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Bid Package 08 North Well Field - Garney Construction

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Colorado River Municipal Water District<br />

Raw Water Supply <strong>Well</strong> Sites<br />

Ward County <strong>North</strong> <strong>Well</strong> <strong>Field</strong><br />

2.6 PRESSURE TYPE LEVEL TRANSDUCER<br />

A.<br />

B.<br />

C.<br />

Provide submersible hydrostatic transducer and cable as required. The liquid level of the<br />

well shall be sensed by a submersible hydrostatic transducer. The transducer shall be a<br />

loop powered type to produce an instrumentation signal in direct proportion to the<br />

measured level in the well to generate a 4-20mA signal to be sent to the Level Relay<br />

Panel. The sensor shall be stainless steel<br />

1. Accuracy: 0.1% of full scale<br />

2. Ambient Operating Temperature: 5 to 30 Celsius (41 to 86 degrees F)<br />

Provide the required amount of manufacturer’s supplied interconnecting cable from the<br />

hydrostatic transducer to the level relay panel. See plans for location of the panel. Refer<br />

to section 11 97 00 “Submersible Pumps and Installation, Attachment A” for well depth.<br />

Contractor shall verify well depth with Engineer in writing prior to procuring transducer<br />

cable. Manufacturer’s supplied cable shall be one continuous cable. No splicing<br />

allowed. Cable shall be vented to compensate for barometric fluctuations.<br />

The sensor shall be mounted as shown on the Drawings. The submersible hydrostatic<br />

transducer shall be as manufactured by In-Situ model PXD, or approved equal.<br />

Quantity Tag Service Range<br />

21 LPE-____* <strong>Well</strong> Level<br />

0-100 psig<br />

(0-230 feet)<br />

*See table below for equipment tag associated with each well site<br />

<strong>Well</strong><br />

<strong>Well</strong><br />

<strong>Well</strong><br />

Tag<br />

Tag<br />

Site<br />

Site<br />

Site<br />

Tag<br />

D1 LPE-4010 D8 LPE-4<strong>08</strong>0 D15 LPE-4150<br />

D2 LPE-4020 D9 LPE-4090 D17 LPE-4170<br />

D3 LPE-4030 D10 LPE-4100 D18 LPE-4180<br />

D4 LPE-4040 D11 LPE-4110 D19 LPE-4190<br />

D5 LPE-4050 D12 LPE-4120 D22 LPE-4220<br />

D6 LPE-4060 D13 LPE-4130 D23 LPE-4230<br />

D7 LPE-4070 D14 LPE-4140 D24 LPE-4240<br />

2.7 CURRENT LOOP ISOLATORS<br />

A.<br />

Current isolators shall accept an input of 4-20 mA DC and produce a linearly<br />

proportional 4-20 mA DC output signal. Accuracy shall be ±0.1% of scale. Isolators<br />

shall operate on 115 VAC, 60 Hz. Output load capability shall be a minimum of 1500<br />

ohms. Current isolators shall be Acromag Model 816 or approved equal.<br />

May 18, 2012<br />

Instrumentation<br />

Revision 0 40 90 01- 8

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