Omega Products PHA-52 User Manual
Specifications
Input: 4 to 20 mA non isolated
Output: 4 to 20 mA 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: ±0.1%
Temperature Range: -20 to 50°C
Dimensions: 62.2mm H x 53.3mm W x
48mm D (2.45'' x 2.10'' x 1.89'')
Models
PHA-51 and PHA-52
Dual Alarm Modules
Adds Alarm Relay
Capability to Common
Analog Outputs
Ideal for Use with Two
Wire Transmitters
Independent Setpoint
and Dead Band Controls
for Each Relay
Relays Energize on
Increasing or Decreasing
Input Value-Switch
Selectable
NEMA 4X Gasketed
Enclosure Provides
Watertight Protection
The Model PHA-51 and PHA-52
dual alarm modules provide an ideal
way to add alarm capability to a
control system loop. The module’s
two relays each have setpoint and
deadband controls and an LED to
indicate on/off relay status. Relay
phasing switches individually select
each relay to operate in response to
increasing or decreasing input
signal value. For compatibility with
many systems, input levels are user
selectable. The PHA-51 accepts 0
to 20 mA, 4 to 20 mA, or 0 to 5Vdc
inputs and the PHA-52 takes 0 to 50
mV, 0 to 100 mV, 0 to 5 Vdc.
Specifications
Inputs: PHA-51: 0 to 20 mA, 4 to 20
mA, 0 to 5 Vdc; PHA-52: 0 to 50 mV,
0 to 100 mV, 0 to 5 Vdc
Outputs: 0 to 5 Vdc, 100 K ohms min.
load; 0 to 1 mA, 100 ohms max.
Power: 100 - 130 Vac
Relays: Setpoints: 0 to 100% of Input
Signal Range; Deadbands: 0 to 50% of
Signal Input Range; Contact Rating:
SPDT, 3A max. resistive, 250 Vac max.
3A max. resistive, 30 Vdc max.
Dimensions: 120.6mm H x 120.6mm W
x 63.5mm D x (4.75" x 4.75" x 2.5")
Weight: 567g (1.25 lb)
Model PHA-51
$
215
Model PHA-50
$
175
Model PHA-50
Loop Powered Isolator
Prevents Ground Loops
Transformer Isolated
Loop Powered
Virtually Zero
Temperature Drift
The PHA-50 loop-powered isolator
provides an isolated 4 to 20 mA output
equal to the 4 to 20 mA non isolated
input. This one to one current isolator
is used in 4 to 20 mA two wire circuits
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. The
PHA-50 can be surface mounted in
any position, and a trimpot control to
adjust the output span is accessed by
removing a protective cap.
Model PHA-51
Model PHA-50
To Order (Specify Model No.)
Model No. Price Description
PHA-50 $175 Loop power isolator
PHA-51 215 Dual alarm module (4-20 mA, 0-5 Vdc)
PHA-52 255 Dual alarm module (millivolt, 0 to 5 Vdc)
Alarm Module and Isolator
USA
MADE IN
N-45
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