Omega PHA-50 Owner Manual

 i MADE IN
WARRANTY
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PHA-50
Loop-Powered Isolators
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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.
GENERAL DESCRIPTION
The OMEGA? PHA-50 loop-powered isolator provides an isolated 4 to 20 mA out-
put equal to the 4 to 20 mA non-isolated output. This one-to-one current isolator
is used in a 4 to 20 mA two-wire loop to prevent ground loops. To eliminate
moisture and humidity problems, the electronics are encapsulated in epoxy and
the output is compensated for virtually zero temperature drift. À red LED lights to
indicate the isolator is operating (as loop current increases, LED becomes brighter).
The PHA-50 can be surface mounted in any position, and a trimpot control to ad-
just the output span is accessed by removing a protective cap.
UNPACKING
Remove the packing list and verify that all equipment has been received. If there
are any questions about the shipment, please call OMEGA Customer Service
Department at (203) 359-1660.
Upon receipt of the shipment, inspect the container and equipment for any signs
of damage. Take particular note of rough handling in transit. Immediately report
any damage to the shipping agent.
NOTE
The carrier will not honor any claims unless all shipping material is saved
for their examination. After examining and removing contents, save
packing material and carton in the event reshipment is necessary.
% X \
Ag
35.05
Y VA / |
MILLIMETERS 38 » \ 36.8
(INCHES) (15) (ET (1.45)
475
(1.87)
3.5 (.140) DIA.
2 HOLED THRU
Figure 1
Dimensions
ELECTRICAL HOOK-UP
The PHA-50 isolator is connected between the signal source and the load device
intended to be isolated (indicator, recorder, etc.). To determine the maximum load
which can be isolated by the PHA-50, the signal source's maximum load rating
(or maximum voltage capability) and the resistance (or voltage drop) of any loads,
including a two-wire transmitter if used, in the non-isolated 4-20 mA loop must
be known.
Do not connect loads of less than 20 ohms or more than 500 ohms to the PHA-50.
EXAMPLE USING VOLTAGE SOURCE
Suppose the voltage source (Vs) is 24.0 volts and the voltage drop across the two-
wire transmitter (VTWT) at 20mA is 14.0 volts. A recorder which presents a load
of 100 ohmsis connected in the non-isolated loop. Use the following equation to
determine the isolated load’s maximum allowable resistance, which must be bet-
ween 20 and 500 ohms:
Vg — VTWT - 4.5 |
ISOLATED LOAD _ _ oPTIONAL NON-ISOLATED
MAX. (in ohms) _ .020 LOAD tin ohms)
724. - 14.0 - 4.5 ! [ro o |
- | 020 | - | 100 | = 275 - 10001 175 ohms
PHA-50
OUT IN
Г. +! + —
ISOLATED т — TWO-WIRE | _
LOAD TRANSMITTER VOLTAGE
SOURCE
i 7 OPTIONAL ”,
NON-ISOLATED —
| _ _LOADIS). _.
EXAMPLE USING 4-20 mA SOURCE
Suppose the 4 to 20 mA signal source has a maximum load rating (Rmax) of 625
ohms and a recorder which presents a load of 100 ohms is connected in the non-
isolated 4 to 20 mA loop. Use the following equation to determine the isolated
load's maximum allowable resistance, which must be between 20 and 500 ohms:
ISOLATED LOAD _ | ВмАх (020) — 4-5 orion NON-ISOLATED
MAX. (in ohms) _ .020 ” LOAD (in ohms)
— 625 (.020) - 4.5 | [00 | |
= / 020 _ - Baad = 400 — 100 or 300 ohms
PHA-50
OUT IN
mp fm
ISOLATED | : =
| LOAD 4-20 mA
_ SOURCE
i 7” OPTIONAL”
NON-ISOLATED ——— |
1... _LOAD(S) _ _
Connect 4 to 20 mA or voltage source to ‘‘4 to 20 mA IN’ terminals, matching
polarity as indicated. Connect load device to be isolated to ‘4 to 20 mA OUT” ter-
minals, matching polarity as indicated.
OUTPUT SPAN ADJUSTMENT
The isolator's output span may be adjusted with or without a milliammeter. Us-
ing a milllammeter provides best accuracy, but the adjustment procedure without
it may be used if approximate accuracy is acceptable, or a milliammeter is not
available.
Adjustment without Milliammeter
1. Adjust source display to indicate full scale.
2. Remove protective cap to access OUTPUT SPAN trimpot control. Adjust OUT-
PUT SPAN trimpot until isolated load indicates full scale. This completes out-
put span adjustment.
Adjustment with Milliammeter
Two considerations must be kept in mind when adjusting output span with a
milliammeter. First, the milliammeter acts as an additional load. Combined total
impedances of milliammeter and isolated load must not exceed source's maximum
load rating after subtracting PHA-50 impedance of 225 ohms. Secondly, the
milliammeter’s impedance should be less than 3% of isolated load’s impedance
for best output span adjustment accuracy (the smaller the percentage, the
better).
1. Connect milliammeter in series with source output and PHA-50 input. Adjust
source output until milliammeter indicates exactly 18 mA.
2. Disconnect milliammeter and reconnect source output to PHA-50 input
terminal,
3. Connect milliammeter in series with PHA-50 output and isolated load. Remove
protective cap to access OUTPUT SPAN trimpot control. Adjust QUTPUT SPAN
trimpot until milliammeter indicates exactly 18 mA.
4. Disconnect milllammeter and reconnect isolated load to PHA-50 output ter-
minal. This completes output span adjustment.
SPECIFICATIONS
INPUT: 4 to 20 mA non-isolated
OUTPUT: 4 to 20mA isolated
INSERTION LOSS AT 20 mA: 4.5 Vdc (this represents a max. resistance of
225 ohms into the 4 to 20 mA loop)
ALLOWABLE ISOLATED LOAD: 20 to 500 ohms
ISOLATION: 1000 Vac or dc, transformer isolated
SENSITIVITY: 0.01 mA
STABILITY: 0.01 mA
NON-LINEARITY: +0.03% of span
ACCURACY: +0.01% of span
TEMPERATURE RANGE: —20 to 50°C
DIMENSIONS: 2%” x 1%” x 1”
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. OMEGA's 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 vibra-
tion; 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 instaliation 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.
5 T4 о RETURN REQUESTS/INQUIRIES 4
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
following information available BEFORE OMEGA for current repair charges. Have the
contacting OMEGA: following information available BEFORE
1. Purchase Order number under which contacting OMEGA.
the product was PURCHASED, 1. Purchase Order number to cover the
2. Model and serial number of the product COST of the repair,
under warranty, and 2. Model and serial number of the
3. Repair instructions and/or specific product, and
problems relative to the product. 3. Repair instructions and/or specific problems
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 2003 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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