American Magnetics 188CPS User Manual

EXCELLENCE IN MAGNETICS AND CRYOGENICS

MODEL 188CPS

AMI

POINT-SENSING INSTRUMENT

INSTALLATION, OPERATION, AND

MAINTENANCE INSTRUCTIONS

American Magnetics, Inc.

PO Box 2509, 112 Flint Road, Oak Ridge, TN 37831-2509, Tel: 865 482-1056, Fax: 865 482-5472

Rev. 1, Feb 1998

Introduction

The American Magnetics, Inc. (AMI) Model 188CPS Point Sensing Instrument system is a microprocessor-based solution designed to provide sensing for up to five (5) points for virtually any non-conducting liquid.

Capacitance-based point sensing

The system consists of a Model 188CPS Point Sensing Instrument, plate sensors, and connecting cables. The instrument sensing elements are typically parallel plate capacitors which are mounted on a stainless steel support tube. The plate capacitors allow a non-c ondu cting liqui d (or ot her mat erial ) to become t he di elect ric between th e plates. The instrument measures the plate capacitance which is directly related to the percentage of the plate immersed in the non-conducting liquid.

The plate sensors are normal ly constructed i n diameters of 3.5" to 5" , howe v er , custom designs which require smaller diameter tank penetrations can be provided for specific needs. Up to five plate sensors can be monitored by a single Model 188CPS instrument. The support tube may also function as a cylindrical capacitor which may be used for continuous level measurement using a separate AMI level instrument.

Simple operation

The instrument is equipped with five tri-color LED’s which provide positive indication of immersed or exposed state for each point, as well as providing fault indications. No user input is required for normal operation of the instrument.

Remote monitoring

The Model 188CPS provides five relay contact pairs available through a terminal block located on the rear panel. When a plate sensor is immersed in the nonconducting liquid, the respective relay contact pair closes.

Introduction

2 3

Front Panel Layout

AMI

0RGHO &36

3RLQW 6HQVLQJ ,QVWUXPHQW

Power switch and indicator LED

LED indicators

Recessed calibration push-buttons

6(1625  6(1625  6(1625 

6(1625 

6(1625 

&$/,%5$7,21

0$;

0,1

Introduction

Rear Panel Layout

AMERICAN MAGNETICS, INC. OAK RIDGE, TN U.S.A.

OSC1

OSC2 OSC4OSC3

OSC5

115/230 VAC 50/60 Hz

SELECTOR SW. INSIDE

RELAY CONTACTS

12345

1 2

coaxial connectors to

BNC

oscillator units via the extension cables

Relay contacts terminal block (closed pair = immersed)

Input power connector

Introduction

System Diagram

REAR PANEL

AMERICAN MAGNETICS, INC. OAK RIDGE, TN U.S.A.

OSC1

OSC2 OSC4OSC3

RELAY CONTACTS

OSC5

12345

EXTENSION CABLES RG-59/U COAXIAL CABLE, 6 FT. LENGTH STANDARD (VARIABLE)

115/230 VAC 50/60 Hz

SELECTOR SW. INSIDE

OSCILLATOR CABLES RG-59/U COAXIAL CABLE, 6 FT. LENGTH SUGGESTED

FRONT PANEL

AMI

Model 188CPS

Point Sensing Instrument

MODEL 188CPS POINT SENSING INSTRUMENT

OSCILLATORS

SENSOR 5 SENSOR 4 SENSOR 3 SENSOR 2

SENSOR 1

CALIBRATION

MAX

MIN

Model 188CPS Point-Sensing System Diagram (not drawn to scale).

Introduction

System Diagram

Introduction

Specifications

Instrument Specifications

Input line voltage Input line frequency 50-60 Hertz, 1 phase Measurement accuracy Dimensions 3.8" H x 8.4" W x 11.1" D, Standard

Weight 4.0 lbs. Standard; 4.9 lbs. Rack Mount Operating environment 15 - 50°C non-condensing

115/230 or 100/200 VAC

0.25 inches

3.475" H x 19" W x 11.1" D, Rack Mount

10%

Relay Contact Specifications

Max switching VA 10 Max switching voltage 200 VDC Max switching current 0.5 A Max continuous current 1.5 A Dielectric between contacts 200 VDC minimum

Introduction

Manual Legend

Instruction manual symbol: the product is marked with this symbol when it is necessary for you to refer to the instruction manual in order to protect against damage to the product or personal injury.

Hazardous voltage symbol.

Warning

The Warning sign denotes a hazard. It calls attention to a procedure or practice, which if not correctly adhered to, could result in personal injury. Do not proceed beyond a Warning sign until the indicated conditions are fully understood and met.

Caution

The Caution sign denotes a hazard. It calls attention to an operating procedure or practice, which if not adhered to, could cause damage or destruction of a pa rt or all o f the pr oduct. Do not pr oceed bey ond a Caution sign until the indicated conditions are fully understood and met.

+ 20 hidden pages