm inhibit
ALDL - Alarm delay
14
CtrL (Control) SUB MENU
1SP - Single set point
2SP - Two fully independent set points
SPAL - Single set point and alarm
1SP (SP1 Reverse or Direct Acting) SUB MENU
DIR - Direct. Relay turns on with increasing pressure
REV - Reverse. Relay turns on with decreasing pressure
Direct Acting
100
Process
SPH
SPL
0
Time
Relay Inactive
Relay Active
Reverse Acting
100
Process
SPH
SPL
0
Time
Relay Inactive
Relay Active
15
The following alarm function SUB MENUS are activated when CtrL is set to
SPAL:
AL (Alarm Type) SUB MENU
HI - High alarm
LO - Low alarm
HILO - For a high/low guardband type alarm
ALARM ADJUSTMENT
Alarm settings are dependent upon the selected alarm mode. The Digihelic® II
Controller alarm may be configured as a High Alarm, Low Alarm, or High/Low Alarm.
Alarm settings are all absolute and may be set to anywhere within the range of the
instrument. The dead bands of the alarms are fixed at 1% of full scale.
HIGH ALARM FUNCTION
ALHI
MIN. PRESSURE
MAX. PRESSURE
Relay OFF
ALLO
Relay ON
LOW ALARM FUNCTION
MIN. PRESSURE
MAX. PRESSURE
Relay ON
Relay OFF
ALHI
ALLO
HIGH/LOW ALARM
FUNCTION
MIN. PRESSURE
MAX. PRESSURE
Relay ON
Relay OFF
16
Relay ON
ALrE (Alarm Reset) SUB MENU
ONOF - Automatic reset
HOLD - Manual reset. An alarm is reset by the RESET key on the front
panel, or an external reset switch.
AL.H (Low Alarm Inhibit) SUB MENU
ON - Alarm inhibit is on
OFF - Alarm inhibit is off
If AL.H is selected ON, a low alarm condition is suspended upon power
up until the process value passes through the alarm set point once.
ALDL (Alarm Delay) SUB MENU
Sets the amount of time an alarm condition must be continuously met before
the alarm condition is recognized. The alarm delay is adjustable from 0-3600
seconds.
d.S (Display) MAIN MENU
PEAK - Peak value
VALy - Valley value
ZERO - Zero
rESO - Resolution
Pd.S - Process display
DAMP - Dampening level
PEAK (Peak) SUB MENU
The Peak feature stores the highest pressure reading the instrument has
measured since the last reset or power up. At power up PEAK is reset
to the present pressure reading. To manually reset the PEAK value,
press the RESET key while in the
PEAK SUB MENU.
VALy (Valley) SUB MENU
The valley feature stores the lowest pressure reading the instrument has
measured since the last reset or power up. At power up VALy is reset to
the present pressure reading. To manually reset the VALy value, press the
RESET key while in the
VALy SUB MENU.
17
rESO (Resolution) SUB MENU
The Digihelic® II Controller is capable of displaying four digits of resolution.
However, at very low pressures the instability of the pressure may cause
fluctuations in the least significant digit causing the least significant digit to be
of little value.
Three digit resolution (3DIG) can only be active when there is at least one digit
to the right of a decimal.
3DIG - Set display for 3 digit resolution
4DIG - Set display for 4 digit resolution
Pd.S (Process Display) SUB MENU
STD - Display reads pressure, velocity, or flow values
PCT - Display reads % of full scale value
When the display is reading percent, PCT is displayed in the upper right of
the display. The percent display is only available in pressure operation.
DAMP (Dampening) SUB MENU
Adjust from 1-16
Dampening stabilizes the display from instabilities due to things such as
vibration and excessive pressure fluctuations. The dampening setting adjusts
the amount of readings that are averaged for each display update. Adjust
the dampening value until the display reads a stable value for the application.
AdU (Advanced) MAIN MENU
POL - Process output low
POH - Process output high
MSP1 - Maintenance set point 1
MSP2 - Maintenance set point 2
ADDR - Modbus® address
WR - Modbus® write enable/disable
ZERO - Zero calibration
SPAN - Span calibration
POL and POH (Process Output Low and High) SUB MENUS
This feature is used in pressure operation only.
Process output low and high are used to scale the 4-20 mA output. Set
POL to the desired display reading for 4mA output, and set POH to the
desired display reading for 20 mA output. POH must be higher than POL.
POL may be adjusted 2% BELOW minimum scale up to POH. POH may
be adjusted from POL to 2% ABOVE maximum scale.
18
MSP1 and MSP2 (Maintenance Set Point 1 & 2) SUB MENUS
Adjust for the desired maintenance set points when the unit is placed in the
maintenance mode. The deadband is fixed at 2% of full scale. To enter or
leave the maintenance mode, press and hold the SP/AL for 8 seconds.
ADDR (Modbus® Address ) SUB MENU
Modbus® communication instrument address. Set from 1 to 247. This number must match the address number used by the MENU
host computer.
To obtain the Digihelic® II Controller Modbus® register list please visit
www.dwyer-inst.com
See page 4 for wiring diagram.
WR (Modbus® Write Protect) SUB MENU
d.S - Disables write commands from Modbus®. Modbus
E ® can only read
information from the instrument.
En - Enable write commands from Modbus®. Modbus® can read information
from and write information to the instrument.
ZERO and SPAN (Calibration of Zero and Span) SUB MENUS
RST
The lower display reads
CAL in this mode.
ZERO Calibration
NOTE: For accurate calibration, DO NOT apply any pressure when
performing this function.
With the display reading ZERO, press the ENTER key. The upper display will
blink. Press ENTER again to complete the zeroing of the instrument or press
the MENU key to cancel.
SPAN Calibration
With the display set to SPAN, apply full scale pressure to the unit. Press the
ENTER key. The upper display will blink. Press ENTER again to complete the
calibration or press the MENU key to cancel.
©Copyright 2007 Dwyer Instruments, Inc.
Printed in U.S.A. 11/07
FR# 19-443434-00 Rev. 2
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000
www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, IN 46361, U.S.A.
Fax: 219/872-9057
e-mail: info@dwyer-inst.com
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