General Operation; Er1200 Versions; Introduction; Internal Feedback Mode - Tescom ER1200 Series Operation & Service Manual

GENERAL OPERATION

ER1200 VERSIONS

This manual is a comprehensive documentation of specifications and operations of all versions of
the ER1200 Series regulator. The following table summarizes the differences in features for
different ER1200 versions. Use this table to check the version number of your ER1200. The
versions without an internal sensor do not have an "internal feedback" mode option.
PART NUMBER
ER1200-1
ER1200-2
ER1200-1-1
ER1200-2-1

INTRODUCTION

The ER1200 is a closed loop pressure control system capable of operating in two different modes.
In the "Internal Feedback" mode, the control is based on the internal pressure sensor, which has a
range of 0 - 100 PSIG. In "External Feedback" mode, the PID algorithm is based on an external,
customer provided transducer. The ER1200 requires both a setpoint, which is the desired output
pressure, and a feedback, the actual output pressure.

INTERNAL FEEDBACK MODE

In internal mode, the ER1200 compares the
feedback signal from the internal pressure
sensor to the setpoint input. Inside the unit,
there are two solenoid valves that control the
output pressure. If the feedback signal is
below setpoint, the ER1200 opens its inlet
valve and increases output pressure. If the
feedback is above setpoint, the ER1200
opens its exhaust valve to decrease the
output pressure. Every 25 milliseconds, the
feedback is compared to the setpoint and a
correction is made to make the output
pressure equal to the desired.
Inlet pressure:
Typical – 110 PSIG
Maximum – 120 PSIG
Minimum – 10 PSIG above required controlled
output pressure
Form # 1925 Rev. 4/06 TESCOM
INTERNAL SENSOR
(0-100 PSIG)
Yes
Yes
No
No
18" CABLE AND
STRAIN RELIEF
Yes
No
Yes
No
Figure 1
1
WATER TIGHT CONNECTOR
AND 2' MATING CABLE
No
Yes
No
Yes