How do I perform the Mechanical Installation of my AMETEK Gulton Statham Pressure Transmitter?
The location should be selected to allow direct access for adjustment or re-calibration while in service. The zero and span magnets should always be accessible. Also, the transmitter should be removable in the event shop servicing is required. Consideration of optional equipment should also be made. For example, if a meter/junction box is incorporated, it must be accessible for convenient viewing and wiring. From the model number on the ID plate a user can determine the options that have been included with the pressure transmitter to be installed.
Proper location of the transmitter with respect to the process measurement is critical for accurate pressure measurements. For non-condensing gases, the transmitter should be located above the process taps. For liquid or condensing gases, the transmitter should be located below the process taps. Other general considerations should include:
Impulse tubing should be kept as short as possible and of sufficient diameter to avoid friction loss.
Slope impulse piping at least 1 (one) inch per foot up toward the process connections for non-condensing gas.
Slope impulse piping at least 1 (one) inch per foot toward the process connections for liquid or steam.
Ambient temperature extremes or fluctuations should be avoided.
Sediment should be kept from depositing in the impulse tubing.
The transmitter should be isolated from hot or corrosive process fluids.
In dry leg applications, possible condensation in the impulse piping should be avoided.
For steam service, impulse tubing should be filled with water to prevent contact of live steam with the transmitter.
NON-CONDENSING GAS INSTALLATION
1. Mount the transmitter such that the impulse piping connection is made from below the transmitter.
2. Ensure there are no low spots in the impulse piping between the process taps and transmitter connection.
3. Slope the impulse piping at least one (1) inch per foot down toward the process taps.
Install valving between the process taps and transmitter to permit static equalization (zero adj.) and process shut off.
LIQUID OR CONDENSING GAS INSTALLATION
1. Mount the transmitter such that the impulse piping connection is made from above the transmitter.
2. Ensure there are no vapor traps in the impulse piping between the process taps and transmitter connection.
3. Slope the impulse piping at least one (1) inch per foot upward to the process taps.
4. Install valving between the process taps and transmitter to permit static equalization (zero adj.) and process shut off
Process tubing should be installed so it will not produce added mechanical stresses on the transmitter during seismic disturbances. This is often accomplished with the use of stress-relief loops in the process tubing or by separately supporting the process tubing close to the transmitter.
How do I perform the Electrical Installation of my AMETEK Gulton Statham Pressure Transmitter?
Our pressure transmitters are supplied with one of five possible electrical terminations:
CODE 2. Three-wire 16 AWG
BLACK WIRE – Positive
WHITE WIRE – Negative
GREEN WIRE – Ground
CODE 6 Molded Submersible Service Cable, 3-conductor, 16 AWG, Neoprene Insulated
CODE 8 Electrical accessory connected to transmitter at the factory
CODE 0 3-Conductor cable, 18AWG, Teflon Insulated
Wiring the Transmitter
The power supply requirements range from +12 VDC at no load to +55 VDC (non-hazardous location) at a maximum 2150 ohms load. All power to the transmitter is supplied over signal wiring. No additional wiring is required. Shielded twisted pairs or shielded cable provide the maximum noise immunity. When using shielded cable, make sure only one end is grounded (see Figures 4.1 and 4.2). Under no circumstance should the transmitter signal wiring be placed in the same conduit with AC power circuits.
A single transmitter or multiple transmitters may be connected to a +DC power supply providing that the type of wire, length from the transmitter, and line resistance are taken into consideration. Make sure the power supply used has a minimum voltage (AC) ripple and meets your requirements to overcome voltage drop (line loss) and current loss in your closed loop circuit. The negative side of the power supply should be grounded. Do not exceed the specified load limitations of the transmitter for a particular power supply voltage.
How do I perform the Calibration of my AMETEK Gulton Statham Pressure Transmitter?
For Field or Shop calibration, a dummy load resistor may be substituted for the receiving instrument. The dummy load (a 250 ohm precision resistor) is installed in series with the loop. A digital multimeter or VOM is connected to read the output across the dummy load. A pressure source of known accuracy should be connected to the process or pressure connection of the transmitter.
1. Apply the desired zero reference pressure or vacuum. Adjust zero to indicate 4.00 mA. To decrease the output, turn the ZERO SCREW CCW (Counter Clock Wise); increase output, turn the screw CW (Clock Wise). Adjustment of the zero output will have no interaction with the span output.
NOTE: For suppressed zero calibrations, a pressure equivalent to the anticipated Zero Suppression is applied to the process connection.
For elevated zero calibrations, vacuum equivalent to the anticipated Zero Elevation is drawn on the process connection.
2. Pressure equivalent to the maximum span is then applied and the span adjusted to indicate 20.00 mA. Turn the SPAN SCREW CW to decrease output and CCW to increase output. Adjustment of the span output will have no interaction with the zero output.
In the event of a transmitter malfunction, the procedures listed below will assist in isolating the problem and its source. These procedures will also help in determining whether the fault can be corrected on site. The information is intended to assist in diagnosis of 3 primary malfunction symptoms. Under each symptom, checking procedures are listed for conditions most likely to result in the malfunction. To expedite the trouble shooting process, select the symptom most closely resembling the unit's apparent malfunction and use the information in this manual. Start with the most likely and easiest to check conditions.
No Output or Low Output Signal
Check for shorts and multiple grounds in loop wiring
Check polarity of connections
Check loop impedance
Check for entrapped gas in liquid lines
Check transient suppressor (if used) for 1 megohm or greater resistance to ground from each lead
Check for adequate voltage to transmitter
High Output Signal
Check output of power suppl>
Check transmitter connections
Check to see if block and bleed valves are fully open
Check for entrapped gas in liquid lines, and entrapped liquid in gas lines
Check for sediment, or other blockage, in the impulse lines to the transmitter
Check for intermittent shorts, open circuits, and multiple grounds in loop wiring
Check piping for entrapped gas in liquid lines or for liquid in dry lines
Check for adequate voltage to transmitter
Damaged or defective transmitters should be returned to AMETEK Gulton-Statham for repair.
What information do I need for ordering AMETEK Gulton Statham Industrial Pressure Transmitters?
Note: Please review AMETEK Gulton Statham's Catalog Sheets which are available on this Website, or from your local AMETEK Gulton Statham Representative/Distributor.
1) Please describe the specific application in which the transmitter will be used (please provide a sketch or drawing of the installation).
2) What is the Calibrated Range and Engineering Units for the transmitter (e.g. 0-500Psig)?
3) What is the required Accuracy for the transmitter?
4) What is the Maximum Safe Working Pressure the transmitter will see?
5) What is the Chemistry of the Media that the transmitter will be exposed to (Percentages by Volume)?
6) What is the Media Temperature (Min/Max)?
7) What is the Operating Temperature for the transmitter (Min/Max)?
8) What Environmental Conditions will the transmitter be exposed to (Humidity, Corrosive Elements, Vibration, etc.)?
9) What type of Electrical Connection is required (Junction Box, Flying Leads, Cables, etc)?
10) What is the Input Voltage for the application? 12-30VDC (hazardous Locations) 12–55 VDC (non-hazardous locations)
11) What is the approximate cycle time of the system? (day/month/year)