Vega DSGH User manual

Quick Reference Guide
DSGH®
Radiation-Based Detector with GEN2000®
Electronics for Density Measurement
Document ID:
31524
Nuclear

Revision History
Revision History
Version of manual
Description
Date
1.0
Initial release
051025
1.1
Electronics revision
090306
1.2
Added perforated view for ground - Wiring
090811
1.3
Changed company name, logo, and website
110301
1.4
Removed one point calibration
111121
1.5
Changed page layout to A5
130403
This document contains proprietary information of VEGA Americas, Inc. It shall not be
reproduced in whole, or in part, in any form, without the expressed written permission of
the VEGA Americas, Inc.
The material in this document is provided for informational purposes only and is subject
to change without notice.
ISO 9001 approval by Lloyd's Register Quality Assurance Limited, to these Quality
Management System Standards: ISO 9001:2000, ANSI/ASQC Q9001-2000, Approval
Certificate No. 107563.
3

Notes
NOTES
4

Table of Contents
Table of Contents
Revision History ................................................................................ 3
Table of Contents .............................................................................. 5
Wiring ................................................................................................. 7
Current Loop Output...................................................................................... 9
Auxiliary Input Frequency Signal ................................................................... 9
Relay ............................................................................................................. 9
RS-485 ........................................................................................................ 10
Setup and Calibration ..................................................................... 11
Current Loop (analog output calibration) ..................................................... 11
Set up 4 mA ........................................................................................................ 11
Set up 20 mA ...................................................................................................... 11
Select Linearity ................................................................................................... 12
Calibrate Gauge.................................................................................................. 12
Maintenance and Diagnostics ........................................................ 15
Alarm Types ................................................................................................ 15
Gauge Status............................................................................................... 16
Diagnostic Screens in Ohmview 2000.............................................................. 16
Acknowledge Diagnostic Alarms......................................................................... 16
Diagnostic Alarm Messages and Conditions....................................................... 16
Troubleshooting........................................................................................... 19
Test points .......................................................................................................... 19
LED Indicators .................................................................................................... 20
Field Repair Procedures.............................................................................. 22
Replace CPU or Power Supply Board ................................................................. 23
Periodic Maintenance.................................................................................. 23
Customer Service............................................................................ 24
5

Notes
NOTES
6

Wiring
Wiring
Follow the diagram and the steps below for wiring connections.
1. Make connections at the removable terminal strips mounted on the power board.
2. Access the power board by removing the explosion-proof housing cap.
3. Connect the power earth ground wire with the internal and external ground screw.
4. Access the ground screws by removing the top cover.
Interconnecting Terminals – GEN2000 HART
1Power In (L)
2Power In (N)
3Relay Normally Open (NO)
4Relay Common (C)
5Relay Normally Closed (NC)
6Frequency +
7Frequency -
8+ 6V Auxiliary Input Power (Not used in HART Applications)
9Common
10 -6V Auxiliary Input Power
11 Auxiliary Input Frequency Signal +
12 Auxiliary Input Frequency Signal -
13 Current Loop Output +
14 Current Loop Output –
7

Wiring
DSGH Exploded View
1Power Supply Board
2CPU Board
DSGH Perforated View
1Customer Earth Ground and Ground to Housing
Do not apply power until thoroughly checking all the wiring. Not all
connections are required for operation. For example, Terminal 10
(
-6V, Auxiliary Input Power) may not be used with newer electronics. The
power input terminals are not polarity
-sensitive.
8

