DIESSE Fluid Control level gauges and valves

Identify the gauge before selecting a replacement

Send the nameplate, assembly and component photographs. Include section count and connection positions. Identify whether you need glass, a valve or a complete gauge.

Copy the full designation with material codes and suffixes. For a new installation, provide a vessel drawing and viewing requirements. Link photographs to item numbers.

Glass dimensions and section length

DIESSE glass sizes 1–9 cover glass lengths from 115 to 340 mm with a thickness of 17 mm. Type A and type B identify different widths. Read the complete size designation together with the gauge model before preparing the replacement list.

The visible length, glass length and metal body length are different measurements. Provide them separately, or attach a dimensioned sketch showing the measurement points. For multiple sections, identify the number of identical sections and the number of glasses to replace.

Match the viewing principle to the application

A reflex gauge indicates the liquid boundary through optical contrast. A transparent design supports observation of colour or the interface between two immiscible liquids. Describe what the operator needs to observe so that the proposed construction addresses the actual process task.

If replacing a cloudy or damaged glass, state the fluid and operating conditions. For a transparent assembly, identify any protective shield already fitted. Keeping the glass, shield and gasket details together makes the maintenance scope clear in the purchase specification.

Define gaskets and maintenance quantities

Each glass requires a sealing gasket and a cushion gasket. A reflex section uses one glass, whereas a transparent section uses two. Calculate the list from the gauge construction and section count, rather than relying on an undefined request for one complete kit.

State the existing gasket code or the relevant parts drawing reference. Glass gaskets and valve packing belong to separate component families. Record the material suffix as well as the size, and keep each requested seal associated with the assembly where it will be installed.

Specify isolation and process connections

For a valve assembly, record the connection type, nominal size, material and orientation. Photographs of both connection points and a drawing of the mating parts are useful when the old marking is unreadable. Identify whether the request concerns a complete body or individual maintenance components.

Isolation, drainage and venting are different duties. List them separately and include the required operating handle or accessories. An instrument needle valve or manometer cock also needs its own connection arrangement; matching thread dimensions alone does not define the complete item.

Configure a magnetic gauge and float

Magnetic gauges are built to the customer’s specified connection centre distance. Supply this dimension together with liquid density, operating pressure, temperature and connection positions. These inputs define the selection task for a complete gauge and for a replacement float.

When requesting a float, include the installed gauge model and any marking on the old component. The external display photograph does not identify the internal float by itself.

List isolation valves, drain, vent, calibrated scale and electronic accessories as separate options in a new assembly request.

Choose discrete signals or continuous output

Define whether the control system needs a level limit event or a continuous measured value. TIM NSB 1240 provides limit switching, while DS LTM-MTU and DS LTM-MIU provide continuous measurement. Supply the required output and, for replacement work, the existing wiring diagram.

Record the measuring span, power supply and environmental conditions. For additional limit switches, locate the switching points relative to the process connections.

This connects the automation requirement to the actual mechanical arrangement and prevents an electronic accessory from being specified in isolation.

Tubular and weld-on installation details

For a tubular gauge, distinguish the glass tube dimensions from the overall assembly height. Identify the GR18 or MT18 cock arrangement and any external protective guard. A view of the existing installation helps show available space and the position of the connections.

The manufacturer identifies steam, vibration and impact exposure as restrictions for the glass tube construction. Include these conditions when proposing a new installation.

Weld-on RCW/TCW designs require the vessel drawing, wall material and installation details to be assessed with the party responsible for the vessel.

Prepare the process specification

Collect fluid name, density, viscosity, working and design pressure, and working and design temperature in one enquiry. Mark steam service, temperature changes and any interface observation requirement separately. Keep units beside every numerical value and identify the process point on the drawing.

A general catalogue pressure rating is not a substitute for the specification of a selected assembly. Material, connections and operating conditions must be considered together. For an existing boiler or tank, include the equipment model and the gauge reference from the original parts list.

Create a clear purchasing list

A useful enquiry table includes item number, complete designation, quantity and drawing or photograph reference. Separate glasses, gaskets, protective shields, valves and electronic accessories into individual rows. An existing manufacturer’s bill of materials can be attached directly.

If several gauges use identical parts, state the number of gauges and the contents of one maintenance set. If their configurations differ, preserve the connection to each nameplate. Indicate whether the purchase is for maintenance stock, an installed unit repair or a new equipment package.

Check the quotation and incoming items

Compare item descriptions, sizes, materials and quantities with the original enquiry before confirming an order. Any proposed configuration change should be visible as a separate line so that the agreed scope remains clear during purchasing and receipt.

On delivery, compare the package and component markings with the approved list. Inspect the packaging and the surfaces of fragile items, keeping documents associated with their item numbers. Installation and maintenance follow the instructions for the specific gauge.

For a discrepancy, provide the item reference and photographs of the marking and packaging.

Equipment and spare parts supply

Equipguo handles enquiries for DIESSE level gauges, instrument valves and maintenance components. Send a specification, an existing product code or a drawing through the enquiry form. The technical scope can begin with the information already available and be completed during selection.

State quantities, destination and delivery requirements. Identify priority shutdown items separately from routine stock.