Setra 595 Operating Manual

Adding a Site Offset to SDI12 Output

In some applications it is necessary to measure a site value including some
reference data point, for example sea level. Assuming the sensor is installed 10m
above sea level, then it is possible to have all reported readings add 10m, thus
acquiring the data without the need for further modification. To add a site offset
then:

1. Determine the offset to be applied.

2. Add the offset to the pressure units (e.g. aXU1,10!)

3. Save new calibration to nonvolatile memory (e.g. aXS0!)

4. Verify sensor now measures 10m for 0 applied pressure.

10. WARRANTY

The company warrants its products to be free from defects in material and
workmanship in normal use and service for a period of two years from date of
shipment. The Company reserves the right and option to repair or replaceupon
evaluation of the returned original part. Modification, misuse, attempted repair by
others, improper installation or operation shall render this guarantee null and
void. The Company makes no warranty of merchantability or fitness for a part or
purpose.

11. Servicing

The transducer cannot be repaired locally and if damaged should be returned to
ourselves at the address shown below when a replacement/repair is required.

Setra Systems, Inc.
159 Swanson Road
Boxborough, MA 01719
Attn: Repair Department

Model 595 Slimline

Submersible Pressure Transducer

12. Return to Factory

PLEASE NOTE: All returns must be accompanied with Setra’s “Calibration and
Service Order” return form. The form can be downloaded at:

http://www.setra.com/tra/repairs/pdf/webrepair.pdf

Any instrument returned without Setra’s authorized form completely filled out
will be quarantined and no action will occur. It may ultimately be returned to you
and subject to a transportation charge.

159 Swanson Road, Boxborough, MA 01719/

Toll Free: 800-257-3872/ Phone: [phone]/

Fax: [phone]/Email: [e-mail]/Web: www.setra.com

ISO

9001:
2000

Certified

✓

Setra Systems, Inc.

Contents

1.0 Introduction ........................................................................................................................... 3

2.0 Safety Instructions ................................................................................................................. 3

3.0 Hazardous Products ............................................................................................................... 3

4.0 GENERAL ................................................................................................................................ 3

5.0 Action on Receipt ................................................................................................................... 4

To re-range the 595 sensor proceed as follows:

1. Determine the 595 sensor full scale and the user application full scale.

2. Find the required calibration gain. Divide the 595 sensor full scale by the user
application full scale (e.g. 10/4)

3. Program the calibration gain into the sensor (via SDI12 interface).
(e.g. aXG2,2.5!)

4. Check the residual error with zero pressure applied. Note as the gain is in­creased any offset errors ban be magnified. So for example instead of 4mA
expected sensor reads 3.959mA.

5. Program offset in calibration of sensor to remove offset errors (e.g. aXA2,0.041!)

6. Save new calibration to nonvolatile memory (e.g. aXS0!)
7 Verify sensor now measures 4 to 20mA for required application range.

6.0 Installation ............................................................................................................................ 4

6.1 Lowering the Pressure Probe ......................................................................................... 4

6.2 Electrical Installation .....................................................................................................5

7.0 Operation ............................................................................................................................... 6

7.1 Analogue Output Probes ............................................................................................... 6

7.2 SDI12 Operation ............................................................................................................ 6

8. Maintenance ............................................................................................................................ 9

8.1 Self diagnostics ............................................................................................................. 9

8.2 Calibration Adjustment ............................................................................................... 10

8.3 Cleaning ...................................................................................................................... 14

9. Advanced Operation ............................................................................................................... 14

10. WARRANTY ......................................................................................................................... 16

11. Servicing ............................................................................................................................ 16

12. Return to Factory ................................................................................................................ 16

Configure a Reverse Output 20mA to 4mA.
If your application demands a 20mA output with zero applied pressure and 4mA
output for full scale applied pressure then the sensor output can be reversed by
sending the following SDI12 commands:

1. Set calibration gain of mA output to -1 (e.g. aXG2,-1!)

2. Set calibration offset of mA output to +24 (e.g. aXZ2,24!)

3. Save new calibration to nonvolatile memory (e.g. aXS0!)

4. Verify sensor now measures 20mA to 4mA for 0 to full scale applied
pressure.

Applying a Filter to the mA Output
In applications that are inherently difficult to measure, for example waves on
reservoir, then the 595 can be configured to apply a mean or median filter via the
SDI12 interface before updating the analogue mA output. The filter command is
described below:

SDI12 Command: 0XFt,nn,xxxx!
Neptune Response: 0t,nn,xxxx<CR><LF>

Where:

T = type of filter
0 = MEAN
1 = MEDIAN
nn = number of values to filter, maximum 12

xxxx = 220ms intervals between measurements, maximum period 1
hour
To apply a filter:

1. Determine the type of filter and period suitable for the application.

2. Send the filter command to the 595 sensor (e.g. 12 reading mean, sampling
period 15 minutes, aXFt,12,4091A)

3. Save the filter to nonvolatile memory (e.g. aXS0!)

4. Verify the filter performance in applications.

8.3 Cleaning

Inspection and cleaning of the product is recommended as part of a
preventative maintenance procedure. The required inspection period will depend
on the nature of the application environment. To inspect the product unscrew
the nose cover. Figure 2, and view the sensor diaphragm. The housing should be
free from deposits. Cleaning with a cotton bud (Q-TIP) is possible, but extreme

care must be taken not to deform the sensor diaphragm during cleaning.

Figure 2

Inspecting and Cleaning the Sensor

9. Advanced Operation

The 595 allows for a number of advanced operations not normally
available.

Re-Range 4 to 20mA Output
Often users wish to measure a specific water level that is not the same as the full
range output of the transducer. For example, if the sensor output was 10MH2O
and the user wishes to measure up to 4mH2O then without a down range feature
the output for the 10mH2O unit in the users applications would be 0 to 40% of
the range or 4 to 10.4mA. In this situation it is possible to use the SDI12 interface
to program calibration coefficients into the sensor to provide 4 to 20 mA for the 0
to 4mH2O application, with the 10mH2O sensor.

1.0 Introduction

Model 595 is a level measuring transducer for precise measurements of ground
and surface water levels. The transducer measures pressure and temperature
signals and, by compensating these measured values for temperature effects, the
relative density of water and the specific gravity in the users location, provide a
highly accurate and repeatable “true” level measurement. The resultant level is
available either as an analogue output or as a digital output

2.0 Safety Instructions

Important Note: Setra’s Model 595 pressure transducer is designed and manufac­tured in accordance with Sound Engineering Practice as defined by the Pressure
Equipment Directive 97/23/EC. Pressure transducer products designed to meet
the highest risk category “IV” of the Pressure Equipment directive are clearly
marked on the label by “CE0086”. Compliance is achieved through modules “B&D”.
No other products should be used as “Safety Accessories” as defined by the PED,
Article 1, Paragraph 2.1.3.

EMC: Model 595 conforms with the essential protection requirements of the EMC
Directive 89/336/EEC amended by certified type testing to EN 61000-6-3 and
EN61000-6-2. Conformity with the requirements of the CE mark only applies
when the installation conditions described in these instructions have been met.

3.0 Hazardous Products

The 595 may be classified as Electrical, Electro-Mechanical and Electronic equip­ment.

These products are tested and supplied in accordance with our published
specifications or individual special requirements that are agreed in writing at time
of order. They are constructed so as not to affect adversely the safety of persons
and property when properly installed, maintained and used by qualified person­nel, in the applications for which they were designed and manufactured. Refer to
installation and maintenance instructions for further details.

4.0 GENERAL

● Transducer should not be subjected to greater than maximum allowable
pressure range as defined on the transducer label.

● Transducer should not be subjected to mechanical impact.

● The effects of decomposition of unstable fluids should be considered by the

user when placing this device in service.

● Pressure range must be compatible with the maximum level being mea­sured.

● Pressure media must be compatible with the transducer wetted parts which
are:

UNS31803 Stainless Steel, BS En 10088-3:1995 No. 1.4462.
Polyurethane
Acetal

Nitrile