Wiring
•The AC power source voltage input is 100 - 230 VAC ±10% (90 - 250 VAC) at 50/60
Hz, at 15 VA (or 25 VA with optional heater) maximum power consumption.
•Do not share the AC power with transient-producing loads. Use an individual AC
lighting circuit. Supply a separate earth ground.
•The DC power source voltage input is 20–60 VDC (<100 mV, 1/1,000 Hz ripple) at
15 VA maximum power consumption. DC power cable can be part of a single cable
4-wire hookup, or can be separate from output signal cable.
•Wire must meet power per local code.
•Use wire suitable for +40 °C (104 °F) above surrounding ambient temperature.
•All field wiring must have insulation suitable for 250 volts or higher.
Not all connections are required for operation. The power input terminals are
not polarity-sensitive. The HART signal may not operate with some isolating
barriers or other non-resistive loads.
Current Loop Output
The current loop output signal is 4 … 20 mA into 250 - 800 Ωload. Pin 13 is positive (+)
and Pin 14 is negative (-). HART communication protocol (BEL202 FSK standard) is
available on these connections. The output is isolated to standard ISA 50.1 Type 4
Class U.
When using signal (4 … 20 mA output) cables (customer supplied), they must meet
these specifications:
•Maximum cable length is 3,280 ft. (1,000 m)
•All wires should be per local code
When using DC power, the signal and power can run on a single cable 4-wire hookup (2
wires for power, 2 wires for 4... 20 mA).
Auxiliary Input Frequency Signal
Frequency input signal is 0/100 kHz ≤, true digital.
Relay
Relay contacts are rated at 6 A at 240 VAC, 6 A at 24 VDC, or 1/4 HP at 120 VAC.
Frequency input signal is 0/100 kHz ≤, true digital.
9

Wiring
RS-485
The CPU board contains clearly labeled RS-485 connections. Use shielded wire per
local code at a maximum length of 2,000 ft. (609 m).
1. Connect positive terminals together.
2. Connect negative terminals together.
3. Connect ground terminals together.
10

Setup and Calibration
Setup and Calibration
Before using the gauge to make measurements, you must:
•Calibrate it to relate the detection of radiation from the source to the level of the
process material.
•Calibrate the current loop to a reference ammeter or the DCS.
Current Loop (analog output calibration)
Before completing a current loop calibration:
1. Connect an ammeter anywhere along the current loop (in series).
2. Make sure there is a 250 - 800 Ωload on the current loop. If no load or an
insufficient load exists on the loop, it may require temporary placement of a resistor.
3. Hook the meter in series with the load resistor.
4. Open Ohmview 2000
Perform the following steps to calibrate the current loop.
Set up 4 mA
1. Click Calibration, Current Loop Cal.
2. Click Execute.
3. Click OK.
4. Read the ammeter and enter the actual milliamp reading.
5. Click OK.
6. Click YES if the ammeter reads 4.00 mA or NO for any other reading.
7. Repeat until the meter reads 4.00 mA.
8. Read the ammeter and enter the actual milliamp reading.
9. Click OK.
10. Click OK.
Set up 20 mA
1. Read the ammeter and enter the actual milliamp reading.
2. Click OK.
3. Click YES if the ammeter reads 20.00 mA or NO for any other reading.
4. Repeat until the meter reads 20.00 mA.
5. Read the ammeter; enter the actual milliamp reading.
6. Click OK.
7. Click OK.
11

Setup and Calibration
Select Linearity
The majority of density applications use the equation linearizer to calculate the process
value. For density applications, the equation is the default and we recommend it in most
circumstances. If the results from the equation linearizer method are not satisfactory,
contact VEGA Field service to explain the other options. The linearizer equation
calculates a density reading for a given count reading at the detector. To make the
correct calculation, it relies on the following information:
•Vessel’s inner diameter system parameter
•Span settings parameter
•Source type parameter
•Data used in the initial calibration
•Absorption co-efficient
For information on linearity options, see the DSGH Installation and Operation Guide.
1. Click Setup, Gauge Setup, Linearizer Type.
2. Click Equation.
Calibrate Gauge
To calibrate your gauge, you must complete the Standard Method (2-point) or the
Two-Point Process Calibration steps.
Standard Method (2-point)
1. Set the low density and collect Cal Low data.
2. Set the high density and collect Cal High data.
3. Collect the linearizer table data.
4. Calculate the linearity.
5. Calculate the calibration.
6. Perform the data collection steps in any sequence, depending on your ability to
empty and fill the vessel.
To perform a calibration you must complete the following:
1. Click Equation from the Setup, Gauge Setup tab.
2. Check that the parameters (vessel inner diameter, engineering units, measurement
span, and source type) are correct.
3. Start the gauge 4 hours before start of calibration.
4. Fill vessel or pipe with process.
5. Prepare to draw a sample while the gauge is collecting data.
6. Measure a process sample with the density gauge and enter the actual density.
12

