Omega PX921 Series Owner Manual

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ISO 9001) 509002
CER CERTIFIED
CORPORATE QUALITY CORPORATE QUALITY
STAMFORD, CT MANCHESTER, UK
PX921
WIRELESS
PRESSURE TRANSMITTER
INSTALLATION INSTRUCTIONS
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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that
apply. OMEGA is constantly pursuing certification of its products to the European New Approach
Directives. OMEGA will add the CE mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts
no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, human applications.
SYSTEM DESCRIPTION
The PX921 wireless pressure transducer provides the means for remote pressure
measurement without the need to lay-down cables. Utilizing an advanced
microprocessor and UHF radio design, pressure measurements are digitally encoded
and transmitted in a secure data frame to the PX921-R receiver over a distance of up
to 500ft line-of-sight.
The PX921 uses a unique data transmission protocol, developed specifically for radio
telemetry systems. Each transmitted message includes the address of its source and.
its destination, and has a check-sum to allow the detection of any corruption of the
message.
The PX921-R receiver will decode the received message and verfty that the addresses
match and that the check-sum is valid. Once this is complete the receiver will convert
the pressure reading to a 4-20mA output signal.
PX921 INSTALLATION
POWER SUPPLY
Powering of the PX921 is achieved by a intemal 1/2AA 3.6V lithium battery, which is
able to power the unit for up to 1 year without replacement. Altematively an external
8-30Vdc supply can be used. This makes the internal battery act as a backup supply,
which will take over powering the unit if the external supply is removed or fails. When
supplied new the intemal battery circuit is disconnected.
MEASUREMENT AND TRANSMISSION CYCLE
The time interval between each measurement and transmission cycle can be selected
from one of four settings. In between each transmission, the PX921 switches to a very
low power sleep mode. The majority of the power consumption occurs during the
radio transmission cycle, therefore by selecting the longest time interval between each
transmission, the low average power consumption is achieved. This is important when
using only the intemal battery supply, as this will affects the service life of the battery.
Please selected the most suitable setting from table 1.
SWA2 TRANSMIT CYCLE TYPICAL BATTERY LIFE
1 2
0 0 1 in 200 mS 1000 hours
4 0 1in 3 seconds 5000 hours
0 1 1in 10 seconds - 8000 hours
1 1 1 in 45 seconds 9300 hours
O=switch off
1=switch on
Table 1. Measurement and transmission cycle.
ELECTRICAL CONNECTION AND CONFIGURATION
See installation drawing figure 2.
1.
2.
Remove the screw lid to reveal the front panel.
Select the 8 bit identification address for the PX921 using the 8 way DIP switch
array SWA1(the receiver will need to match this address).
256 address code combinations are available.
Select the required time intervals between each "Measurement and
Transmission cycle" using the 2 way DIP switch array SWA2.
When using an external supply, feed the power cable through the cable gland
provided and tighten sealing nut. Connect the supply leads to the specified
screw terminals.
When using the intemal battery supply as a backup or main supply, connect the
jumper plug to close Link1,
The unit will operate correctly as soon as the supply voltage is applied.
The transmission cycle will be indicated by the green LED, which will tum on
during transmission period and off during the delay period.
A local check of the PX921 calibration can be made. To do this first connect
the jumper plug to close Link2. This forces the electronics not to go into sleep
mode between transmissions. The calibration signal can then be measured
across the local output terminal relative to the negative supply connection.
This signal is factory set: 0.2 to 1.0Vdc for Zero and Fuil-scale respectively,
which will be reproduced as a 4-20mA output signal at the remote PX921-R
receiver.
As soon as this process is over, unplug the jumper across Link2.
Failure to do this will reduce the battery service life significantly.
Zero and Span adjustments can be made if necessary by tuming the trimming
screws on the front panel, identified on the installation drawing.
When the electrical installation and configuration is complete, replace the screw
lid and tighten down on to the seal.
PROCESS CONNECTION
‚ See installation drawing figure 1.
1. The PX921 has a 1/2NPT connection thread, which can be directly mounted
| as shown.
2. Tightening of the process connection should be performed with a 27mm A/F
spanner on the hexagon section as shown.
The threaded port and all wetted parts are stainless steel and provide high corrosion
resistance.
PX921-R INSTALLATION
WALL MOUNTING
The PX921-R receiver is intended for wall mount installation.
- To attach the unit to the intended surfaces first, unscrew the 4 retaining screws and
remove the plastic enclosure lid. Locate the 4 x 4mm diameter. fixing through holes
situated in each comer of the enclosure, with centres at 188 x 89mm. Attach the
enclosure to wall surface with 4 screws through the enclosure fixing holes. See
installation drawing figure 4.
