28 Jan 99: changed the liquid flow sensors. This used to be 1 flow sensor, producing only 1 trip point. Changed to 2 sensors, providing 1 trip point and 1 analog out each.
19 July 99: The previous version was for 1/2 MVD in the full-scale mockup. I have now included all sensors on both halves, plus the chiller water sensors, and components for a third half-system to be available in the BNL clean room. 1 Feb 2000: The distribution boards got built; this fixed the pin assignments for the Relay Board.

There are a number of sensors around the MVD cooling systems.

For the whole system, that is 2 MVD halves plus sensors aroung the chillers we have:

All 114 channels are carried to the sensor distribution boards, but only a subset of those will be read out, and an overlapping subset will be used to switch the relay boards.

The 4.65 number coms from looking up the longest cable run from the motherboard to the rack, and subtracting 1m. In addition, we need 2 short 34-pin ribbons to go from the distribution board to the ADC module, and one short 40-pin ribbon from the distribution board to the relay board.

The sensor cables arrive at the ancillary crate, where some of the signals need to be routed to the relay board, and some to the custom ADC module. In addition, the sensor cables are also used to carry power from the crate to the field sensors. To route the signals and power in a well-organized, reconfigurable fashion, we need sensor distribution boards, as shown here:

Postscript version

Sensor Distribution Boards
These are the 'sensor distribution modules', two identical double-wide 6U VME board, with front panel assignment as indicated. The sensor names (Tx, Fx, Hx) correspond to the nomenclature on this schematic of the cooling systems. postscript version -> All the details of the distribution boards are here.

Parts list for distribution boards

This is on the assumption that we'll have 2 boards + 1 spare:

table III
part	quantity	we have	need	comments
14-pin RH	6	-	6	makes 1 condo
14-pin straight	6	14	-
10-pin RH	18	-	18	makes 1 condo
10-pin straight	18	-	18
32-pin RH	3	-	3	makes 1 condo
32-pin straight	3	-	3
40-pin RH	3+18	1	20
VME backplane	6	lots	-

---

Field Sensors

Here is the schematic of the little [TxFx] sensor board, in gif or postscript. This sensor combination sits in the airflow.
Here is the ADT14 chip and the TMP12 chip pinouts.

			to ADC?	to relay?
Pin assignment for the [TxFx] sensors:	1	power	-	-
	2	ground	-	-
	3	power	-	-
	4	ground	-	-
	5	power	-	-
	6	ground	-	-
	7	low-low temperature trip	-	-
	8	low T trip	-	-
	9	high T trip	x	-
	10	high-high T trip	x	x
	11	analog temperature	x	-
	12	-	-	-
	13	low flow trip	x	-
	14	high flow trip	x	x

Here is the schematic of the little [Tx] sensor board, in gif or postscript. These sit on short copper sections in the liquid circuits.

			to ADC?	to relay?
Pin assignment for the [Tx] sensors:	1	power
	2	ground	-	-
	3	low-low temperature trip	-	-
	4	low T trip	-	-
	5	high T trip	x	-
	6	high-high T trip	x	x
	7	analog temperature	x	-
	8	-	-	-
	9	-	-	-
	10	-	-	-

Here is the schematic of the little [Fx] sensor board, in gif or postscript.

			to ADC?	to relay?
Pin assignment for the [Fx] sensors:	1	power	-	-
	2	ground	-	-
	3	low flow trip	x	x
	4	analog out	x	-
	5-10	NC	-	-

			to ADC?	to relay?
Pin assignment for the [Hx] sensor:
	1	power	-	-
	2	ground	-	-
	3	analog humidity	x	-
	4-10	NC	-	-

			to ADC?	to relay?
Pin assignment for the [Lx] sensor:
	1	power	-	-
	2	ground	-	-
	3	analog liquid level	x	-
	4-10	NC	-	-

Parts list for field sensors

For the '# of sets' (one set per MVD half) I assume we need to be able to provide services for 3 MVD halves (2 in the hall and 1 in the BNL cleantent), plus spares.

table V
part	quantity	we have	need	comments
ADT14	19	3	16
TMP12	11	7	4
Omega-HX49	4	1?	3?	bad hum sensor
Omega-LV170	4	1	3
Omega-xxx	4	1	3
R 10K	162	1000	-
R 100K	4	1000	-
R 200K	4	1000	-
pot 50K	70	22	48	can recover a few
pot 100K	70	2	68	can recover a few
pot 500K	22	4	18	can recover a few
14-pin conn	11	12	-
10-pin conn	36	20	16
testpoints	162	1000	-
16-pin socket	35	14	21
8-pin socket	11	-	11

ADC channels
The ADC channels are in the table below. The order follows that of the sensor distribution boards. Since there are only 32 channels per side available, not all of the channels are read out - non-essential ones are dropped. A netlist is here.

The relay board channel assignment is as follows:

1	T1	air
2	F1
3	T2
4	F2
5	T3
6	F3
7	T4	liquid
8	T5
9	F4
10	F5