Setup and Calibration
The accuracy of the calibration depends upon the accuracy of the sample.
Obtain an accurate reading, from a laboratory, of the sample read by the
gauge.
Two Point Process Calibration (Preferred Method)
You must provide the high and low process conditions when performing a two-point
calibration. If using the standard method, record both the sensor counts and levels at
each step:
Set Low Density
1. Click Calibration, 2 Point Calibration, Cal Low Collect.
2. Click Start.
3. Click Accept.
4. Enter the actual process value (from the laboratory) in engineering units.
5. Click OK.
Set High Density
1. Click Calibration, 2 Point Calibration, Cal High Collect.
2. Click Start.
3. Click Accept.
4. Enter the actual process value (from the laboratory) in engineering units.
5. Click OK.
Collect Linearizer Table Data
1. Click Calibration, Linearizer Data Pt, Create Data Point.
2. At the prompt, enter the known process value.
3. Accept or reject the results when they appear.
4. Repeat the procedure for all available values
Calculate Calibration
1. Click Calibration, 2 Point Calibration.
2. Click Calculate Results.
3. Click OK.
4. Click OK.
13

Notes
NOTES
14

Maintenance and Diagnostics
Maintenance and Diagnostics
The transmitter system alerts you to detector problems by:
•Posting messages on the Ohmview 2000 message screen.
•De-energizing the output relay.
•Distinctly changing the current loop output.
•Tracking the current status and history in the Gauge status screens.
Alarm Types
Name
Description
Diagnostic
Diagnostic alarm provides information about level gauge system and alerts users
when periodic procedures are due.
Analog
Analog alarm sets the current loop mA to 2 mA or 22 mA when detector outputs zero
(0) counts.
If analog alarm is on, check the following:
•Is source holder shutter in On or Open position to create the required radiation
field?
•Is there extreme build-up on walls or other material that is shielding detector
from radiation field?
•Are electrical connections from sensor assembly to CPU board damaged or
disconnected?
Process
Process alarm triggers when process level is above or below a set point (high limit or
low limit).
Enter choice of low or high limit and set point on Alarm | Relay Setup tab. This
alarm only works for output relay.
The gauge acknowledges or resets process alarm when process value returns to set
point value.
X-ray
X-ray alarm changes current loop mA output in response to marked increase in
radiation field. This change prevents control problems when external radiographic
sources are in the area during vessel inspections. Gauge sets current loop output at
value measured 10 seconds before condition. Gauge cycles until radiation field is
back to normal level or until a time-out period of 60 minutes passes.
15

Maintenance and Diagnostics
Excessive radiation fields at the detector can permanently damage the
gauge. The device has a protection feature that safeguards against
excessive radiation fields. The procedure for activating this protection is
firmware dependent. Please consult the factory to activate this feature on
your device.
Alarm Output
Diagnostic
Analog
Process
X-ray
Option to trigger relay
√
√√
Display HART message Optional
Current loop output affected
√
√
Gauge status and gauge history
√
Gauge Status
Diagnostic Screens in Ohmview 2000

•To check the system’s present status, click Diagnostics, Diagnostics tab.
•For historical information, click the Diagnostic History and STDZ History tabs.
Since some conditions are self-repairing such as RAM and EEPROM corruption, these
conditions may appear in history screens, but not in diagnostic screens.
Acknowledge Diagnostic Alarms
Diagnostic alarms turn off when the problem resolves except for the following reasons:
•Source wipe due
•Shutter check due
•Standardize due
If the relay is set as a diagnostic alarm, you must acknowledge all diagnostic
alarms to reset the relay.
Diagnostic Alarm Messages and Conditions
View active alarm messages on the Ohmview 2000 menu. Use the Alarms, Diagnostic
Alarm Enable tab to select alarm messages.
16