The receiver should be mounted in a position to allow a line-of-sight path for the radio
transmission from the PRX921. Any obstacles or walls in the radio path will reduce the
operating range. Under good conditions, 500ft. range is achievable.
As with all radio receiver equipment the enclosure should NOT be mounted with the
antenna near to any large metal or electrically conductive surfaces. Positioning the
antenna close to conductive surfaces may de-tune the antenna and reduce the
operating range.
For mouriting directly onto a metal lath and plaster or a foil backed insulation wall, use
a block of wood or plastic to lift the enclosure away from the wall surface, as shown.
ELECTRICAL INSTALLATION
See installation drawing figure 5.
With the lid removed 3 x 4 way screw terminal plugs are visible with connections
numbered 1 to 12. All electrical connections are made to these terminals.
Power connections
Note: 16/0.2mm wire or larger should be used for power wiring. An external 0.25 amp
fast blow fuse should be fitted in the supply line.
The supply voltage can be selected to be one of the following.
95 to 132 Vac (110 V nominal) — 43to67 HZ.
190 to 264 Vac (240 V nominal) 43to 67 Hz.
Supply voltage Terminal Connection
110 Vac AC Live to terminal 1 and 3
AC Neutral to terminal 2 and 4
240Vac AC Live to terminal 1
AC Neutral to terminal 4
Link terminal 2 and 3.
External battery/DC supply
An external battery or DC voltage supply can be used instead of mains power.
A 0.5 amp fast blow fuse should be fitted in the EXT. battery line.
Supply voltage Terminal Connection
10.8 to 30 Vdc +Supply to termina! 5
- Supply to terminal 6.
Note that the Red LED is illuminated when the power supply is connected.
Address code
An 8 way DIP switch is used to select the required transmitter and receiver address
codes. The 8 Bit address code must be set the same for the PX921 and PX921-R
units. 256 address code combinations are available.
QUTPUTS
Current signal
The 4-20mA output signal is provided on terminals 11 (+lout) and 12 (lout). The
4-20mA output signal has a compliance voltage of 8.5Vde, and wilt drive a 400 ohm
load.
Communication failure alarm
The Green LED is switched on (illuminated) to indicate that a communication link is
present between the transmitter and receiver units, and will switch off if the
communication link is lost. This indication is also available as an open drain switch,
which is connected to terminal png(-Alarm) and can switch a load connected to pin7.
The drain connection is high impedance when the alarm is on and switched to OV when
the alarm is off.
Communications watchdog
The time period that the receiver unit waits to receive a valid data frame before
activating the communication failure alam is set to 128 seconds.
‘ PX921 WIRELESS PRESSURE TRANSMITTER
INPUT
Pressure ranges
Qver pressure
OUTPUT
Local test voltage
Data transmission
Sample rate
RADIO
Type:
Power level
Modulation
POWER SUPPLY
Battery:
Type:
Service Life:
External:
Voltage range
Current drain
ACCURACY
Resolution |
Linearity and hysteresis
ENVIRONMENTAL
Housing
Pressure port
IDENTIFICATION ADDRESS:
DIMENSIONS:
WEIGHT:
PROCESS CONNECTION
OPERATING TEMPERATURE
STORAGE TEMPERATURE:
Technical Specification
0-10psi to 0-10,000psig
1.5 x rated pressure
0.2 to 1.0Vde
Serial data packet @ 2400 baud.
Up to 1 sample per 200mS (see table 1).
UHF low power licence exempt.
250uW ERP.
FM.
3 6V/ 1AHr 1/2AA lithium thionly chioride
See table 1.
8 to 30Vde
10mA peak .
0.05%FS (12 bitAD.C.).
0.3% F.S.
All 316 stainless steel, rated IP65.
All wetted part stainless steel or Titanium.
8 Bit, 256 selectable combinations.
Height: 1368mm Diameter:60 mm (see figuré 3).
Approximately 2.8 lbs.
1/2NPT.
10 to +135degF.
_-20 degF to +150 degF.
PX921-R SINGLE CHANNEL RADIO RECEIVER
Technical Specification
RADIO TYPE: UHF/FM receiver.
SENSITIVITY: -110dBm (range of 500ft light-of-sight).
IDENTIFICATION ADDRESS: 8 Bit, 256 selectable combinations.
COMMUNICATION WATCHDOG: 128 seconds before alarm output is activated.
ALARM OUTPUT: Open drain switch, maximum current 250mA.
