Instruction manual

3700R/3740 Refrigerated Sampler

Section 3 Programming Guidelines

3-64

Figure 3-13 Simplified Start Time Diagram

The start time for a routine is either the programmed start time

or the time at which the delay-to-start time expires. The pro-

grammed start time is determined by entries made in Displays

#90, #91, #92, and #93. The delay-to-start time is determined by

the entry in Display #310 of the Start Time Delay configure

option. These input displays are shown in Table 3-6 and in the

charts in Figures 3-8, 3-10, 3-11, and 3-12.

Note

Unless the sampling routine contains a programmed start time

(Displays #91, #92, or #93), the sampler will delay the start

time according to the amount of time specified in the Start

Time Delay configure option. A programmed start time entry

always overrides any settings made in the Start Time Delay

configure option.

Teledyne Isco 4200 Series Flow Meters and 4100 Series Flow

Loggers provide two essential functions for certain sampling

applications. They send flow-pacing signals — flow pulses — to

the sampler for flow-paced sampling. The second function pro-

vides disable (inhibit) or enable signals to the sampler. A sampler

receiving a disable signal will suspend the sampling routine until

it receives an enable signal.

The sampler will disregard a disable signal it receives from a

flow meter during the delay-to-start time. If the sampler is dis-

abled when the start time occurs, it will suspend the routine

until it is enabled. Once enabled, the sampler will begin the time

or flow intervals. The sampler will initiate a sample event when

enabled for all time-paced routines. For flow-paced routines, it

will initiate a sample event when the sampler is configured to

take a sample-upon-enable in the Enable Pin configure option.

START

SAMPLIN

Delay to

Start Time

Determined

by start time

entry or,start

time delay

Sampling

Routine

START

TIME