Maintenance and Diagnostics
When a HART device initially connects to the gauge, any conditions in alarm appear.
Condition
Description
Action
RAM Status -
Pass/Fail
RAM corrupt/RAM memory corruption
occurred and resolved internally.
Repeated triggering of alarm suggests
hardware problem.
Consult VEGA Field Service.
Sensor EEPROM -
Pass/Fail
Sensor EEPROM corrupt/ Critical
memory corruption occurred on
sensor pre-amp board EEPROM may
not be resolved internally. If alarm
recurs, suggests hardware problem.
Check for recurrence by
acknowledging alarm. Cycle power
to unit.
If it recurs, contact VEGA Field
Service.
Real Time Clock
Status - Pass/Fail
Real time clock failed/Can cause
miscalculation of timed events.
Reset time and date. Contact VEGA
Field Service if clock does not reset.
Note: If gauge has been without
power for 28 days or greater, you
must reset clock.
Sensor Temp
Probe - Pass/Fail
Sensor temp probe fail/Sensor
temperature probe may not be
functioning, which results in
erroneous measurements.
Verify sensor temperature on
Diagnostics, Process Chain tab. If
temperature reads - 0.5 °C (+31 °F)
constantly, probe may be broken and
CPU board may need replacement.
Contact VEGA Field Service.
Source Wipe Due -
No/Yes
Source wipe due Perform source wipe. Log shutter
check on Source Functions tab.
CPU EEPROM -
Pass/Fail
CPU EPPROM corrupt/Critical
memory corruption occurred on CPU
board EEPROM may not be resolved
internally.
If alarm recurs, suggests hardware
problem.
To check for recurrence,
acknowledge alarm. Cycle power to
unit.
If it recurs, contact VEGA Field
Service for advice.
Sensor Status -
Pass/Fail
Sensor fail/ Less than 1 count seen in
last 10 seconds (configurable by Field
Service.) Indicates sensor is
malfunctioning.
Contact VEGA Field Service.
17

Maintenance and Diagnostics
Sensor Voltage
Status - Pass/Fail
Sensor high voltage fail/High voltage
on PMT is outside usable range.
Contact VEGA Field Service.
Standardize Due -
No/Yes
Standardize Due
Perform a new standardization
procedure.
Shutter Check Due
- No/Yes
Shutter Check Due
Perform shutter check. Acknowledge
on Source Functions tab.
New Hardware
Found - No/Yes
New hardware found?/CPU board
detects configuration mismatch. CPU
board or sensor assembly may have
been replaced or one of EEPROM
configurations is incorrect.
Contact VEGA Field Service first. If
they concur, click Diagnostics, New
Hardware, No New Hardware and
click OK.
Process Out of
Range - No/Yes
Process out of measurement
range/Current process value is not
within limits set by Max level and Min
level in gauge span settings.
Contact VEGA Field Service.
X-Ray Alarm -
No/Yes
Note that there are high levels of x-ray
radiation in area that can affect
process measurement.
Contact VEGA for more information.
18

Maintenance and Diagnostics
Troubleshooting
Two circuit boards are field-replaceable.
Power Supply Board and CPU Board
Test points
Power Supply Board
Label
Description
H1 HART connection
H2
HART connection
TP1
Isolated ground
TP2
Loop current test point 200 mV/mA loop current, referenced to isolated ground
19

Maintenance and Diagnostics
CPU board
Label
Description
Count Raw input signal coming from the preamplifier
GND
Logic ground
U5 pin 8
+5V power supply test point, referenced to logic ground
Jumpers
Jumpers JP1 and JP2 on the power supply board set the current loop source or sink
mode. The gauge does not use jumpers J1 through J4 on the CPU board.
Do not change the jumpers from the current setting without calling VEGA
Field Service.
Mode
Gauge Current Loop
Jumper Setting
Source mode
Self-powered
JP1 Pins 1-2, JP2 Pins 2-3
Sink mode
DCS-powered
JP1 Pins 2-3, JP2 Pins 1-2
LED Indicators
Power Supply Board
LED
Description
Normal
Condition
Error Condition
Recommendation
+6V
+6V DC
voltage level to
electronics
ON
OFF - electronics
are not receiving
+6 V DC required
for functioning
Verify +6 V on pin 8 of terminal strip
(Pin 9 can be used as ground
reference. Check fuse on power
supply board. Check power input
terminals 1 and 2.
+24V
Analog output
loop voltage
ON
OFF - 24 V not
present on 4 ... 20
mA output and
HART
communications
Check loop wiring and jumpers JP1,
JP2 on power supply board.
Replace power supply board.
20