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We do Your Level Best

 

 

 

 

 

We Do Your Level Best 

The LD31 Series DeltaSpan consists of a piezoresistive sensing element, encased in 
316 SS housing. Superior lightning and surge protection utilizing dual arrestor 
technology, grounded to case, eliminates both power supply surges and lightning 
ground strike transients. Bullet nose design protects diaphragm from damage.  

The LD32 Series DeltaSpan consists of a piezoresistive sensing element, encased in 
316 SS housing. It is perfect for wastewater and slurry applications with features to 
protect the unit from these demanding applications. Superior lightning and surge 
protection utilizing dual arrestor technology, grounded to case, eliminates both power 
supply surges and lightning ground strike transients. Large diameter 316 SS 
diaphragm seal is non-clogging and damage resistant to floating solids. 

Both units come equipped with a 270-pound tensile strength, shielded, vented cable. 
Ventilation tube in the cable automatically compensates for changes in atmospheric 
pressure above the tank. The vent tube has a filter attached to the end that will block 
particles, such as dust, dirt, and water droplets, from entering the tube. 

This Quick Start includes everything you’ll need to get the DeltaSpan up and running. 
For complete information, please refer to DeltaSpan documentation located at 

www.flowline.com

Compensated Temperature Range 

LD31 

  0  to 140° F  ( -18 to 60° C) 

LD32 

  0  to 180° F  ( -18 to 82 °C) 

 

Pressure Range 

Max.  Distance Measured

11.5’ / 3.5M 

10 

28’ / 7.4M 

15 

34’ / 10.5M 

20 

46’ / 14.0M 

 

Electrical Installation 

An external power supply delivering 13-30 VDC with minimum current 
capability of 40 mA  DC (per transmitter) is required to power the control 
loop. The Current Output diagram (shown below) shows the connection of 
the power supply, transmitter and receiver. 

 

 

 

 

 

 

 

 
The maximum receiver load resistance (RLmax) for the DC power supply 
voltage (Vsup) is expressed by the formula: RL Max = 

V sup - 13V 

 

 

 

 

 

 

                  0.02A 

Shielded cable should always be used for control loop wiring. 

Maximum Loop Resistance is 850 ohms @ 30 VDC. 

 

Troubleshooting  

I

f you face any issues not addressed in this quick start, please refer to the 

DeltaSpan Manual located on Flowline website at 

www.flowline.com

.

  

 

Safety Concern 

Where personal safety or significant property damage can occur due to a spill, the 
installation must have a redundant backup safety system installed. 

Welcome to the DeltaSpan Quick Start 

The DeltaSpan Quick Start is meant to show some of the more common setup solutions 
to getting the DeltaSpan up and running quickly. If you run into an issue that is not 
addressed here or wish to install or set up with a non-standard configuration, please 
address the DeltaSpan Manual or refer to the Flowline website at 

www.flowline.com

Current Output 

 

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