ANALOGUE OUTPUT: 4-20mA, 0.2 - 2.0\/Чс.
CURRENT QUTPUT COMPLIANCE: 8.5 Vdc.
RESOLUTION: Better than 0.05% (12 bit).
POWER REQUIREMENTS: 110/240V 50-60Hz or 10.5-30Vdc.
CURRENT REQUIREMENTS: 32mAdec.
HOUSING: High impact polycarbonate, rated to IPG5.
DIMENSIONS: 200 x 120 x 75 mm.
WEIGHT: Approximately 2 lbs.
OPERATING TEMPERATURE: 10 degF to +135 degf.
STORAGE TÉMPERATURE: -20 degF to +150 degF.
ANTENNA: 1/4 wave helical in plastic moulding.
RF CONNECTOR: External BNC.
CABLE ENTRY: [P85 Nylon cable gland, for cable diameter 4 to 8mm.
ELECTRICAL CONNECTIONS Screw terminal plug and socket wire size from 0.5 to 1.[5mm2.
PX921 INSTALLATION DRAWINGS
27 ASF—
HEX
a
of _ (LT ome
—’P
20
1/2 NPT
DIMENSIONS IN MM =
Figure 1. Process Connections
LOCAL CALIBRATION
QUTPUT
BATTERY ADJUSTMENT
SPAN
TX ON
INDICA
ZERO
ADDRESS
SWAT
SWITCHES
TX DELAY
SWA2
SWITCHES
8—-30Vdc
оу
Figure 2. Electrical Connections
PX921 TRANSMITTER
N 260
136
8 (T_T }---27 АЕ НЕХ.
20 TT
L—— 1/2 NPT
DIMENSIONS IN MM
rigure 3. Dimensional detail
DIMENSIONS
+00
200
E UU
58 > 120
DIMENSIONS IN M.M.
Figure 4A. PX921—R Dimensions
MOUNTING DETAIL
| би 60 A
MER | Вай -——РХ921-В
comm NINIMUM
Figure 4B. PX921—R Mounting Detail
1234 5678
810112
494 208680] 2080
OD (ao,
—lout
Va ele tr Hout
БОН: —Vout
+Veut
nme we AL AFTRA
—— +ALARM
ne. —BATIERY
— — — BATTERY
Figure 5, PX921—R
Flectrical Connections
WARRANTY/DISCLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a
period of 13 months from date of purchase. OMEGA's WARRANTY adds an additional one (1) month
grace period to the normal one (1) year product warranty to cover handling and shipping time. This
ensures that OMEGA’s customers receive maximum coverage on each product.
If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA's Customer Service
Department will issue an Authorized Return (AR) number immediately upon phone or written request.
Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no
charge. ОМЕСА $ WARRANTY does not apply to defects resulting from any action of the purchaser,
including but not limited to mishandling, improper interfacing, operation outside of design limits,
improper repair, or unauthorized modification. This WARRANTY is VOID if the unit shows evidence of
having been tampered with or shows evidence of having been damaged as a result of excessive corrosion;
or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating
conditions outside of OMEGA's control. Components which wear are not warranted, including but not
limited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. However,
OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any
damages that result from the use of its products in accordance with information provided by
OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by it will be
as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR
REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESS OR IMPLIED, EXCEPT THAT OF TITLE,
AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF
LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of
OMEGA with respect to this order, whether based on contract, warranty, negligence,
indemnification, strict liability or otherwise, shall not exceed the purchase price of the
component upon which liability is based. In no event shall OMEGA be liable for
consequential, incidental or special damages.
CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic
Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical
applications or used on humans. Should any Product(s) be used in or with any nuclear installation or
activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility
as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify
OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the
Product(s) in such a manner.
Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE
RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN
(AR) NUMBER FROM OMEGA'S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID
PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return
package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent
breakage in transit.
FOR WARRANTY RETURNS, please have the FOR NON-WARRANTY REPAIRS, consult OMEGA
following information available BEFORE for current repair charges. Have the following
contacting OMEGA: information available BEFORE contacting OMEGA:
1. Purchase Order number under which the product| 1. Purchase Order number to cover the COST
was PURCHASED, of the repair,
2. Model and serial number of the product under 2. Model and serial number of the product, and
warranty, and 3. Repair instructions and/or specific problems
3. Repair instructions and/or specific problems relative to the product.
relative to the product.
OMEGA's policy is to make running changes, not model changes, whenever an improvement is possible. This affords
our customers the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2004 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied,
reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the
prior written consent of OMEGA ENGINEERING, INC.
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