26550007 Rev. 3 Geotech Signal Manager OBS

Geotech_Signal_Manag.. Geotech_Signal_Manager

Geotech_Signal_Manag.. Geotech_Signal_Manager_Rev_11_28_08

User Manual: Pdf OBS Geotech Signal Manager

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Signal Manager

Installation and Operation Manual

Rev.11/28/2008 Part # 26550007

Table of Contents

CHAPTER 1:

SYSTEM DESCRIPTION ............................................................ 3

FUNCTION AND THEORY ....................................................................................... 3
CHAPTER 2: SYSTEM INSTALLATION ............................................................. 4
HARDWARE INTERFACE ........................................................................................ 4
CHAPTER 3: SYSTEM TROUBLESHOOTING................................................... 6
CHAPTER 4: SYSTEM SPECIFICATIONS ......................................................... 7
CHAPTER 5: SYSTEM SCHEMATIC .................................................................. 8
CHAPTER 6: REPLACEMENT PARTS LIST...................................................... 9
THE WARRANTY................................................................................................ 10
EQUIPMENT RETURN POLICY ......................................................................... 10
EQUIPMENT DECONTAMINATION................................................................... 10

1

DOCUMENTATION CONVENTIONS

This uses the following conventions to present information:

2

Chapter 1: System Description
Function and Theory
The Geotech Signal Manager has been designed to simplify fluid level
measurement and control when an application requires that two sensor
inputs be scaled and differenced to form one output representing an
accurate fluid level. This controller has been designed to operate in
harsh environments and includes protection on all inputs and outputs to
minimize system down time.
FEATURES:
•
•
•
•
•
•
•
•
•
•

Dual 4-20 mA current loop inputs
Advanced noise filtering and input protection
Failed sensor detection
4-20 mA current output
Dry contact output
Reverse voltage protection
Over voltage protection
Simple to use
Low cost
Operates with sealed gauge or absolute sensors

Figure 1 depicts a simple application for the current differencing
controller. Two absolute or sealed gauge pressure sensors are used, one
to sense fluid pressure and one to sense gas pressure. The sensor
outputs are fed into the Signal Manager, which performs the required
scaling and control functions for the system.

3

Chapter 2: System Installation
Hardware Interface
Refer to Figure 2 and the label on the Signal Manager for wiring
connections. The controller accepts two (2) 4-20mA inputs from loop
powered sensors. These sensors should include a shield to minimize
interference from external sources. In order for the shields to be
effective, a #14AWG ground wire needs to be run from the end sensor
terminal block connection position to a good earth ground. Keep this wire
as short as possible.
Connect the power supply inputs to the correct positions on the IO
terminal block. These inputs are reverse voltage protected; however,
care should be taken to connect the wiring correctly. See Signal Manager
specification for acceptable input supply voltage range.
The 4-20mA output is a current source output that may be used to
monitor the difference between the two input channels.

4

Figure 2

5

Chapter 3: System Troubleshooting
Status LED’s
Problem:
Indicates that power is applied and CPU is operational.
Solutions:
1) Status LED for sensor “0” input. Illuminated for valid current loop.
2) Status LED for sensor “1” input. Illuminated for valid current loop.

Problem :
CPU LED not lit
Solutions:
1) Check DC supply wiring
2) Check DC supply level

Problem:
S0 or S1 LED’s not lit
Solutions:
1) Check sensor wiring
2) Cross inputs to verify problem with one sensor
3) Check loop current with multimeter
4) Replace sensor

6

Chapter 4: System Specifications
Maximum Ratings:
Supply voltage

24

VDC

12-24
25
4-20
30
4-20
4-20
12
12
0.1
0.5

VDC
mA
mA
Hz
mA
mA
bit
bit
%
% Full scale

-40°→60°
5 to 95%
4x3x2
7

C
Relative NC
Inches
Ounces

Performance:
Supply voltage
Quiescent supply current
Output current (A – B×kscale)
Controller bandwidth
Channel A input
Channel B input
Input resolution
Output resolution
Channel A & B input accuracy
Overall accuracy
Environmental:
Operating temperature
Humidity
Size
Weight

7

Chapter 5: System Schematic

Figure 8
Outline Dimensions

8

Chapter 6: Replacement Parts List
Signal Manager Control
Operation Manual

PN 86550006
PN 26550007

9

The Warranty
For a period of one (1) year from date of first sale, product is warranted to
be free from defects in materials and workmanship. Geotech agrees to
repair or replace, at Geotech’s option, the portion proving defective, or at
our option to refund the purchase price thereof. Geotech will have no
warranty obligation if the product is subjected to abnormal operating
conditions, accident, abuse, misuse, unauthorized modification, alteration,
repair, or replacement of wear parts. User assumes all other risk, if any,
including the risk of injury, loss, or damage, direct or consequential,
arising out of the use, misuse, or inability to use this product. User
agrees to use, maintain and install product in accordance with
recommendations and instructions. User is responsible for transportation
charges connected to the repair or replacement of product under this
warranty.

Equipment Return Policy
A Return Material Authorization number (RMA #) is required prior to
return of any equipment to our facilities, please call 800 number for
appropriate location. An RMA # will be issued upon receipt of your
request to return equipment, which should include reasons for the return.
Your return shipment to us must have this RMA # clearly marked on the
outside of the package. Proof of date of purchase is required for
processing of all warranty requests.
This policy applies to both equipment sales and repair orders.
FOR A RETURN MATERIAL AUTHORIZATION, PLEASE CALL OUR
SERVICE DEPARTMENT AT 1-800-833-7958 OR 1-800-275-5325.
Model Number: ________________
Serial Number: ________________
Date:

________________

Equipment Decontamination
Prior to return, all equipment must be thoroughly cleaned and
decontaminated. Please make note on RMA form, the use of equipment,
contaminants equipment was exposed to, and decontamination
solutions/methods used.
Geotech reserves the right to refuse any equipment not properly
decontaminated. Geotech may also choose to decontaminate equipment
for a fee, which will be applied to the repair order invoice.
10

Geotech Environmental Equipment, Inc
th
2650 East 40 Avenue Denver, Colorado 80205

(303) 320-4764 ● (800) 833-7958 ● FAX (303) 322-7242
email: sales@geotechenv.com website: www.geotechenv.com



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