!
FIGURE 1. OMNI-AMP IV Block Diagram
Features
n
100% Encapsulated
n
2 µV/°C Zero Stability
n
0.025°F/°F Reference Junction Stability
n
Up or Down Scale TC Burn-out
n
115 VAC or 230 VAC Power
n
Easy Mounting
n
±10 VDC Output
n
Input Protection to 115 VAC or DC
n
Scale Factor of 10 mV/°F
n
Over 120 dB CMRR at 60 Hz
Description
The OMNI-AMP IV is a high performance rugged epoxy
encapsulated thermocouple amplifier with built-in power
supply. It can be used with Type E, J, T, or K thermocouples
by changing only the span adjustment. Types R, S, and B can
be accommodated by ordering the 1 mV/°F scale factor
option. Only the highest quality industrial components are
used for reliable and long operation. Connections are made
with an ordinary screwdriver to rugged terminal strips. The
amplifier can be mounted using the set of bolts supplied with
the unit.
A reference junction temperature output is also supplied.
Figure 1 shows a block diagram of the amplifier.
Amplifier
The amplifier is a multiple IC instrumentation amplifier with
excellent zero and gain stability. Gain can be adjusted from 40
to 1500 so the amplifier can be used with a variety of
thermocouple signals. An internal path is provided for amplifier
input bias current. The amplifier has excellent common mode
rejection allowing the thermocouple input leads to be several
hundred feet long without degraded performance due to 60
Hz common mode pick-up. The amplifier is also protected
against an accidental over-voltage applied to the input. Please
note that the amplifier has cold junction compensation but not
linearization. The maximum output is ±10 Volts, providing up
to 1000°F output at 10 mV/°F or 10,000°F at 1 mV/°F.
OMNI-AMP IV
